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Posted by / 28-Jul-2019 18:45

Inclusions rock dating

The Grand Canyon is particularly good for this because different sedimentary rocks have different colors.For example, the mudstone, sandstone and shale are cut by the basalt dike, so we know that the mudstone, sandstone, and shale had to be present before the intrusion of the basalt dike.Sediment deposited on steep slopes will be washed away before it is buried and lithified to become sedimentary rock, but sediment deposited in nearly horizontal layers can be buried and lithified.Thus rocks that we now see inclined or folded have been disturbed since their original deposition.In the diagram to the right,the fault cuts the limestone and the sandstone, but does not cut the basalt.

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.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.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.

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