My books can beat up your dictionary!!!!
A few quotes to chew on:
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Written in Stone (Chet and Maureen Raymo) - p. 79:
"The erosion of the Acadian mountains built up a second great wedge of sediments, the Catskill Delta, within which can be found fossils of fish, which dominated the Devonian Seas, and of the first land plants."
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Hiking the Catskills (Lee McAllister) p.22:
"Geologically speaking, the Catskills are not true mountains but a plateau eroded down by millions of years of weathering. This area was beneath a shallow ocean during the Devonian Epoch (405-365 million years ago). As the North American and European continents moved slowly closer to one another, the buckling of the earth's tectonic plates caused the formation of the Appalachian Range. This went on for millions of years as water continued to run westward, forming an inland sea. The Catskill region was on the eastern fringe of this runoff and therfore retained coarse, resistant sediment buildup. The Catskills did not buckle with the rest of the Appalachians in the latter mountain building episodes, yet they stand nearly 2000 feet higher than the surrounding Appalachian plateau. It is believed the entire Catskill region uplifted during this time."
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Forest and Crag (Guy and Laura Waterman) p.xxxvii:
"Not a true mountain range, but properly speaking, an eroded peneplain, they seem less jagged and dramatic on top."
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Bottom line: a rose by any other name ....