Dunn-Seiler Museum: Sedimentary Rocks
Sedimentary Rocks: Clastic, Chemical, and Biogenic
Sedimentary rocks are formed when sediments (weathered pieces of rock, minerals, biologic materials, or dissolved ions) are cemented and compressed together, or when ions precipitate out of a solution. There are three classes of sedimentary rocks: Clastic (cemented and compressed sediments), Biogenic (cemented and compressed biological materials), and Chemical (precipitates or evaporites). Sedimentary rocks and sediments contain the vast majority of the world's fossils!
