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Organic Sedimentary Rocks are formed from remains of plants and animals.
FOSSILS
Chemically formed sedimentary rocks are formed from dead remains of plants and animals that is from an organic sediment.
Because when the lava killed the animals, their remains stayed in the lava and dried to become sedimentary rock.
shells, bones and fossils
organic sedimentary
Such remains are known as fossils if the sediment is changed over eons into a sedimentary rock.
The type of rock that forms where the remains of plants and animals are deposited in thick layers are called organic sedimentary rock.
Saprobe
Skeletal remains of many sea creatures settle on the ocean floor. Here they mix with sediments and eventually become sedimentary rock.
Clastic sedimentary rock forms when fragments of preexisting rocks are compacted or cemented together. Organic sedimentary rock forms from the remains of plants or animals. Chemical sedimentary rock forms when minerals precipitate from a solution or settle from a suspension.
Organic sedimentary rock is comprised of the remains of once living organisms.