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The states' militia continued service, notably, in the slave-holding states, to maintain public order by performing slave patrols to round up fugitive slaves.

Responding to criticisms of failures of the militia, Adjutant General William Sumner wrote an analysis and rebuttal in a letter to John Adams, May 3, 1823:

The disasters of the militia may be ascribed chiefly, to two causes, of which the failure to train the men is a principle one; but, the omission to train the officers is as so much greater, that I think the history of its conduct, where it has been unfortunate, will prove that its defects are attributable, more to their want of knowledge or the best mode of applying the force under their authority to their attainment of their object than to all others. It may almost be stated, as an axiom, that the larger the body of undisciplined men is, the less is its chance of success; ...

During this inter-war period of the nineteenth century, the states' militia tended towards being disorderly and unprepared.

The demoralizing influences even of our own militia drills has long been notorious to a proverb. It has been a source of general corruptions to the community, and formed habits of idleness, dissipation and profligacy ... musterfields have generally been scenes or occasions of gambling, licentiousness, and almost every vice. ... An eye-witness of a New England training, so late as 1845, says, "beastly drunkenness, and other immoralities, were enough to make good men shudder at the very name of a muster".

Joseph Story laments in 1842 how the militia has fallen into serious decline:

And yet, though this truth would seem so clear, and the importance of a well regulated militia would seem so undeniable, it cannot be disguised, that among the American people there is a growing indifference to any system of militia discipline, and a strong disposition, from a sense of its burdens, to be rid of all regulations. How it is practicable to keep the people duly armed without some organization, it is difficult to see. There is certainly no small danger, that indifference may lead to disgust, and disgust to contempt; and thus gradually undermine all the protection intended by this clause of our National Bill of Rights.

Due to rising tensions between Latter-day Saints and their Missourian neighbors, in 1838, General David R. Atchison, the commander of the state militia of Northwestern Missouri, ordered Samuel Bogart to "prevent, if possible, any invasion of Ray County by persons in arms whatever". Bogart, who had participated in former anti-Mormon vigilante groups, proceeded to disarm resident Latter-day Saints and forced them to leave the county. In response David W. Patten led the Caldwell County militia to rescue Latter-day Saint residents from what they believed was a "mob". The confrontation between these two county militias (Ray and Caldwell) became known as the Battle of Crooked River and is a primary cause for Governor Lilburn Boggs issuing Missouri Executive Order 44. This order, often called the "Extermination Order", told the commander of the Missouri State Militia, General John B. Clark, that, "The Mormons must be treated as enemies, and must be exterminated or driven from the state if necessary for the public pease—their outrages are beyond description." In the following days Missouri militia killed 17 Latter-day Saints at Haun's Mill, laid siege to Far West, Missouri and jailed Latter-day Saint church leaders, including Joseph Smith.

The Mormon militia, in 1857 and 1858, fought against US federal troops in the Utah War over control of government territory.

During the violent political confrontations in the Kansas Territory involving anti-slavery Free-Staters and pro-slavery "Border Ruffians" elements, the militia was called out to enforce order on several occasions, notably during the incidents referred to as the Wakarusa War.

During John Brown's raid on Harpers Ferry, local militia companies from villages within a 30-mile radius of Harpers Ferry cut off Brown's escape routes and trapped Brown's men in the armory.

At the beginning of the American Civil War, neither the North or the South was nearly well enough prepared for war, and few people imagined the demands and hardships the war would bring. Just prior to the war the total peacetime army consisted of a paltry 16,000 men. Both sides issued an immediate call to forces from the militia, followed by the immediate awareness of an acute shortage of weapons, uniforms, and trained officers. State militia regiments were of uneven quality, and none had anything resembling combat training. The typical militia drilling at the time amounted to, at best, parade-ground marching. The militia units, from local communities, had never drilled together as a larger regiment, and thus lacked the extremely important skill, critically necessary for the war style of the time, of maneuvering from a marching line into a fighting line. Yet both sides were equally unready, and rushed to prepare.

