as a consequence. This was the first major oil region to be developed.

The Catskill was once considered to be related to the Old Red Sandstone, but in actuality, the two are only coincidentally similar. Both formed at approximately the same time, and under similar conditions: to the north of the Acadian Mountains were the Caledonian Mountains, and a similar region of marsh and river delta formed there.

Glacial erosion

Though both mountain ranges were formed during the Acadian orogeny,

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