Bishop Tuff

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Two layers of the Bishop Tuff: lower layer was from ashfall, upper layer was from the main pyroclastic flow.
Two layers of the Bishop Tuff: lower layer was from ashfall, upper layer was from the main pyroclastic flow.
Southern margin of pyroclastic flow looking west towards the Sierra Nevada Mountains. The Lower Owens River is seen along the edge of the flow, and the town of Bishop, California at left.
Southern margin of pyroclastic flow looking west towards the Sierra Nevada Mountains. The Lower Owens River is seen along the edge of the flow, and the town of Bishop, California at left.

The Bishop Tuff is located in the Owens Valley, southeast of Mammoth Lakes, California. It is a welded tuff that formed 760,000 years ago as a rhyolitic pyroclastic flow during the eruption that created the Long Valley Caldera.

The Bishop Tuff covers nearly 2,200 square kilometers of area, forming the Volcanic Tablelands, with deposits ranging from 150 to 200 meters in thickness.

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