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Geology of Crater Lake National Park

Crater Lake is a geological laboratory par excellence, for here we find an immense mountain (the hypothetical Mount Mazama) dissected for us, and its core displayed.

The cataclysmic eruption of Mount Mazama 7,700 years ago began with a towering column of pumice and ash, as depicted in Paul Rockwood's painting.

Here we have revealed to us all the evidence necessary to reconstruct the processes which formed Mount Mazama, and the clues to the activity of vulcanism and glaciation.

As the Grand Canyon gives an unequalled calendar to the entire history of sedimentary processes upon the North American continent, so Crater Lake Rim exposes the history of the more recent volcanic forces, which so appreciably altered the topography of the Northwest. [Crater Lake National Park as a Field for Scientific Research, Nature Notes From Crater Lake, Vol. 23, 1992]

Geological Maps

Crater Lake Geology in the News

 

 

 

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(Image by Grovin Thewer)

 

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