Fossils of the Catskill Sea

Illustrations from a nineteenth-century geology textbook show typical marine shellfish fossils of Devonian age, a time period running from 419 to 369 million years ago. That's the age of almost all the rocks here in the Catskills. Those fossils speak to geologists of a time when all of our region lay beneath the waves of a shallow sea, sometimes called the Catskill Sea . . .

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