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.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/creeks/youngs-creek/directions/2.md
