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Origin of Sedimentary Rocks
The three main classes of rocks, igneous, sedimentary, and metamorphic, were first clearly distinguished in the mid-nineteenth century. At first, the origin of sedimentary rocks was much better understood than that of the other two classes. Thus geologists turned their attention to such rocks as basalt, granite, and schists, whose origin was more controversial. For years, the only questions asked about sedimentary rocks were how old are they? or How can they be correlated with each other?
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