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Triassic |
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Time: |
245 to 225
mya |
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Duration: |
20 million years |
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Triassic
coals have been found only in North Carolina and Virginia in the Atlantic Coastal Coal
Region of the United States; in Sonora, Mexico; at Cape Hope in Greenland; and on a few
islands in the Northwest Territories of Canada. The Triassic coal beds in Virginia and
North Carolina formed from swamps in graben valleys that developed in the core of the
Appalachian Mountains. The coals range from bituminous to anthracite and are high in
sulfur and ash (usually exceeding 15 percent). |
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