CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE
	wtr	---	water	---
	Qva(hc)	Holocene	andesite flows	Hackmore Creek, scoria cone of
	Qva(wc)	Holocene	andesite flows	West Crater, andesite flows of
	Qvba(cc)	Holocene	basaltic andesite flows	Chinook Creek, basaltic andesite flows of
	Qvba(pc)	Holocene	basaltic andesite flows	Puny Creek, basaltic andesite flows of
	Qvt(b)	Holocene	tuffs and tuff breccias	Bare Mountain, tephra of
	Qa	Holocene-Pleistocene	alluvium	---
	Qls	Holocene-Pleistocene	mass-wasting deposits, mostly landslides	---
	Qt	Holocene-Pleistocene	terraced deposits	---
	Qad(e)	Pleistocene	alpine glacial drift, Fraser-age	Evans Creek Drift
	Qaf	Pleistocene	alluvial fan deposits	---
	Qap(a)	Pleistocene	alpine glacial drift, pre-Fraser	Amboy drift
	Qap(h)	Pleistocene	alpine glacial drift, pre-Fraser	Hayden Creek Drift
	Qapo(a)	Pleistocene	alpine glacial outwash, pre-Fraser	Amboy drift
	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
	Qfs	Pleistocene	outburst flood deposits, late Wisconsin	Missoula, glacial Lake, deposits of
	Qgu	Pleistocene	glacial drift, undivided	---
	Qida(t)	Pleistocene	intrusive dacite	Tumtum Mountain, dacite dome of
	Qp	Pleistocene	peat deposits	---
	Qva(ca)	Pleistocene	andesite flows	Calamity Creek, andesite flows of
	Qva(tp)	Pleistocene	andesite flows	Timbered Peak, andesite flow of
	Qvb	Pleistocene	basalt flows	---
	Qvb(mb)	Pleistocene	basalt flows	Mowich Butte, basalt of
	Qvb(sp)	Pleistocene	basalt flows	Soda Peaks, basalt of
	Qvb(ss)	Pleistocene	basalt flows	Sister Rocks, basalt of
	Qvb(tch)	Pleistocene	basalt flows	Trout Creek Hill, basalt of
	Qvba(ba)	Pleistocene	basaltic andesite flows	Bare Mtn., basaltic andesite & basalt flows of
	Qvba(sp)	Pleistocene	basaltic andesite flows	Soda Peaks,basaltic andesite flows of
	Qvba(sx)	Pleistocene	basaltic andesite flows	Siouxan Creek,basaltic andesite flows of
	Qvc(sh)	Pleistocene	volcaniclastic deposits or rocks	Mount St. Helens, rocks and deposits of
	QPLva(bb)	Pleistocene-Pliocene	andesite flows	Bobs Mountain, basalt of
	QPLva(mc)	Pleistocene-Pliocene	andesite flows	McCloskey Creek, basalt of
	QPLva(mn)	Pleistocene-Pliocene	andesite flows	Mount Norway, basalt of
	QPLva(mz)	Pleistocene-Pliocene	andesite flows	Mount Zion, basalt of
	QPLvb(b)	Pleistocene-Pliocene	basalt flows	Boring Lavas
	QPLvb(be)	Pleistocene-Pliocene	basalt flows	Bear Prairie, basalt of
	QPLvb(bg)	Pleistocene-Pliocene	basalt flows	Battle Ground, basalt of
	QPLvb(br)	Pleistocene-Pliocene	basalt flows	Beacon Rock, basalt & basaltic andesite of
	PLMvb(t)	Pleistocene-Miocene	basalt flows	Troutdale Formation, volcanic breccia of
	PLMc(t)	Pliocene-Miocene	continental sedimentary deposits, conglomerate	Troutdale Formation
	Mian	Miocene	intrusive andesite	---
	Mian(ss)	Miocene	intrusive andesite	Silver Star pluton
	Mid(ss)	Miocene	diorite	Silver Star pluton
	Mig(ss)	Miocene	granite	Silver Star pluton
	Migd(ss)	Miocene	granodiorite	Silver Star pluton
	Miq(ss)	Miocene	quartz diorite	Silver Star pluton
	Mv(g)	Miocene, middle	basalt flows	Grande Ronde Basalt, Columbia River Basalt Group
	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
	Mcg(ec)	Miocene, lower	continental sedimentary deposits, conglomerate	Eagle Creek Formation
	Mva(tc)	Miocene, lower	andesite flows	Three Corner Rock, andesite flows of
	Mvb(3)	Miocene, lower	basalt flows	---
	MOvc(2)	Miocene-Oligocene	volcaniclastic deposits or rocks	---
	MOvt(2)	Miocene-Oligocene	tuffs and tuff breccias	---
	MOvt(3)	Miocene-Oligocene	tuffs and tuff breccias	---
	Ova(2)	Oligocene, upper	andesite flows	---
	Ova(1)	Oligocene, lower	andesite flows	---
	Ovt(1)	Oligocene, lower	tuffs and tuff breccias	---
	OEvba(g)	Oligocene-Eocene	basaltic andesite flows	Goble Volcanics
	OEvc(1)	Oligocene-Eocene	volcaniclastic deposits or rocks	---