Rocky coastline

This ShoreZone image shows Cape Magdalena on Dall Island in southeast Alaska. The rocky coast contains deposits of marble, some of which have been commercially mined.

The marble stratum on the west coast of Dall Island is vertically dipping—that is, it lies straight up and down. This exposes the relatively soft marble to weathering, and it erodes faster than the harder surrounding rock. Layers of shale and slate are interspersed with layers of marble, causing the alternating light and dark bands.

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Last modified
27 August 2015 - 12:56pm