The most important:

Following the Confederate taking of Fort Sumter, which marked the beginning of the Civil War, President Lincoln called up 75,000 States' militiamen to retake the seized Federal property and found that the militia "strength was far short of what the Congressional statute provided and required".

In the summer of 1861, military camps circled around Washington, D.C. composed of new three-year army volunteers and 90-day militia units. The generals in charge of this gathering had never handled large bodies of men before, and the men were simply inexperienced civilians with arms having little discipline and less understanding of the importance of discipline.

In the West, Union state and territorial militias existed as active forces in defense of settlers there. California especially had many active militia companies at the beginning of the war that rose in number until the end of the war. It would also provide the most Volunteers from west of the Rocky Mountains: eight regiments and two battalions of infantry, two regiments and a battalion of cavalry. It also provided most of the men for the infantry regiment from Washington Territory. Oregon raised an infantry and a cavalry regiment. Colorado Territory militias were organized both to resist the Confederacy and any civil disorder caused by secessionists, Copperheads, Mormons, or most particularly the Native tribes. The Colorado Volunteers participated in the Battle of Glorieta Pass turning back a Confederate invasion of New Mexico Territory. Later they initiated the Colorado War with the Plains Indians and committed the Sand Creek massacre. The California Volunteers of the California Column were sent east across the southern deserts to drive the Confederates out of southern Arizona, New Mexico and west Texas around El Paso, then fought the Navajo and Apache until 1866. They also were sent to guard the Overland Trail, keep the Mormons under observation by the establishment of Fort Douglas in Salt Lake City, and fought a campaign against the Shoshone culminating in the Battle of Bear River. In Nevada, Oregon and Idaho Territory, California, Oregon and Washington Territorial Volunteers tried to protect the settlers and pacified tribes from each other and they fought the Goshute, Paiute, Ute and hostile Snake Indians in the Snake War from 1864 until 1866. In California, volunteer forces fought the Bald Hills War in the northwestern forests until 1864 and also the Owens Valley Indian War in 1862–1863.

With passage of federal reconstruction laws between 1866 and 1870 the U.S. Army took control of the former rebel states and ordered elections to be held. These elections were the first in which African Americans could vote. Each state (except Virginia) elected Republican governments, which organized militia units. The majority of militiamen were black. Racial tension and conflict, sometimes intense, existed between the Negro freedmen and the ex-Confederate whites.

In parts of the South, white paramilitary groups and rifle clubs formed to counter this black militia, despite the laws prohibiting drilling, organizing, or parading except for duly authorized militia. These groups engaged in a prolonged series of retaliatory, vengeful, and hostile acts against this black militia.

The activity of the official black militia, and the unofficial illegal white rifle clubs, typically peaked in the autumn surrounding elections. This was the case in the race riot of Clinton, Mississippi in September 1875, and the following month in Jackson, Mississippi. An eyewitness account:

I found the town in great excitement; un-uniformed militia were parading the streets, both white and colored. I found that the white people—democrats—were very much excited in consequence of the governor organizing the militia force of the state. ... I found that these people were determined to resist his marching the militia (to Clinton) with arms, and they threatened to kill his militiamen.

Outright war between the state militia and the white rifle clubs was avoided only by the complete surrender of one of the belligerents, though tensions escalated in the following months leading to a December riot in Vicksburg, Mississippi resulting in the deaths of two whites and thirty-five black people. Reaction to this riot was mixed, with the local Democrats upset at the influx of federal troops that followed, and the Northern press expressing outrage: "Once more, as always, it is the Negroes that are slaughtered while the whites escape."

Enacted in the wake of the Civil War, the Federal Congress passed the Posse Comitatus Act intended to prohibit federal troops and militia from supervising elections. This act substantially limits the powers of the Federal government to use the military serving on active duty under Title 10 for law enforcement, but does not preclude governors from using the National Guard in a law enforcement role as long as the guardsmen are serving under Title 32 or on state active duty.

Despite a lack of initial readiness, training, and supplies, the Militas of the United States fought and achieved victory in the Spanish–American War.

In 1914, in Ludlow, Colorado, the militia was called out to calm the situation during a coal mine strike, but the sympathies of the militia leaders allied with company management and resulted in the deaths of roughly 19 to 25 people.

