What is the principle of walther's law in stratigraphy?
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A
The principle stating that sedimentary rocks were originally deposited as nearly horizontal layers
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B
The principle that the vertical succession of facies in a conformable sequence reflects the lateral succession of environments that existed adjacent to each other at the same time
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C
The principle that younger rock units are deposited on top of older units in an undisturbed sequence
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D
The principle that erosion rates and deposition rates are equal over geological time