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I think they're found in the fossils of dead animals or plants.
Sandstone. Sandstone is a sedimentary rock - which is the only type of rock which can contain fossils.
sedimentary
A fossil is evidence of an organisms existence, not a type of rock. Most fossils are found in sedimentary rocks.
1000 years
coal
igneous rock
Hydrocarbonous rock
Sedimentary Rock
Anthracite is metamorphosed bituminous coal and is a metamorphic rock.
sedimentary
no