The state National Guard was originally called out, but the company was allowed to organize an additional private militia consisting of Colorado Fuel & Iron Company (CF&I) guards in National Guard uniforms augmented by non-uniformed mine guards.

The Ludlow massacre was an attack by the Colorado National Guard and Colorado Fuel & Iron Company camp guards on a tent colony of 1,200 striking coal miners and their families at Ludlow, Colorado on April 20, 1914.

In retaliation for Ludlow, the miners armed themselves and attacked dozens of mines over the next ten days, destroying property and engaging in several skirmishes with the Colorado National Guard along a 40-mile front from Trinidad to Walsenburg. The entire strike would cost between 69 and 199 lives. Thomas Franklin Andrews described it as the "deadliest strike in the history of the United States".

American organized and unorganized militias fought in the Mexican Revolution. Some campaigned in Mexico as insurgent forces and others fought in battles such as Ambos Nogales and Columbus in defense of the interests of United States.

The Plattsburg Movement. The Hays Law.

Each state has two mandatory forces, namely the Army National Guard and the Air National Guard. Many states also have state defense forces and a naval militia, which assist, support and augment National Guard forces.

The National Guard (or National Guard of a State) differs from the National Guard of the United States; however, the two do go hand-in-hand.

The National Guard is a militia force organized by each of the states and territories of the United States. Established under Title 10 and Title 32 of the U.S. Code, the state National Guard serves as part of the first-line defense for the United States. The state National Guard is divided up into units stationed in each of the 50 states and the U.S. territories and operates under their respective state governor or territorial government. The National Guard may be called up for active duty by the state governors or territorial commanding generals to help respond to domestic emergencies and disasters, such as those caused by hurricanes, floods, and earthquakes.

The National Guard of the United States is a military reserve force composed of state National Guard members or units under federally recognized active or inactive armed force service for the United States. Created by the 1933 amendments to the National Defense Act of 1916, the National Guard of the United States is a joint reserve component of the United States Army and the United States Air Force. The National Guard of the United States maintains two subcomponents: the Army National Guard of the United States for the Army and the Air Force's Air National Guard of the United States.

The current United States Code, Title 10 (Armed forces), section 246 (Militia: Composition and Classes), paragraph (a) states: "The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard." Section 313 of Title 32 refers to persons with prior military experience. ("Sec. 313. Appointments and enlistments: age limitation

These persons remain members of the militia until age 64. Paragraph (b) further states, "The classes of the militia are: (1) the organized militia, which consists of the National Guard and the Naval Militia; and (2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia."

The National Guard of the United States is the largest of the organized federal reserve military forces in the United States. The National Guard of the United States is classified (under title 10, United States Code (see above)) as the organized federal reserve military force. Under federal control, the National Guard of the United States can be called up for active duty by the President of the United States. Since the 2003 invasion of Iraq, many National Guard units have served overseas – under the Total Force Policy of 1973 which effectively combined the National Guard with the armed forces, making them regular troops. This can lead to problems for states that also face internal emergencies while the Guard is deployed overseas. To address such issues, many of the states, such as New York and Maryland also have organized state "militia" forces or state guards which are under the control of the governor of a state; however, many of these "militia" also act as a reserve for the National Guard and are thus a part of it (this varies from state to state depending on individual state statutory laws). New York and Ohio also have active naval militias, and a few other states have on-call or proposed ones. In 1990, the United States Supreme Court ruled in the case of "Perpich v. Department of Defense" that the federal government has plenary power over the National Guard, greatly reducing (to the point of nonexistence) the state government's ability to withhold consent to federal deployments and training missions of the National Guard.

Since the Militia Act of 1903, many states have created and maintained a reserve military force known as state defense forces (Some states refer to them as state military reserve, state guard, or foot guard). They were created to assist, support and augment National Guard forces during peacetime conditions. Also during the call up of National Guard forces for wartime deployments, state defense forces can be used to assume the full military responsibilities of the state. Their mission includes the defense of the state and the enforcement of military orders when ordered by their Governor.

