CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE
	wtr	---	water	---
	ice	Holocene	ice	---
	Qa	Holocene	alluvium	---
	Qaf	Holocene	alluvial fan deposits	---
	Qat	Holocene	alpine glacial till, Fraser-age	---
	Qls	Holocene	mass-wasting deposits, mostly landslides	---
	Qta	Holocene	talus deposits	---
	Qvb(suc)	Holocene	basalt flows	Sulphur Creek, basalt of
	Qa	Holocene-Pleistocene	alluvium	---
	Qad	Holocene-Pleistocene	alpine glacial drift, Fraser-age	---
	Qls	Holocene-Pleistocene	mass-wasting deposits, mostly landslides	---
	Qoa	Holocene-Pleistocene	alluvium, older	---
	Qp	Holocene-Pleistocene	peat deposits	---
	Qv	Quaternary	volcanic rocks	---
	Qva(b)	Holocene-Pleistocene	andesite flows	Mount Baker, andesite of
	Qva(bb)	Quaternary	andesite flows	Black Buttes, andesite of
	Qva(br)	Quaternary	andesite flows	Bastille Ridge, andesite of
	Qva(cd)	Quaternary	andesite flows	Cougar Divide, andesite of
	Qva(cp)	Quaternary	andesite flows	Coleman Pinnacle, andesite of
	Qva(ld)	Quaternary	andesite flows	Lava Divide, andesite of
	Qva(lr)	Quaternary	andesite flows	Lasiocarpa Ridge, andesite of
	Qva(p)	Quaternary	andesite flows	The Portals, andesite of
	Qva(tm)	Quaternary	andesite flows	Table Mountain, andesite of
	Qvb(ls)	Quaternary	basalt flows	Lake Shannon, basalt of
	Qvb(pa)	Quaternary	basalt flows	Park Butte, basalt of
	Qvx(b)	Quaternary	volcanic breccia	Black Buttes, breccia and tuffs of
	Qga	Pleistocene	advance continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgd	Pleistocene	continental glacial drift, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgo	Pleistocene	continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgpc	Pleistocene	glacial drift, pre-Fraser, and nonglacial deposits	---
	Qgt	Pleistocene	continental glacial till, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qva(s)	Pleistocene	andesite flows	Swift Creek, andesite of
	Qvr(k)	Pleistocene	rhyolite flows	Kulshan caldera, rocks of
	Qvt(k)	Pleistocene	tuffs and tuff breccias	Kulshan caldera, rocks of
	Qvt(ks)	Pleistocene	tuffs and tuff breccias	Kulshan caldera, ignimbrite of Swift Creek
	PLig(e)	Pliocene	granite	Egg Lake, granite porphyry of
	PLig(r)	Pliocene	granite	Ruth Mountain, granite of
	PLigd(a)	Pliocene	granodiorite	Lake Ann stock, granodiorite of
	PLiq(i)	Pliocene	quartz diorite	Icy Peak, quartz diorite and quartz monzonite of
	PLiqm(n)	Pliocene	quartz monzonite	Nooksack Cirque, quartz monzonite and granite of
	PLvt(h)	Pliocene	tuffs and tuff breccias	Hannegan Volcanics
	PLvx(h)	Pliocene	volcanic breccia	Hannegan Volcanics
	PLvx(h)	Pliocene	volcanic breccia	Hannegan Volcanics
	Mig(b)	Miocene	granite	Bear Mountain, granite of western
	Mig(d)	Miocene	granite	Depot Creek, granite of
	Migb(s)	Miocene	gabbro	Mount Sefrit Gabbronorite
	Migd	Miocene	granodiorite	---
	Migd(i)	Miocene	granodiorite	Indian Mountain phase
	Migd(r)	Miocene	granodiorite	Ruth Creek pluton
	Miqm(r)	Miocene	quartz monzonite	Redoubt Creek, quartz monzodiorite of
	Mit(c)	Miocene	tonalite	Cascade Pass, tonalite of
	Mix(b)	Miocene	intrusive breccia	Mount Buckindy pluton
	MOit(p)	Miocene-Oligocene	tonalite	Perry Creek Phase
	Oia(b)	Oligocene	acidic intrusive rocks	Mount Blum, biotite alaskite of
	Oib(ms)	Oligocene	basic intrusive rocks	miscellaneous gabbros and diorites
	Oid(e)	Oligocene	diorite	Ensawkwatch Creek, diorite of
