CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE
	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qd	Holocene	dune sand	---
	Qaf	Holocene-Pleistocene	alluvial fan deposits	---
	Ql	Quaternary	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	---
	QPLiad(s)	Pleistocene-Pliocene	intrusive andesite and dacite	Simcoe Mountains, volcanic rocks of
	QPLv(s)	Pleistocene-Pliocene	volcanic rocks	Simcoe Mountains, volcanic rocks of, vent facies
	QPLvb(s)	Pleistocene-Pliocene	basalt flows	Simcoe Mountains, volcanic rocks of
	QPLvr(s)	Pleistocene-Pliocene	rhyolite flows	Simcoe Mountains, volcanic rocks of
	QMc	Pleistocene-Miocene	continental sedimentary deposits, conglomerate	---
	PLc(d)	Pliocene, lower-mid	continental sedimentary deposits, conglomerate	Dalles Formation
	Mcg(es)	Miocene, upper	continental sedimentary deposits, conglomerate	Ellensburg Formation, Snipes Mountain conglomerate member
	Mv(sem)	Miocene, upper	basalt flows	Elephant Mountain Member, Saddle Mountains Basalt
	Mc(e)	Miocene, mid-upper	continental sedimentary deposits, conglomerate	Ellensburg 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(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
	Mv(wpr)	Miocene, middle	basalt flows	Priest Rapids Member, Wanapum Basalt
	Mv(wr)	Miocene, middle	basalt flows	Roza Member, Wanapum Basalt