Throughout the 20th century, state defense forces were used in every major war. New York Guard Soldiers patrolled and secured the water aqueduct of New York, mass transit areas, and were even deployed to France to assist in logistical operations in World War I. The Texas State Guard's soldiers suppressed a riot and maintained peace and order in Texas throughout World War II.

Today state defense forces continue to assist, support and augment the National Guard of the state. They provide logistical, administration, medical, transportation, security, and ceremonial assistance. Some states have provided additional support such as the New York State Defense Force (New York Guard) providing its Soldiers to help support and augment the National Guard CERFP Team. The California State Military Reserve provides the National Guard with Soldiers to assist with military police training and the Alaska State Defense Force constantly provides armed military police troops to assist with the security of Alaska. One of the major roles of the Mississippi State Guard is providing operational support during natural disasters such as hurricanes relief operations.

One militia in the United States has modeled themselves after the state defense forces on a national level. They are known as the United States National Defense Corps.

All able bodied men, 17 to 45 of age, are ultimately eligible to be called up into military service and belong to the class known as the reserve militia, also known as the unorganized militia (10 USC). Able bodied men who are not eligible for inclusion in the reserve militia pool are those aliens not having declared their intent to become citizens of the United States (10 USC 246) and former regular component veterans of the armed forces who have reached the age of 64 (32 USC 313). All female citizens who are members of National Guard units are also included in the reserve militia pool ().

Other persons who are exempt from call to duty () and are not therefore in the reserve militia pool include:

Many individual states have additional statutes describing their residents as part of the state militia; for example Washington law specifies all able-bodied citizens or intended citizens over the age of eighteen as members of the state militia, as explicitly distinct from the National Guard and Washington State Guard.

Within the United States, since approximately 1992, there have been a number of private organizations that call themselves militia or unorganized militia.

In states such as Texas, the state constitution classifies male citizens between the ages of 17 and 45 to belong to the "Unorganized Reserve Militia". The Texas constitution also grants the county sheriff and the governor of the state the authority to call upon the unorganized reserve militia to uphold the peace, repel invasion, and suppress rebellion, similar to the early "Texas Rangers".

= = = Meropeidae = = =

Meropeidae is a family of tiny scorpionflies within the order Mecoptera with only three living species, commonly referred to as "earwigflies" (or sometimes "forcepflies"). These include the North American "Merope tuber", the Western Australian "Austromerope poultoni", and the newly discovered South American "A. brasiliensis". The biology of these species is essentially unknown, and their larvae have never been seen. The disjunct distribution suggests a common origin before the breakup of the ancient supercontinent of Pangaea. There are two undisputed extinct genera, "Boreomerope antiqua" known from an isolated wing found in the Middle Jurassic Itat Formation of Siberia and "Burmomerope" with two species from the Cenomanian aged Burmese amber. As such, the extant members of this family can be considered living fossils. These insects are also of interest due to their presumed basal position in the order Mecoptera. "Thaumatomerope" with four described species all from the Madygen Formation in Kyrgyzstan has historically sometimes been included within the family, "Thaumatomerope" is sometimes excluded from Meropeidae, and instead, is placed within Eomeropidae, or its own monotypic family, "Thaumatomeropidae."*

The family name was spelt "Meropidae" in old literature but this clashes with the homonymous family name in birds for bee-eaters. The spelling of Meropeidae was adopted for the insect family by the ICZN in Opinion 140 of 1943.

= = = Clastic rock = = =

Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus, chunks and smaller grains of rock broken off other rocks by physical weathering. Geologists use the term clastic with reference to sedimentary rocks as well as to particles in sediment transport whether in suspension or as bed load, and in sediment deposits.

Clastic sedimentary rocks are rocks composed predominantly of broken pieces or "clasts" of older weathered and eroded rocks. Clastic sediments or sedimentary rocks are classified based on grain size, clast and cementing material (matrix) composition, and texture. The classification factors are often useful in determining a sample's environment of deposition. An example of clastic environment would be a river system in which the full range of grains being transported by the moving water consist of pieces eroded from solid rock upstream.

