Geology 100 Sedimentary Rocks

Chert is a fine-grained sedimentary rock made up of silica that typically has a conchoidal fracture. It is often found as nodules in limestone formations and is commonly used for arrowheads and other tools by ancient civilizations.

Shale is a type of sedimentary rock that is characterized by its layered structure, hardness, and lack of visible grains.

Ultra mafic hard layered black coal is a type of coal characterized by its high carbon content and distinct black color. It is formed from layers of plant material that have been buried and compressed over millions of years.

Coquina is a type of sedimentary rock composed mainly of fragmented shell debris or coral. This rock gets its name from the Spanish word for 'cockle' or 'shellfish.'

Conglomerate is a type of sedimentary rock made up of large pieces of rock fragments that are bigger than one centimeter in size. It is different from other types of rocks such as crushed rocks, igneous rocks, and fine-grained sedimentary rocks.

SANDSTONE is a type of sedimentary rock that is characterized by its grainy texture, with grains larger than a grain of salt. It often contains a mix of black and white grains, along with detrital orange feldspar.

Silt is defined as a grain size in the silt range, typically finer than sand but coarser than clay. It is commonly found in sedimentary environments.