Marl is a sediment or sedimentary rock that is a mixture of clay and calcite (CaCO3). Arkansas marls may also contain glauconite, sand, and marine shell deposits. Marl is used in the manufacture of cement and for agricultural purposes.
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Marl or marlstone is a sedimentary rock composed by limestone and clay. This photo was taken in Portitxol, Alacant province, Comunitat Valenciana Stock Photo - Alamy
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