Grain size varies from clay in shales and claystones; through silt in siltstones; sand in sandstones; and gravel, cobble, to boulder sized fragments in conglomerates and breccias. The Krumbein phi (φ) scale numerically orders these terms in a logarithmic size scale.

"Siliciclastic" rocks are clastic noncarbonate rocks that are composed almost exclusively of silicon, either as forms of quartz or as silicates.

The composition of siliciclastic sedimentary rocks includes the chemical and mineralogical components of the framework as well as the cementing material that make up these rocks. Boggs divides them into four categories; major minerals, accessory minerals, rock fragments, and chemical sediments.

Major minerals can be categorized into subdivisions based on their resistance to chemical decomposition. Those that possess a great resistance to decomposition are categorized as stable, while those that do not are considered less stable. The most common stable mineral in siliciclastic sedimentary rocks is quartz (SiO). Quartz makes up approximately 65 percent of framework grains present in sandstones and about 30 percent of minerals in the average shale. Less stable minerals present in this type of rocks are feldspars, including both potassium and plagioclase feldspars. Feldspars comprise a considerably lesser portion of framework grains and minerals. They only make up about 15 percent of framework grains in sandstones and 5% of minerals in shales. Clay mineral groups are mostly present in mudrocks (comprising more than 60% of the minerals) but can be found in other siliciclastic sedimentary rocks at considerably lower levels.

Accessory minerals are associated with those whose presence in the rock are not directly important to the classification of the specimen. These generally occur in smaller amounts in comparison to the quartz, and feldspars. Furthermore, those that do occur are generally heavy minerals or coarse grained micas (both Muscovite and Biotite).

Rock fragments also occur in the composition of siliciclastic sedimentary rocks and are responsible for about 10–15 percent of the composition of sandstone. They generally make up most of the gravel size particles in conglomerates but contribute only a very small amount to the composition of mudrocks. Though they sometimes are, rock fragments are not always sedimentary in origin. They can also be metamorphic or igneous.

Chemical cements vary in abundance but are predominantly found in sandstones. The two major types are silicate based and carbonate based. The majority of silica cements are composed of quartz, but can include chert, opal, feldspars and zeolites.

Composition includes the chemical and mineralogic make-up of the single or varied fragments and the cementing material (matrix) holding the clasts together as a rock. These differences are most commonly used in the framework grains of sandstones. Sandstones rich in quartz are called quartz arenites, those rich in feldspar are called arkoses, and those rich in lithics are called lithic sandstones.

Siliciclastic sedimentary rocks are composed of mainly silicate particles derived from the weathering of older rocks and pyroclastic volcanism. While grain size, clast and cementing material (matrix) composition, and texture are important factors when regarding composition, siliciclastic sedimentary rocks are classified according to grain size into three major categories: conglomerates, sandstones, and mudrocks. The term "clay" is used to classify particles smaller than .0039 millimeters. However, the term can also be used to refer to a family of sheet silicate minerals. "Silt" refers to particles that have a diameter between .062 and .0039 millimeters. The term "mud" is used when clay and silt particles are mixed in the sediment; "mudrock" is the name of the rock created with these sediments. Furthermore, particles that reach diameters between .062 and 2 millimeters fall into the category of sand. When sand is cemented together and lithified it becomes known as sandstone. Any particle that is larger than two millimeters is considered gravel. This category includes pebbles, cobbles and boulders. Like sandstone, when gravels are lithified they are considered conglomerates.

Conglomerates are coarse grained rocks dominantly composed of gravel sized particles that are typically held together by a finer grained matrix. These rocks are often subdivided into conglomerates and breccias. The major characteristic that divides these two categories is the amount of rounding. The gravel sized particles that make up conglomerates are well rounded while in breccias they are angular. Conglomerates are common in stratigraphic successions of most, if not all, ages but only make up one percent or less, by weight, of the total sedimentary rock mass. In terms of origin and depositional mechanisms they are very similar to sandstones. As a result, the two categories often contain the same sedimentary structures.