	Oig(im)	Oligocene	granite	Index batholith, Mineral Mountain phase
	Oigb(c)	Oligocene	gabbro	Copper Lake, gabbro of
	Oigd(ib)	Oligocene	granodiorite	Index batholith, Baker River phase
	Oigd(l)	Oligocene	granodiorite	Little Beaver Creek, biotite granodiorite of
	Oigd(md)	Oligocene	granodiorite	Mount Despair, granodiorite of
	Oii(md)	Oligocene	intermediate intrusive rocks	Mount Despair, granodiorite of
	Oiq(p)	Oligocene	quartz diorite	Price Glacier pluton
	Oit(c)	Oligocene	tonalite	Chilliwack valley phase, Snoqualmie batholith
	Oit(c)	Oligocene	tonalite	Chilliwack valley phase, Snoqualmie batholith
	Oit(m)	Oligocene	tonalite	Middle Peak, heterogeneous tonalite and granodiorite of
	Oit(ml)	Oligocene	tonalite	Maiden Lake, tonalite of
	Oit(si)	Oligocene	tonalite	Silesia Creek pluton
	Oix(b)	Oligocene	intrusive breccia	breccia derived from granite of Mineral Mountain
	Ovc(r)	Oligocene	rhyolite flows	Mount Rahm, volcanic rocks of
	Ovd(p)	Oligocene	dacite flows	Pioneer Ridge, volcanic rocks of
	Ovd(p)	Oligocene	dacite flows	Pioneer Ridge, volcanic rocks of
	Ovt(b)	Oligocene	tuffs and tuff breccias	Big Bosom Buttes, volcanic rocks of
	Ovx(b)	Oligocene	volcanic breccia	Big Bosom Buttes, volcanic rocks of
	Ovx(p)	Oligocene	volcanic breccia	Pioneer Ridge, volcanic rocks of
	Ec	Eocene	continental sedimentary deposits, conglomerate	---
	Ec(b)	Eocene	continental sedimentary deposits, conglomerate	Barlow Pass Volcanics
	Ec(c)	Eocene	continental sedimentary deposits, conglomerate	Chuckanut Formation
	Eib(r)	Eocene	basic intrusive rocks	Ruby Creek heterogeneous plutonic belt
	Eit(r)	Eocene	tonalite	Ruby Creek heterogeneous plutonic belt
	TKam(s)	Tertiary-Cretaceous	amphibolite	Skagit Gneiss
	TKcg(b)	Tertiary-Cretaceous	continental sedimentary deposits, conglomerate	Bald Mountain, conglomerate of
	TKgn(s)	Tertiary-Cretaceous	gneiss	Skagit Gneiss
	TKib(s)	Tertiary-Cretaceous	basic intrusive rocks	Skymo Complex of Wallace (1976)
	TKid(r)	Tertiary-Cretaceous	diorite	Ruby Creek heterogeneous plutonic belt
	TKig(s)	Tertiary-Cretaceous	granite	Skagit Gneiss
	TKmg(s)	Tertiary-Cretaceous	migmatite	Skagit Gneiss
	TKms(b)	Tertiary-Cretaceous	metasedimentary rocks	Bald Mountain, conglomerate of
	TKog(s)	Tertiary-Cretaceous	orthogneiss	Skagit Gneiss
	TKog(s)	Tertiary-Cretaceous	orthogneiss	Skagit Gneiss
	Khm(lj)	Cretaceous	heterogeneous metamorphic rocks	Little Jack Mountain, phyllite & schist of
	Kigb	Cretaceous	gabbro	---
	Kigd(hl)	Cretaceous	granodiorite	Hidden Lake stock
	Kit(t)	Cretaceous	tonalite	Mount Triumph, orthogneiss of
	Kog(c)	Cretaceous	orthogneiss	Chelan complex
	Kog(e)	Cretaceous	orthogneiss	Eldorado Orthogneiss
	Kog(ef)	Cretaceous	orthogneiss	Eldorado Orthogneiss, flaser gneiss
	Kog(h)	Cretaceous	orthogneiss	Haystack Creek, orthogneiss of
	Kog(m)	Cretaceous	orthogneiss	Marble Creek, orthogneiss of
	Ku(mj)	Cretaceous	ultrabasic rocks	Mount Josephine, semischist & phyllite of
	KJm(n1)	Cretaceous-Jurassic	marine sedimentary rocks	Nooksack Formation
	KJm(n2)	Cretaceous-Jurassic	marine sedimentary rocks	Nooksack Formation
	KJm(n3)	Cretaceous-Jurassic	marine sedimentary rocks	Nooksack Formation
	KJm(n4)	Cretaceous-Jurassic	marine sedimentary rocks	Nooksack Formation
	Jc	Jurassic	continental sedimentary deposits, conglomerate	---
	Jph(d)	Jurassic	phyllite, low grade	Darrington Phyllite
