Qaf: Alluvial fan deposits (Holocene to latest Pleistocene)—Debris-flow diamicton, sand, alluvial gravel, and boulder gravel; loose; massive to moderately stratified; poorly to moderately sorted.

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https://github.com/davepinch/pinchy.cc/blob/master/content/topics/geology/wgs/snippet-description-qaf.md

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Pontiac Bay

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Geologic map of the Sultan 7.5-minute quadrangle, King and Snohomish Counties, Washington (ZIP)

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