Sandstones are medium-grained rocks composed of rounded or angular fragments of sand size, that often but not always have a cement uniting them together. These sand-size particles are often quartz but there are a few common categories and a wide variety of classification schemes that classify sandstones based on composition. Classification schemes vary widely, but most geologists have adopted the Dott scheme, which uses the relative abundance of quartz, feldspar, and lithic framework grains and the abundance of muddy matrix between these larger grains.

Rocks that are classified as mudrocks are very fine grained. Silt and clay represent at least 50% of the material that mudrocks are composed of. Classification schemes for mudrocks tend to vary, but most are based on the grain size of the major constituents. In mudrocks, these are generally silt, and clay.

According to Blatt, Middleton and Murray mudrocks that are composed mainly of silt particles are classified as siltstones. In turn, rocks that possess clay as the majority particle are called claystones. In geology, a mixture of both silt and clay is called mud. Rocks that possess large amounts of both clay and silt are called mudstones. In some cases the term shale is also used to refer to mudrocks and is still widely accepted by most. However, others have used the term shale to further divide mudrocks based on the percentage of clay constituents. The plate-like shape of clay allows its particles to stack up one on top of another, creating laminae or beds. The more clay present in a given specimen, the more laminated a rock is. Shale, in this case, is reserved for mudrocks that are laminated, while mudstone refers those that are not.

Siliciclastic rocks initially form as loosely packed sediment deposits including gravels, sands, and muds. The process of turning loose sediment into hard sedimentary rocks is called lithification. During the process of lithification, sediments undergo physical, chemical and mineralogical changes before becoming rock. The primary physical process in lithification is compaction. As sediment transport and deposition continues, new sediments are deposited atop previously deposited beds, burying them. Burial continues and the weight of overlying sediments causes an increase in temperature and pressure. This increase in temperature and pressure causes loose grained sediments become tightly packed, reducing porosity, essentially squeezing water out of the sediment. Porosity is further reduced by the precipitation of minerals into the remaining pore spaces. The final stage in the process is diagenesis and will be discussed in detail below.

Cementation is the diagenetic process by which coarse clastic sediments become lithified or consolidated into hard, compact rocks, usually through the deposition or precipitation of minerals in the spaces between the individual grains of sediment. Cementation can occur simultaneously with deposition or at another time. Furthermore, once a sediment is deposited, it becomes subject to cementation through the various stages of diagenesis discussed below.

Eogenesis refers to the early stages of diagenesis. This can take place at very shallow depths, ranging from a few meters to tens of meters below the surface. The changes that occur during this diagenetic phase mainly relate to the reworking of the sediments. Compaction and grain repacking, bioturbation, as well as mineralogical changes all occur at varying degrees. Due to the shallow depths, sediments undergo only minor compaction and grain rearrangement during this stage. Organisms rework sediment near the depositional interface by burrowing, crawling, and in some cases sediment ingestion. This process can destroy sedimentary structures that were present upon deposition of the sediment. Structures such as lamination will give way to new structures associated with the activity of organisms. Despite being close to the surface, eogenesis does provide conditions for important mineralogical changes to occur. This mainly involves the precipitation of new minerals.

Mineralogical changes that occur during eogenesis are dependent on the environment in which that sediment has been deposited. For example, the formation of pyrite is characteristic of reducing conditions in marine environments. Pyrite can form as cement, or replace organic materials, such as wood fragments. Other important reactions include the formation of chlorite, glauconite, illite and iron oxide (if oxygenated pore water is present). The precipitation of potassium feldspar, quartz overgrowths, and carbonate cements also occurs under marine conditions. In non marine environments oxidizing conditions are almost always prevalent, meaning iron oxides are commonly produced along with kaolin group clay minerals. The precipitation of quartz and calcite cements may also occur in non marine conditions.

As sediments are buried deeper, load pressures become greater resulting in tight grain packing and bed thinning. This causes increased pressure between grains thus increasing the solubility of grains. As a result, the partial dissolution of silicate grains occurs. This is called pressure solutions. Chemically speaking, increases in temperature can also cause chemical reaction rates to increase. This increases the solubility of most common minerals (aside from evaporites). Furthermore, beds thin and porosity decreases allowing cementation to occur by the precipitation of silica or carbonate cements into remaining pore space.

