Figure 16

Regional Geologic Map Legend

Age	Symbol	Map unit description
		Surficial deposits of glacial and stream sediments.
		Volcanic and glacial deposits of modern and ancestral Mount Shasta.
		Volcanic debris avalanche deposit from the collapse of ancestral Mount Shasta.
		High Cascade volcanic rocks younger than 1.8 million years (excluding Mount Shasta).
		High Cascade volcanic rocks older than 1.8 million years.
		Western Cascade volcanic rocks.
		Pre-Cascade bedrock including the Trinity ultramafic complex, Paleozoic metamorphic rocks, and the Cretaceous Hornbrook Formation.
		Lakes.

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