Limestone
The three categories of sedimentary rocks are clastic, chemical, and organic. Clastic rocks form from the accumulation of weathered rock fragments, chemical rocks form from the precipitation of minerals from water, and organic rocks form from the remains of living organisms.
Organic sedimentary rock is comprised of the remains of once living organisms.
Fossils are most commonly found in sedimentary rocks. These rocks form from the accumulation and cementation of sediment, which helps preserve the remains of organisms over time. Sedimentary rocks often provide the ideal conditions for the formation and preservation of fossils.
A rock formed from living organisms is called a biogenic rock or organic rock. These rocks are formed from the accumulation of organic material, such as shells, coral, or plant debris, that undergoes processes like compaction and cementation to become solid rock over time. Examples include limestone, coal, and chalk.
Organic sedimentary rocks are made up of once living organisms. Examples include limestone, chalk, and coal, which form from the accumulation and compaction of organic remains like shells, coral, and plant material. These rocks preserve clues about ancient environments and life forms.
The type of rock that forms where the remains of plants and animals are deposited in thick layers are called organic sedimentary rock.
Organic sedimentary rocks, such as coal and some types of shale, form from the buildup and compression of plant material over time. These rocks are primarily composed of remains of plants and organic material.
The remains in question are the shells, as a source of calcium carbonate derived originally by the animal from solution in the sea-water..
You are likely to find fossils in sedimentary rocks, such as limestone, shale, and sandstone. These rocks form from the accumulation and compression of sediment layers over time, which can help preserve the remains of organisms within them.
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The cemented shells of marine organisms form limestone, which is a type of sedimentary rock. Limestone is predominantly composed of the mineral calcite and can contain fossilized remains of shells and other marine organisms.
Sedimentary rock is the most likely type of rock to contain fossils of animals that once lived in the ocean. This is because sedimentary rocks form from the accumulation and compaction of sediments, which can entomb and preserve the remains of organisms over time.