Earth Physical Geology
Quiz 6: Sedimentary Rocks
Flint, jasper, and travertine are microcrystalline forms of calcite.
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The mineral dolomite, which is the major mineral of the sedimentary rock dolostone, is a carbonate of calcium and magnesium.
Interbedded cherts with banded iron formations, or with volcanic ash deposits, are taken to mean that the Precambrian oceans had more dissolved silica or more volcanism.
Peat is thought to be the original material from which coals are formed.
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