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The lowest stratum of rock is where the soft-bodied animal is most likely to be discovered. Because it forms first, the lowest layer of rock is oldest. The layer on top is the youngest , and each layer above that is younger.
Strata, the plural of the Latin term stratum, and is another name for rock layers, and stratigraphy is the study of strata.
When soil and other elements on the Earth's surface are eroded and eventually settle down, forming one layer of sediments, sedimentary rocks begin to form. New and more materials are degraded and deposit on the earlier layers as time goes on. Layer after layer is created as a result.
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