Timber Crater – Prominent Geological Features of Crater Lake National Park
In the northeast corner of the park, there is a well preserved shield volcano capped by pyroclastic cones. From the perfection of its form, this volcano may be judged to be among the youngest of the region.The shield is approximately 5 miles in diameter, and the volume of material erupted approximates 5 cubic miles. The shield is composed essentially of flows of olivine basalt and basaltic andesite…. [Timber Crater,The Geology of Crater Lake National Park, Oregon (1942) by Howell Williams]
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