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26 Mar

Look at the many photographs of the Grand Canyon in your textbook.Note that you can follow the layers all along the walls of the canyon, and you can find the same layers on both sides of the canyon.Principles of Stratigraphy Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust.

Although the types of trash in each pit is quite variable, each layer has a distinctive kind of trash that distinguishes it from other layers in the pits.In fact, sedimentary rocks are, in a sense, trash from the Earth's surface deposited in basins.Principle of Original Horizontality Sedimentary strata are deposited in layers that are horizontal or nearly horizontal, parallel to or nearly parallel to the Earth's surface.In the diagram to the right,the fault cuts the limestone and the sandstone, but does not cut the basalt.Thus we know that the fault is younger than the limestone and shale, but older than the basalt above.