Lithostratigraphy is a sub-discipline of stratigraphy, the geological science associated with the study of strata or rock layers. Major focuses include geochronology, comparative geology, and petrology. In general a stratum will be primarily igneous or sedimentary relating to how the rock was formed. Sedimentary layers are laid down by deposition ...
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http://en.wikipedia.org/wiki/Lithostratigraphy
The classification of rock successions based on rock type (otherwise known as lithology).
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https://www.encyclo.co.uk/local/23001
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