After the turn you will be transitioning from an alluvium fan deposit (Qaf) to glacial lake deposits (Qglr).
Qglr: Recessional glaciolacustrine (glacial lake) deposits—Silt and clayey or sandy silt to silty sand, typically with scattered dropstones; soft; light brown-gray to gray; deposited in proglacial lakes.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/creeks/youngs-creek/directions/2a.md