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	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qp	Holocene	peat deposits	---
	Qls	Quaternary	mass-wasting deposits, mostly landslides	---
	Qad	Pleistocene	alpine glacial drift, Fraser-age	---
	Qao	Pleistocene	alpine glacial outwash, Fraser-age	---
	Qap	Pleistocene	alpine glacial drift, pre-Fraser	---
	Qapo	Pleistocene	alpine glacial outwash, pre-Fraser	---
	Qapo(wx)	Pleistocene	alpine glacial outwash, pre-Fraser	Weatherwax Formation
	Qapt	Pleistocene	alpine glacial till, pre-Fraser	---
	Qapw(1)	Pleistocene	alpine glacial drift, pre-Wisconsin	older
	Qapw(2)	Pleistocene	alpine glacial drift, pre-Wisconsin	younger
	Qapwo(1)	Pleistocene	alpine glacial outwash, pre-Wisconsin	older
	Qapwo(2)	Pleistocene	alpine glacial outwash, pre-Wisconsin	younger
	Qapwt(1)	Pleistocene	alpine glacial till, pre-Wisconsin	older
	Qapwt(2)	Pleistocene	alpine glacial till, pre-Wisconsin	younger
	Qat	Pleistocene	alpine glacial till, Fraser-age	---
	Qc(k)	Pleistocene	continental sedimentary deposits or rocks	Kitsap Formation
	Qga	Pleistocene	advance continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qga	Pleistocene	advance continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgas	Pleistocene	advance continental glacial outwash, sand, 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
	Qgp	Pleistocene	continental glacial drift, pre-Fraser	---
	Qgt	Pleistocene	continental glacial till, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Mm(2m)	Miocene, mid-upper	marine sedimentary rocks	Montesano Formation
	Mm(2mc)	Miocene, mid-upper	marine sedimentary rocks	Montesano Formation, conglomerate of
	Mm(2ms)	Miocene, mid-upper	marine sedimentary rocks	Montesano Formation, sandstone of
	Mm(2mt)	Miocene, mid-upper	marine sedimentary rocks	Montesano Formation, siltstone of
	Mml	Miocene	marine clastic rocks	dominantly thick-bedded lithic sandstone
	Mm(1)	Miocene, lower-mid	marine sedimentary rocks	---
	Mm(1a)	Miocene, lower-mid	marine sedimentary rocks	Astoria Formation
	MEbx	Miocene-Eocene	tectonic breccia	---
	MEm	Miocene-Eocene	marine sedimentary rocks	---
	MEm(r)	Miocene-Eocene	marine sedimentary rocks	rhythmic thin- to medium-bedded sandstone and shale
	MEm(t)	Miocene-Eocene	marine sedimentary rocks	thick-bedded sandstone with thin-bedded sandstone and shale
	OEm	Oligocene-Eocene	marine sedimentary rocks	---
	OEm(lc)	Oligocene-Eocene	marine sedimentary rocks	Lincoln Creek Formation
	OEm(lcs)	Oligocene-Eocene	marine sedimentary rocks	Lincoln Creek Formtion, basaltic sandstone member of
	OEvb	Oligocene-Eocene	basalt flows	---
	Em(2)	Eocene, mid-upper	marine sedimentary rocks	---
	Em(2ht)	Eocene, mid-upper	marine sedimentary rocks	Humptulips Formation
	Eigb	Eocene	gabbro	---
	Evb	Eocene	basaltic rocks	---
	Em(1)	Eocene, middle	marine sedimentary rocks	---
	Em(1c)	Eocene, lower-mid	marine sedimentary rocks	Crescent Formation, sedimentary rocks of
	Em(1c)	Eocene, lower-mid	marine sedimentary rocks	Crescent Formation, sedimentary rocks of
	Em(1h)	Eocene, lower-mid	marine sedimentary rocks	Hoh Assemblage
	Ev(c)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation
	Ev(cf)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation, flows of
	Ev(cp)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation, pillowed
	EPAm	Eocene-Paleocene	marine sedimentary rocks	Blue Mountain unit of the Crescent Formation
	EPAml	Eocene-Paleocene	marine clastic rocks	dominantly thick-bedded lithic sandstone