![]() They often form in deep water where clastic sediments from streams and beach action do not dominate the sedimentation. However, if the accumulating organic debris comes from diatoms and radiolarians, the ooze will consist mainly of silica, and the rock type that forms will be diatomite.Įxtensive deposits of chalk are found in many parts of the world. If most of the accumulating organic debris consists of calcium carbonate, then chalk will be the type of rock that forms from the ooze. ![]() When foraminifera, marine algae, or other organisms living on the bottom or in the waters above die, their remains sink to the bottom and accumulate as ooze. How Does Chalk Form?Ĭhalk forms from a fine-grained marine sediment known as ooze. Images by the United States Geological Survey. The calcium carbonate shells from organisms like these can accumulate to form chalk. Clockwise from top left:Įlphidium incertum, Elphidium excavatum clavatum, Trochammina squamata, Buccella frigida, Eggerella advena, and Ammonia beccarii. ![]() Benthic Foraminifera: Scanning electron microscope views of six different benthic foraminifera.
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