The Thumb

The Thumb is a mountain in British Columbia’s Stikine Region on the east side of Bear Lake, where it stands on the Continental Divide between waters flowing north to the Arctic and west to the Pacific. It is the largest of about seven volcanic plugs in the Omineca Mountains, surrounded by eroded remains of cinder cones, lava flows, and dikes from comparatively recent volcanic activity. Loose scoria and preserved lava flows indicate formation during the Quaternary, within the last 2.5 million years. Rising about 189 metres above the Connelly Range, its steep vertical mass of columnar basalt makes it both a dramatic landmark and a geologically unusual feature.

British Columbia · Canada