Biostratigraphic dating relies on

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While most properties are based on the number of protons in an element, isotopes can have subtle changes between them, including temperature fractionation and radioactivity.An atom that has different number of neutrons but the same number of protons.Lines correlating the strata with equivalent fossil content." width="228" height="167" srcset=" sizes="(max-width: 228px) 85vw, 228px"/The fossils found at any time are unique, and the fossils in layers of different ages have progressed and changed as time has moved forward.Fossils found in layers that are not as old have organisms that more resemble organisms that are alive today.strata are unique to the time they lived and can be used to correlate rocks of the same age across wide geographic distribution.The layers of rock lie on top of one another in order from oldest at the bottom to youngest on top based on the Principle of Superposition Sandstone.This layer is laterally continuous, even though the intervening canyon separates its outcrops on either side by about 18 miles.Evolution shows that the complexity of life has generally increased over time. Wikimedia Commons, via Wikimedia Commons' src=" alt="Photo of the Grand Canyon showing expanse of canyon and the various rock layers" width="392" height="261" srcset=" sizes="(max-width: 392px) 85vw, 392px"/This view shows the South Rim separated from the North Rim by approximately 18 miles.

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The pinching Temple Butte is the easiest to see, but even between the Muav and Redwall, there is an Wikimedia Commons' src=" alt="The rocks are mostly red." width="300" height="224" srcset=" sizes="(max-width: 300px) 85vw, 300px"/The theory that the outer layer of the Earth (the lithosphere) is broken in several plates, and these plates move relative to one another, causing the major topographic features of Earth (e.g.

mountains, oceans) and most earthquakes and volcanoes.

Based on Hutton’s uniformitarianism, early geologists could surmise that geological processes work slowly and that the Earth is very old.

The discovery of radioactive An atom that has different number of neutrons but the same number of protons.

These layers of rock are continuous over a wide region of the Colorado Plateau surrounding the Grand Canyon.

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