In this process minerals crystallize from watery solutions that percolate through the pores between grain of sediment. The cement that is produced may or may not have the same chemical composition as the sediment. In sandstones, framework grains are often cemented by silica or carbonate. The extent of cementation is dependent on the composition of the sediment. For example, in lithic sandstones, cementation is less extensive because pore space between framework grains is filled with a muddy matrix that leaves little space for precipitation to occur. This is often the case for mudrocks as well. As a result of compaction, the clayey sediments comprising mudrocks are relatively impermeable.

Dissolution of framework silicate grains and previously formed carbonate cement may occur during deep burial. Conditions that encourage this are essentially opposite of those required for cementation. Rock fragments and silicate minerals of low stability, such as plagioclase feldspar, pyroxenes, and amphiboles, may dissolve as a result of increasing burial temperatures and the presence of organic acids in pore waters. The dissolution of frame work grains and cements increases porosity particularly in sandstones.

This refers to the process whereby one mineral is dissolved and a new mineral fills the space via precipitation. Replacement can be partial or complete. Complete replacement destroys the identity of the original minerals or rock fragments giving a biased view of the original mineralogy of the rock/ Porosity can also be affected by this process. For example, clay minerals tend to fill up pore space and thereby reducing porosity.

In the process of burial, it is possible that siliciclastic deposits may subsequently be uplifted as a result of a mountain building event or erosion. When uplift occurs, it exposes buried deposits to a radically new environment. Because the process brings material to or closer to the surface, sediments that undergo uplift are subjected to lower temperatures and pressures as well as slightly acidic rain water. Under these conditions, framework grains and cement are again subjected to dissolution and in turn increasing porosity. On the other hand, telogenesis can also change framework grains to clays, thus reducing porosity. These changes are dependent on the specific conditions that the rock is exposed as well as the composition of the rock and pore waters. Specific pore waters, can cause the further precipitation of carbonate or silica cements. This process can also encourage the process of oxidation on a variety of iron bearing minerals.

Sedimentary breccias are a type of clastic sedimentary rock which are composed of angular to subangular, randomly oriented clasts of other sedimentary rocks. They may form either

In the field, it may at times be difficult to distinguish between a debris flow sedimentary breccia and a colluvial breccia, especially if one is working entirely from drilling information. Sedimentary breccias are an integral host rock for many sedimentary exhalative deposits.

Clastic igneous rocks include pyroclastic volcanic rocks such as tuff, agglomerate and intrusive breccias, as well as some marginal eutaxitic and taxitic intrusive morphologies. Igneous clastic rocks are broken by flow, injection or explosive disruption of solid or semi-solid igneous rocks or lavas.

Igneous clastic rocks can be divided into two classes:

Clastic metamorphic rocks include breccias formed in faults, as well as some protomylonite and pseudotachylite. Occasionally, metamorphic rocks can be brecciated via hydrothermal fluids, forming a hydrofracture breccia.

Hydrothermal clastic rocks are generally restricted to those formed by hydrofracture, the process by which hydrothermal circulation cracks and brecciates the wall rocks and fills it in with veins. This is particularly prominent in epithermal ore deposits and is associated with alteration zones around many intrusive rocks, especially granites. Many skarn and greisen deposits are associated with hydrothermal breccias.

A fairly rare form of clastic rock may form during meteorite impact. This is composed primarily of ejecta; clasts of country rock, melted rock fragments, tektites (glass ejected from the impact crater) and exotic fragments, including fragments derived from the impactor itself.

Identifying a clastic rock as an impact breccia requires recognising shatter cones, tektites, spherulites, and the morphology of an impact crater, as well as potentially recognizing particular chemical and trace element signatures, especially osmiridium.

