Non-clastic rocks
Biochemical sedimentary rocks.
Biochemical sedimentary rocks.
Vegetation.
matrix
Organic sedimentary rocks like coal and some limestones, are composed of particles created by life processes. In the case of coal it is plant remains. With limestones, it is the shells and secretions of small marine organisms.
Coal is a rock derived from organic processes.
a rock formed by unconsolidated sediment deposited in layers
Matrix
no
Gasoline is a solution of organic compounds.
Oil is a homogeneous solution of organic compounds.
Chalk is one limestone formed from organic processes. There are others.