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Because coal and most limestones are formed from organic material (living things). Coal is formed from compressed plant material, and limestone from animal remains (hard parts: soft parts are almost always rotted, broken by force or consumed by predators). From here you get different kinds of coal, depending on how long and how deep they have been buried. Limestones vary according to their composition (through formation). 'Shelly limestone' is composed of shell, as the name suggests. Chalk is composed of coccoliths - minuscule shell of tiny sea creatures millions of years ago. These rocks are, therefore, fossils.

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Why are coal and rock limestone classified as organic sedimentary rocks?

The material comprising the rocks coal and limestone are derived from organisms. Therefore, they are classified as organic sedimentary rocks.


How can sedimentary rocks can be classified?

sedimentary rocks can be classified by detrial, chemical ,or organic


Is Kaibab an organic sedimentary rock?

Kaibab Limestone is not an organic sedimentary rock, but classified only as a sedimentary rock. Organic sedimentary rocks form from the remains of carbon rich plant life normally.


What are the names of the organic sedimentary rocks?

Examples of sedimentary rock include:BauxiteLimestoneDolostoneBrecciaConglomerateShaleMudstoneBituminous CoalSandstoneHaliteGypsumChalkCoquinaLateriteArkoseGraywackeClaystoneSiltstoneChert


What examples of a sedimentary rock are chalk and coal?

Chalk is a type of limestone. Limestone and coal are both organic sedimentary rocks.


What are a couple of examples of sedimentary rocks?

Rocks that are categorized as sedimentary rocks include sandstone, breccia shale, limestone and selenite. Sedimentary rocks are classified by their grain size.


What are examples of organic sedimentary rock?

Examples of organic sedimentary rocks include coal, which forms from the accumulation and compaction of plant remains, and limestone, which can contain organic debris such as shells and coral. Organic sedimentary rocks are derived from the remains of living organisms.


What are sedimentary rocks from living or once-living material called?

Sedimentary rocks formed from living or once-living material are called organic sedimentary rocks. Examples include limestone, coal, and chalk.


How are the three types of sedimentary rocks classiffied?

Sedimentary rocks are classified into three main types based on their formation processes: clastic, chemical, and organic. Clastic sedimentary rocks are formed from the accumulation and compaction of mineral and rock fragments, such as sandstone and shale. Chemical sedimentary rocks result from the precipitation of minerals from solution, exemplified by limestone and rock salt. Organic sedimentary rocks, like coal, form from the accumulation of plant or animal debris.


What kind of sedimentary rocks are crystalline limestone and chert classified as?

Crystalline limestone and chert are classified as biochemical sedimentary rocks. Crystalline limestone forms from the accumulation of calcite-rich remains of marine organisms, while chert forms from the silica-rich remains of marine organisms such as radiolarians or diatoms.


What sedimentary rocks are formed from the remains of plants and animals?

Sedimentary rocks formed from the remains of plants and animals are called organic sedimentary rocks. Examples include coal, formed from the remains of plants, and limestone, formed from the shells of marine organisms.


A marble is a sedimentary metamorphic or igneous?

Marble, the rock, is metamorphic. From limestone.