Geomophology of the Onawa Pluton

Hornfels rim encircling the Onawa pluton (purple) southeast of Greenville. The Carabassett Formation comprises the hornfels mountains and the lowlands beyond the contact areole. The Appalachian trail (not shown) treks northeast across Wilson Stream and along the hornfels ridge containing Barren, Fourth, Third and Columbus mountains. From there it moves north into the White Cap Range, also hornfels, and onto Mount Katahdin where it ends or begins. The near vertical cliffs around the basin coupled with the uniformity of the contact aerole suggest that the Onawa pluton is an elongate stock with steep margins.

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Image by Lindley Hanson.
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