CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE
	wtr	---	water	---
	Qd	Holocene	dune sand	---
	Qf	Holocene	artificial fill, including modified land	---
	Qvl(t)	Holocene	lahars	Trout Lake, mudflow of
	Qa	Quaternary	alluvium	---
	Qls	Quaternary	mass-wasting deposits, mostly landslides	---
	Qoa	Quaternary	alluvium, older	---
	Qt	Quaternary	terraced deposits	---
	Qv	Quaternary	volcanic rocks	---
	Qva(bc)	Quaternary	andesite flows	Black Creek, andesite of
	Qva(fl)	Quaternary	andesite flows	Forlorn Lake, andesite of
	Qva(fu)	Quaternary	andesite flows	Forlorn Lake, upper andesite of
	Qva(l)	Quaternary	andesite flows	Laurel, andesite at
	Qva(mf)	Quaternary	andesite flows	McCoy Flat, andesite of
	Qva(pa)	Quaternary	andesite flows	Petite Mountain, andesite of
	Qva(rs)	Quaternary	andesite flows	Rattle Snake Creek, andesite of
	Qva(rt)	Quaternary	andesite flows	Race Track, andesite of the
	Qvb	Quaternary	basalt flows	---
	Qvb(ab)	Quaternary	basalt flows	Alice Butte, basalt of
	Qvb(bl)	Quaternary	basalt flows	Big Lava Bed, basalt of
	Qvb(by)	Quaternary	basalt flows	Berry Mountain, basalt of
	Qvb(cc)	Quaternary	basalt flows	Cedar Creek, basalt of
	Qvb(cp)	Quaternary	basalt flows	Camas Prairie, basalt of
	Qvb(dc)	Quaternary	basalt flows	Dry Creek, basalt of
	Qvb(fm)	Quaternary	basalt flows	Flattop Mountain, basalt of
	Qvb(gb)	Quaternary	basalt flows	Grouse Butte, basalt of
	Qvb(gc)	Quaternary	basalt flows	Gilmer Creek, basalt of
	Qvb(gl)	Quaternary	basalt flows	Goose Lake, basalt of
	Qvb(gm)	Quaternary	basalt flows	Guler Mountain, basalt of
	Qvb(gp)	Quaternary	basalt flows	Gifford Peak, basalt of
	Qvb(hb)	Quaternary	basalt flows	Hauk Butte, basalt of
	Qvb(ic)	Quaternary	basalt flows	Ice Cave, basalt of
	Qvb(ih)	Quaternary	basalt flows	Indian Heaven, basalt of
	Qvb(lc)	Quaternary	basalt flows	Lake Comcomly, basalt of
	Qvb(lo)	Quaternary	basalt flows	Lost Creek, basalt of
	Qvb(lp)	Quaternary	basalt flows	Lapham Creek, basalt of
	Qvb(lw)	Quaternary	basalt flows	Little White Salmon, basalt of
	Qvb(mb)	Quaternary	basalt flows	Mowich Butte, basalt of
	Qvb(ml)	Quaternary	basalt flows	McClellan Meadows, basalt of
	Qvb(ns)	Quaternary	basalt flows	S Prairie, basalt N of
	Qvb(pb)	Quaternary	basalt flows	Peterson Butte, basalt of
	Qvb(pm)	Quaternary	basalt flows	Papoose Mountain, basalt of
	Qvb(ps)	Quaternary	basalt flows	Peterson Ridge, basalt of
	Qvb(pt)	Quaternary	basalt flows	Petite Mountain, basalt of
	Qvb(rk)	Quaternary	basalt flows	Rock Creek, basalt of
	Qvb(sa)	Quaternary	basalt flows	Sahalee Tyee, basalt of
	Qvb(sd)	Quaternary	basalt flows	Sheridan Point, basalt of
	Qvb(sl)	Quaternary	basalt flows	Sheep Lakes, basalt of
	Qvb(sr)	Quaternary	basalt flows	Red Mountain,basalt cone Seast of
	Qvb(su)	Quaternary	basalt flows	Sugar Bowl Butte, basalt of
	Qvb(tch)	Quaternary	basalt flows	Trout Creek Hill, basalt of
	Qvb(tl)	Quaternary	basalt flows	Thomas Lake, basalt of
	Qvb(tw)	Quaternary	basalt flows	Wart, basalt of The
	Qvb(uw)	Quaternary	basalt flows	Underwood Mountain, basalt of
	Qvb(wn)	Quaternary	basalt flows	White Salmon, basalt N of
