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	wtr	---	water	---
	Qa	Holocene-Pleistocene	alluvium	---
	Qd	Holocene-Pleistocene	dune sand	---
	Ql	Holocene-Pleistocene	loess	Palouse Formation
	Qls	Holocene-Pleistocene	mass-wasting deposits, mostly landslides	---
	Qoa	Quaternary?	alluvium, older	---
	Qfg	Pleistocene	outburst flood deposits, gravel, late Wisconsin	Missoula, glacial Lake, deposits of
	Qfs	Pleistocene	outburst flood deposits, late Wisconsin	Missoula, glacial Lake, deposits of
	PLMc(r)	Pliocene-Miocene	continental sedimentary deposits, conglomerate	Ringold Formation
	PLMcg(r)	Pliocene-Miocene	continental sedimentary deposits, conglomerate	Ringold Formation
	Mv(gN2)	Miocene, middle	basalt flows	Grande Ronde Basalt, N2 (upper flows of norm.mag.pol.)
	Mv(gR2)	Miocene, middle	basalt flows	Grande Ronde Basalt, R2 (upper flows of rev.mag.pol.)
	Mv(wfs)	Miocene, middle	basalt flows	Frenchman Springs Member, Wanapum Basalt
	Mv(wpr)	Miocene, middle	basalt flows	Priest Rapids Member, Wanapum Basalt
	Mv(wr)	Miocene, middle	basalt flows	Roza Member, Wanapum Basalt