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	wtr	---	water	---
	Qd	Holocene	dune sand	---
	Qf	Holocene	artificial fill, including modified land	---
	Qla	Holocene	lacustrine deposits	---
	Qa	Holocene-Pleistocene	alluvium	---
	Qaf	Holocene-Pleistocene	alluvial fan deposits	---
	Ql	Holocene-Pleistocene	loess	Palouse Formation
	Qt	Holocene-Pleistocene	terraced deposits	---
	QMls	Holocene-Miocene	mass-wasting deposits, mostly landslides	---
	Qf(b)	Pleistocene	Bonneville flood deposits	Bonneville flood deposits
	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
	QMcg	Pleistocene-Miocene	continental sedimentary deposits, conglomerate	---
	Mv(slm)	Miocene, upper	basalt flows	Lower Monumental Member, Saddle Mountains Basalt
	Mv(s)	Miocene, mid-upper	basalt flows	Saddle Mountains Basalt, Columbia River Basalt Group
	Mc	Miocene	continental sedimentary deposits, conglomerate	---
	Mv(g)	Miocene, middle	basalt flows	Grande Ronde Basalt, Columbia River Basalt Group
	Mv(gN1)	Miocene, middle	basalt flows	Grande Ronde Basalt, N1 (lower flows of norm.mag.pol.)
	Mv(gN2)	Miocene, middle	basalt flows	Grande Ronde Basalt, N2 (upper flows of norm.mag.pol.)
	Mv(gR1)	Miocene, middle	basalt flows	Grande Ronde Basalt, R1 (CRB)
	Mv(gR2)	Miocene, middle	basalt flows	Grande Ronde Basalt, R2 (upper flows of rev.mag.pol.)
	Mv(sa)	Miocene, middle	basalt flows	Asotin Member, Saddle Mountains Basalt
	Mv(se)	Miocene, middle	basalt flows	Esquatzel 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(swc)	Miocene, middle	basalt flows	Wilbur Creek Member, Saddle Mountains Basalt
	Mv(swr)	Miocene, middle	basalt flows	Weissenfels Ridge Member, Saddle Mountains Basalt
	Mv(wfe)	Miocene, middle	basalt flows	Frenchman Spr. and Eckler Mtn. Members, Wanapum Basalt
	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
	TKimd	Paleo-Cretaceous	monzodiorite	---
	Kia	Cretaceous	acidic intrusive rocks	---
	Kiaa	Cretaceous	alaskite-aplite-pegmatite	---
	Kigd(gp)	Cretaceous	granodiorite	Granite Point, granodiorite of
	Kit	Cretaceous	tonalite	---
	pKph	pre-Cretaceous	phyllite, low grade	---
	pKqz	pre-Cretaceous	quartzite, high grade	---