Throughout geologic time, corals have been the only reef-building organism.
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Q145: Detrital sedimentary rocks have clastic textures.
Q146: Peat is thought to be the original
Q147: The principle form of carbon in the
Q148: Interbedded cherts with banded iron formations, or
Q149: Chalk, coquina, and ancient coral reefs are
Q151: An internal mould is a fossil replica
Q152: Flint, jasper, and travertine are microcrystalline forms
Q153: Many limestones are of biochemical origin.
Q154: Mud cracks in a shale or mudstone
Q155: Lignite occurs in the prairie provinces and
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