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	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qd	Holocene	dune sand	---
	Qaf	Holocene-Pleistocene	alluvial fan deposits	---
	Ql	Holocene-Pleistocene	loess	Palouse Formation
	Qls	Holocene-Pleistocene	mass-wasting deposits, mostly landslides	---
	Qfg	Pleistocene	outburst flood deposits, gravel, late Wisconsin	Missoula, glacial Lake, deposits of
	Qfs(t)	Pleistocene	outburst flood deposits,  late Wisconsin	Touchet Beds, glacial Lake Missoula
	Qt	Pleistocene	terraced deposits	---
	Mv(sem)	Miocene, upper	basalt flows	Elephant Mountain Member, Saddle Mountains Basalt
	Mv(sp)	Miocene, middle	basalt flows	Pomona Member, Saddle Mountains Basalt
	Mv(su)	Miocene, middle	basalt flows	Umatilla Member, Saddle Mountains Basalt
	Mv(wfs)	Miocene, middle	basalt flows	Frenchman Springs Member, Wanapum Basalt