	Qvb(ws)	Quaternary	basalt flows	White Salmon, basalt of
	Qvba(bh)	Quaternary	basaltic andesite flows	Big Huckleberry Mtn., basaltic andesite of
	Qvba(bi)	Quaternary	basaltic andesite flows	Bill Butte, basaltic andesite of
	Qvba(cl)	Quaternary	basaltic andesite flows	Cascade landslide, basaltic andesite of
	Qvba(el)	Quaternary	basaltic andesite flows	Eunice Lake, basaltic andesite of
	Qvba(jc)	Quaternary	basaltic andesite flows	Juice Creek, basaltic andesite of
	Qvba(qb)	Quaternary	basaltic andesite flows	Quigley Butte, basaltic andesite of
	Qao(e)	Pleistocene	alpine glacial outwash, Fraser-age	Evans Creek Drift, outwash deposits of
	Qapt(h)	Pleistocene	alpine glacial till, pre-Fraser	Hayden Creek Drift, till deposits of
	Qat(e)	Pleistocene	alpine glacial till, Fraser-age	Evans Creek Drift, till deposits
	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
	QPLc(s)	Pleistocene-Pliocene	continental sedimentary deposits, conglomerate	Swale Creek Valley, sedimentary deposits of
	QPLida(g)	Pleistocene-Pliocene	intrusive dacite	Gross Mountain, dacite dome of
	QPLvb	Pleistocene-Pliocene	basalt flows	---
	QPLvb(bl)	Pleistocene-Pliocene	basalt flows	Balch Lake, basalt porphyry of
	QPLvb(s)	Pleistocene-Pliocene	basalt flows	Simcoe Mountains, volcanic rocks of
	QPLvd(sn)	Pleistocene-Pliocene	dacite flows	Snowden, dacite of
	PLida	Pliocene	intrusive dacite	---
	PLiq(w)	Pliocene	quartz diorite	Wind Mountain and Shell Rock, quartz diorite of
	PLMiba	Pliocene-Miocene	intrusive basaltic andesite	---
	Mc(d)	Miocene, upper	continental sedimentary deposits, conglomerate	Dalles Formation
	Mcg(es)	Miocene, upper	continental sedimentary deposits, conglomerate	Ellensburg Formation, Snipes Mountain conglomerate member of
	Mvt(3)	Miocene, upper	tuffs and tuff breccias	---
	Mc(e)	Miocene, mid-upper	continental sedimentary deposits, conglomerate	Ellensburg Formation
	Mib	Miocene	basic intrusive rocks	---
	Mid	Miocene	diorite	---
	Mida	Miocene	intrusive dacite	---
	Mvba	Miocene	basaltic andesite flows	---
	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(gR2)	Miocene, middle	basalt flows	Grande Ronde Basalt, R2 (upper flows of rev.mag.pol.)
	Mv(sp)	Miocene, middle	basalt flows	Pomona Member, Saddle Mountains 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
	Mvb(4)	Miocene, middle	basalt flows	---
	Mcg(ec)	Miocene, lower	continental sedimentary deposits, conglomerate	Eagle Creek Formation
	Mva(cb)	Miocene, lower	andesite flows	Council Bluff, volcanic rocks of
	Mva(st)	Miocene, lower	andesite flows	Stevenson Ridge, volcanic rocks of
	Mvb(3)	Miocene, lower	basalt flows	---
	Mvba(3)	Miocene, lower	basaltic andesite flows	---
	Mvd(3)	Miocene, lower	dacite flows	---
	Mvs(3)	Miocene, lower	volcanic and sedimentary rocks	---
	MOir(m)	Miocene-Oligocene	intrusive rhyolite	Mann Butte, rhyolite of
	MOvt	Miocene-Oligocene	tuffs and tuff breccias	---
	Ova(2)	Oligocene, upper	andesite flows	---
	Ovba(2)	Oligocene, upper	basaltic andesite flows	---
	Ovc(2)	Oligocene, upper	volcaniclastic deposits or rocks	---
	Ovt(2)	Oligocene, upper	tuffs and tuff breccias	---