= = = Asabiyyah = = =

ʿAsabiyya or asabiyyah (Arabic: عصبيّة) is a concept of social solidarity with an emphasis on unity, group consciousness and sense of shared purpose, and social cohesion, originally in a context of "tribalism" and "clanism". It was familiar in the pre-Islamic era, but became popularized in Ibn Khaldun's "Muqaddimah" where it is described as the fundamental bond of human society and the basic motive force of history, pure only in its nomadic form. ʿAsabiyya is neither necessarily nomadic nor based on blood relations; rather, it resembles philosophy of classical republicanism. In the modern period, it is generally analogous to solidarity. However, it is often negatively associated because it can sometimes suggest loyalty to one's group regardless of circumstances, or partisanship. Ibn Khaldun also argued that ʿasabiyya is cyclical and directly related to the rise and fall of civilizations: it is most strong at the start of a civilization, declines as the civilization advances, and then another more compelling ʿasabiyyah eventually takes its place to help establish a different civilization.

Ibn Khaldun describes "Asabiyyah" as the bond of cohesion among humans in a group forming community. The bond, Asabiyyah, exists at any level of civilization, from nomadic society to states and empires. Asabiyyah is most strong in the nomadic phase, and decreases as civilization advances. As this Asabiyyah declines, another more compelling Asabiyyah may take its place; thus, civilizations rise and fall, and history describes these cycles of Asabiyyah as they play out.

Ibn Khaldun argues that each dynasty (or civilization) has within itself the seeds of its own downfall. He explains that ruling houses tend to emerge on the peripheries of great empires and use the much stronger ʿasabiyya present in those areas to their advantage, in order to bring about a change in leadership. This implies that the new rulers are at first considered "barbarians" by comparison to the old ones. As they establish themselves at the center of their empire, they become increasingly lax, less coordinated, disciplined and watchful, and more concerned with maintaining their new power and lifestyle. The ʿasabiyya, dissolves into factionalism and individualism, diminishing their capacity as a political unit. Thus, conditions are created wherein a new dynasty can emerge at the periphery of their control, grow strong, and effect a change in leadership, beginning the cycle anew. Ibn Khaldun also further states in the "Muqaddimah" that "dynasties have a natural life span like individuals", and that no dynasty generally lasts beyond three generations of about 40 years each.

= = = Eleanor of Castile, Queen of Navarre = = =

Eleanor of Castile (after 1363 – 27 February 1416) was an infanta of Castile and the Queen consort of Navarre.

She was the daughter of King Henry II of Castile and his wife, Juana Manuel of Castile, from a cadet branch of the Castilian royal house. Eleanor was a member of the House of Trastámara.

Eleanor was subject to marriage plans with Ferdinand I of Portugal in 1371 however, the King refused the match as he had secretly married noblewoman Leonor Telles de Menezes.

A betrothal took place in 1373 in Burgos with Prince Charles, heir to his father Charles II of Navarre. The couple were married at Soria in May 1375. A testament dated at Burgos on 29 May 1374, shows that King Henry II bequeathed property to his daughter Eleanor as a part of her dowry.

However, the newly married royal couple went through certain marital disputes. In 1388, Eleanor asked at a meeting between her husband and her brother John I of Castile, for permission to retire for some time to her homeland of Castile, in order to recover from an illness in the local climate, which she had believed to be best for her health. She took her young daughters, whom she bore her husband during the first thirteen years of their marriage. Eleanor and her children resided in Valladolid and by 1390 she bore two more daughters to Charles. Two years later, she was demanded by her husband to return because they needed to be crowned King and Queen of Navarre as her father-in-law King Charles had died. Eleanor's brother King John supported the request of Charles III. Eleanor did not contend, claiming she was ill-treated in Navarre and believed members of the Navarrese nobility wished to poison her. As a result, Eleanor remained in Castile whilst her husband was crowned in February 1390 in Pamplona. By the end of the 1390s, Eleanor had given her husband six daughters, all surviving infancy but no sons and so for this reason, Eleanor handed her oldest daughter Joanna over to Charles III as she was heiress to the Kingdom.

0n 9 October 1390, Eleanor's brother John died and was succeeded by his minor son Henry. Charles then again requested Eleanor's return to Navarre however, she refused. Eleanor opposed her nephew's accession and she formed the League of Lillo along with her illegitimate half-brother Fadrique and her cousin Pedro. King Henry opposed the League, he besieged Eleanor in her castle at Roa around mid-1394 and obliged her to return to her husband in February 1395.