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	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qd	Holocene	dune sand	---
	Qp	Holocene	peat 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	Pleistocene	outburst flood deposits, sand and silt, late Wisconsin	Missoula, glacial Lake, deposits of
	Qgd	Pleistocene	continental glacial drift, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgl	Pleistocene	glaciolacustrine deposits, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qglf	Pleistocene	glaciolacustrine and outburst flood deposits, undivided, Fraser-age	---
	Qgo	Pleistocene	continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgpo	Pleistocene	continental glacial outwash, pre-Fraser	---
	Qgpt	Pleistocene	continental glacial till, pre-Fraser	---
	Qgt	Pleistocene	continental glacial till, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Mc(l)	Miocene	continental sedimentary deposits or rocks	Latah 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
	Eida	Eocene	intrusive dacite	---
	Eii(h)	Eocene	intermediate intrusive rocks	Herron Creek suite
	Eimd(d)	Eocene	monzodiorite	Devils Elbow suite
	Eimd(f)	Eocene	monzodiorite	Friedlander Meadows pluton
	Ev(s)	Eocene	volcanic rocks	Sanpoil Volcanics
	Eva(s)	Eocene	andesite flows	Sanpoil Volcanics
	Evd(s)	Eocene	dacite flows	Sanpoil Volcanics
	Evt(s)	Eocene	tuffs and tuff breccias	Sanpoil Volcanics
	EPAia(j)	Eocene-Paleocene	acidic intrusive rocks	Johnny George, plutonic complex of
	EPAia(mc)	Eocene-Paleocene	acidic intrusive rocks	Manila Creek,porphyritic granodiorite of,Keller Butte pluton
	EPAia(s)	Eocene-Paleocene	acidic intrusive rocks	Swawilla Basin, biotite granite of, Keller Butte pluton
	EPAiat(s)	Eocene-Paleocene	two-mica granite	Swawilla Basin, granite of, Keller Butte pluton
	EPAig(g)	Eocene-Paleocene	granite	George Creek, granite of
	EPAig(kb)	Eocene-Paleocene	granite	Keller Butte pluton, porphyritic granite of
	EPAig(mt)	Eocene-Paleocene	granite	Mount Tolman, quartz porphyry of, Keller Butte pluton
	EPAmg(j)	Eocene-Paleocene	migmatite	Johnny George, migmatite of
	Tbx(s)	Tertiary	tectonic breccia	Fort Spokane,tectonic breccia west of
	TKid(j)	Tertiary-Cretaceous	diorite	Johnny George, diorite of
	TKig(c)	Tertiary-Cretaceous	granite	Creston, biotite granite near
	pTbg(e)	pre-Tertiary	banded gneiss	Elmer City, gneiss near
	Ki	Cretaceous	intrusive rocks, undivided	---
	Kia(g)	Cretaceous	acidic intrusive rocks	Germania mine, granite near the
	Kia(m)	Cretaceous	acidic intrusive rocks	Midnite mine pluton
	Kia(mr)	Cretaceous	acidic intrusive rocks	Mitre Rock,altered granitoid rocks of
	Kiaa	Cretaceous	alaskite-aplite-pegmatite	---
	Kiat(pb)	Cretaceous	two-mica granite	Pitney Butte, granite of
	Kig	Cretaceous	granite	---
	Kig(b)	Cretaceous	granite	Blue Creek, granite of
	Kig(g)	Cretaceous	granite	Germania mine, granite near the
	Kig(l)	Cretaceous	granite	Lilienthal Mountain, granite of
	Kig(o)	Cretaceous	granite	Owl Creek, granite of
	Kigd(b)	Cretaceous	granodiorite	Benjamin Lake, granodiorite of
	Kigd(h)	Cretaceous	granodiorite	Hawk Creek, granodiorite of
	Kir	Cretaceous	intrusive rhyolite	---
	Omm(c)	Ordovician	marine metasedimentary rocks	Covada Group
	OCcb(d)	Ordovician-Cambrian	metacarbonate	Metaline Formation, bedded dolomite of
	OCcb(l)	Ordovician-Cambrian	metacarbonate	Metaline Formation, massive limestone of
	OCcb(m)	Ordovician-Cambrian	metacarbonate	Metaline Formation
	OYcb(c)	Ordovician-middle Proterozoic	metacarbonate	Cayuse Mountain-Mill Canyon area, metasediments of
	OYh(c)	Ordovician-middle Proterozoic	hornfels	Cayuse Mountain-Mill Canyon area, metasediments of
	OYmm(c)	Ordovician-middle Proterozoic	marine metasedimentary rocks	Cayuse Mountain-Mill Canyon area, metasediments of
	OYph(c)	Ordovician-middle Proterozoic	phyllite, low grade	Cayuse Mountain-Mill Canyon area, metasediments of
	OYq(c)	Ordovician-middle Proterozoic	quartzite, low grade	Cayuse Mountain-Mill Canyon area, metasediments of
	CZq(a)	Cambrian-upper Proterozoic	quartzite, low grade	Addy Quartzite
	CYq(c)	Cambrian-middle Proterozoic	quartzite, low grade	Creston Butte, quartzite of
	Zib	upper Proterozoic	basic intrusive rocks	---
	Yar(m)	middle Proterozoic	argillite	McHale Slate, Deer Trail Group
	Yar(t)	middle Proterozoic	argillite	Togo Formation, Deer Trail Group
	Ycb(e)	middle Proterozoic	metacarbonate	Edna Dolomite, Deer Trail Group
	Ycb(s)	middle Proterozoic	metacarbonate	Stensgar Dolomite, Deer Trail Group
	Yq(t)	middle Proterozoic	quartzite, low grade	Togo Formation, Deer Trail Group