	Jph(j)	Jurassic	phyllite, low grade	Mount Josephine, semischist and phyllite of
	Jsh(s)	Jurassic	schist, low grade	Shuksan Greenschist
	Jvdb(w)	Jurassic	dacite and andesite flows, breccia	Wells Creek Volcanic Member
	JTRhmc(bl)	Jurassic-Triassic	heterogeneous metamorphic rocks, chert bearing	Baker Lake, blueschist of
	JTRm(c)	Jurassic-Triassic	marine sedimentary rocks	Cultus Formation
	JTRmb(b)	Jurassic-Triassic	marble	Bell Pass melange
	JTRmt(h)	Jurassic-Triassic	metasedimentary and metavolcanic rocks	Hozomeen Group
	JTRu(b)	Jurassic-Triassic	ultrabasic rocks	Bell Pass melange
	JTRu(ts)	Jurassic-Triassic	ultrabasic rocks	Twin Sisters Dunite of Ragan (1961)
	JTRu(ts)	Jurassic-Triassic	ultrabasic rocks	Twin Sisters Dunite of Ragan (1961)
	JTRvd(c)	Jurassic-Triassic	dacite flows	Cultus Formation
	JPMhmc(b)	Jurassic-Permian	heterogeneous metamorphic rocks, chert bearing	Bell Pass melange
	JDvs(c)	Jurassic-Devonian	volcanic and sedimentary rocks	Chilliwack Group and Cultus Formation
	TRhm(cc)	Triassic	heterogeneous metamorphic rocks	Cas. Riv. unit, Chelan Mtns. terr., Cas. Riv. Schist
	TRhm(cc)	Triassic	heterogeneous metamorphic rocks	Cas. Riv. unit, Chelan Mtns. terr., Cas. Riv. Schist
	TRiq(m)	Triassic	quartz diorite	Marblemount Meta-Quartz Diorite, Chelan Mts. terrane
	TRmb(s)	Triassic	marble	Skagit Gneiss
	TRmc(h)	Triassic	metasedimentary rocks, cherty	Hozomeen Group
	TRms(cc)	Triassic	metasedimentary rocks	Cascade River Schist, Chelan Mountains terrane
	TRms(cc)	Triassic	metasedimentary rocks	Cascade River Schist, Chelan Mountains terrane
	TRmv(cc)	Triassic	metavolcanic rocks	Cascade River Schist, Chelan Mountains terrane
	TRog(mf)	Triassic	orthogneiss	MarblemountMeta-QuartzDiorite,ChelanMts.terrane,flaser gneiss
	TRog(sn)	Triassic	orthogneiss	Skagit Gneiss, orthogneiss of The Needle
	TRPMhmc(n)	Triassic-Permian	heterogeneous metamorphic rocks, chert bearing	Napeequa unit, Chelan Mtns. terr., Napeequa Schist
	TRPMhmc(n)	Triassic-Permian	heterogeneous metamorphic rocks, chert bearing	Napeequa unit, Chelan Mtns. terr., Napeequa Schist
	TRPMu(n)	Triassic-Permian	ultrabasic rocks	Napeequa unit, Chelan Mountains terrane
	TRPMu(n)	Triassic-Permian	ultrabasic rocks	Napeequa unit, Chelan Mountains terrane
	TRPMu(s)	Triassic-Permian	ultrabasic rocks	Skagit Gneiss
	MZPZigb	Mesozoic-Paleozoic	gabbro	---
	MZPZit	Mesozoic-Paleozoic	tonalite	---
	MZPZms(r)	Mesozoic-Paleozoic	metasedimentary rocks	Rinker Ridge, slate of
	PMmv(h)	Permian	metavolcanic rocks	Hozomeen Group
	PMs(c)	Permian	sedimentary deposits or rocks	Chilliwack Group, sedimentary rocks of Mount Herman
	PMvb(c)	Permian	basalt flows	Chilliwack Group, volcanic rocks of Mount Herman
	pPMhmc(v)	pre-Permian	heterogeneous metamorphic rocks, chert bearing	Vedder Complex
	PMDmb(c)	Permian-Devonian	marble	Chilliwack Group of Cairnes (1944)
	PMDms(c)	Permian-Devonian	metasedimentary rocks	Chilliwack Group of Cairnes (1944)
	PMDmv(c)	Permian-Devonian	metavolcanic rocks	Chilliwack Group of Cairnes (1944)
	Pmm(h)	Pennsylvanian	marine metasedimentary rocks	Hozomeen Group
	pDgn(y)	pre-Devonian	gneiss	Yellow Aster Complex of Misch (1966)
	pDi(y)	pre-Devonian	intrusive rocks, undivided	Yellow Aster Complex of Misch (1966)
	pDu(y)	pre-Devonian	ultrabasic rocks	Yellow Aster Complex of Misch (1966)