The principle of faunal (or fossil) sucession was developed based on Geologist William Smith's observations of fossils found within sedimentary rocks.
Sedimentary rocks are formed from deposits of pre-present rocks or portions of as soon as-residing organisms that accumulate on the earth's floor. If sediment is buried deeply, it will become compacted and cemented, forming sedimentary rock.
Commonplace sedimentary rocks consist of sandstone, limestone, and shale. these rocks frequently begin as sediments carried in rivers and deposited in lakes and oceans. while buried, the sediments lose water and become cemented to shape rock. Tuffaceous sandstones include volcanic ash.
Sedimentary rocks are varieties of rock that are shaped with the aid of the accumulation or deposition of mineral or organic particles on Earth's floor, accompanied by means of cementation. Sedimentation is the collective call for approaches that cause this debris to settle in place.
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