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Lithostratigraphic, biostratigraphic, and chronostratigraphic classifications are methods used to organize and interpret the rock and fossil records, and to understand the geologic history of the Earth.

Lithostratigraphic classification is based on rock type, mineral content, and other physical and chemical characteristics. This method is used to define and distinguish rock formations, and to assign them to specific stratigraphic units. Lithostratigraphic units are typically named after the geographic location where they were first described, and are usually assigned to a specific rock type such as sandstone, shale, or limestone. The rock formations that make up a lithostratigraphic unit are usually similar in age, composition, and depositional environment, and can be traced over large distances.

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