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The Thumb

From Oregon Hikers Field Guide

Descending the ridge to The Thumb (bobcat)

Description

The Thumb is the southern remnant of a basalt dike formed during the late Eocene. The small cove below was created when the dike was breached and wave action began to rapidly gouge out the much softer siltstones and claystones of the Nestucca Formation which the dike had been protecting. Various stacks and rocks scattered below you near a secluded beach portend the eventual fate of The Thumb, which will become a isolated sea stack in a hundred thousand generations or so.

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Oregon Hikers Field Guide is built as a collaborative effort by its user community. While we make every effort to fact-check, information found here should be considered anecdotal. You should cross-check against other references before planning a hike. Trail routing and conditions are subject to change. Please contact us if you notice errors on this page.

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