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From the beginning of this course, we have stated that the Earth is about 4.6 billion years old.
How do we know this and how do we know the ages of other events in Earth history?
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.
By carefully digging, we have found that each trash pit shows a sequence of layers.
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.
Principles of Stratigraphy Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust.
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Principle of Superposition Because of Earth's gravity, deposition of sediment will occur depositing older layers first followed by successively younger layers.
In either case, the inclusions had to be present before they could be included in the younger rock, therefore, the inclusions represent fragments of an older rock.
This principle is often useful for distinguishing between a lava flow and a sill.
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.Thus, we know that the dike is younger than the mudstone, sandstone, and shale.
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