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20-Nov-2017 17:22

is a way to use geometric relationships between rock bodies to determine the sequence of geologic events in an area.

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(dark brown) Flat lying sedimentary rocks were eventually precipitated.(light brown) Next, fossil-rich sedimentary rocks were precipitated.These rocks are tilted due to deposition on the non-horizontal surfaces of primitive rocks.Geologist in the 1800s worked out 7 basic principles of stratigraphy that allowed them, and now us, to work out the relative ages of rocks.

Once these age relations were worked out, another principle fell into place - the principle of fossil succession.Archbishop James Ussher of Armagh, Ireland, 1654, added up generations from the Old Testament and determined that Earth formed on October 23, 4004 BCE.

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