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	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qls	Holocene	mass-wasting deposits, mostly landslides	---
	Qp	Holocene	peat deposits	---
	Qvl(e)	Holocene	lahars	Electron Mudflow
	Qad(e)	Pleistocene	alpine glacial drift, Fraser-age	Evans Creek Drift
	Qad(e)	Pleistocene	alpine glacial drift, Fraser-age	Evans Creek Drift
	Qao(e)	Pleistocene	alpine glacial outwash, Fraser-age	Evans Creek Drift, outwash deposits of
	Qap(h)	Pleistocene	alpine glacial drift, pre-Fraser	Hayden Creek Drift
	Qap(wh)	Pleistocene	alpine glacial drift, pre-Fraser	Wingate Hill Drift
	Qapo(h)	Pleistocene	alpine glacial outwash, pre-Fraser	Hayden Creek Drift, outwash deposits of
	Qapo(he)	Pleistocene	alpine glacial outwash, pre-Fraser	pre-Evans Creek, post-Hayden Creek deposits
	Qapo(lh)	Pleistocene	alpine glacial outwash, pre-Fraser	Logan Hill Formation
	Qapo(wh)	Pleistocene	alpine glacial outwash, pre-Fraser	Wingate Hill Drift, outwash deposits of
	Qapt(h)	Pleistocene	alpine glacial till, pre-Fraser	Hayden Creek Drift, till deposits of
	Qapt(wh)	Pleistocene	alpine glacial till, pre-Fraser	Wingate Hill Drift, till deposits of
	Qat(e)	Pleistocene	alpine glacial till, Fraser-age	Evans Creek Drift, till deposits
	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
	Qgm	Pleistocene	continental glacial moraines, 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
	Qgog	Pleistocene	continental glacial outwash, gravel, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgos	Pleistocene	continental glacial outwash, sand, 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
	Qva(mr)	Pleistocene	andesite flows	Mount Rainier, andesite of
	Qvl(lc)	Pleistocene	lahars	Lily Creek Formation, mudflows of
	Mc(m)	Miocene, mid-upper	continental sedimentary deposits, conglomerate	Mashel Formation
	Mc(w)	Miocene, mid-upper	continental sedimentary deposits, conglomerate	Wilkes Formation
	Mir	Miocene	intrusive rhyolite	---
	Mv(g)	Miocene, middle	basalt flows	Grande Ronde Basalt, Columbia River Basalt Group
	Mvb(1)	Miocene, lower	basalt flows	---
	Mvba(1)	Miocene, lower	basaltic andesite flows	---
	Mvc(1)	Miocene, lower	volcaniclastic deposits or rocks	---
	MOiad	Miocene-Oligocene	intrusive andesite and dacite	---
	MOian	Miocene-Oligocene	intrusive andesite	---
	MOib	Miocene-Oligocene	basic intrusive rocks	---
	MOid	Miocene-Oligocene	diorite	---
	MOigb	Miocene-Oligocene	gabbro	---
	Ova	Oligocene	andesite flows	---
	Ovc(oh)	Oligocene	volcaniclastic deposits or rocks	Ohanapecosh Formation
	OEm(lc)	Oligocene-Eocene	marine sedimentary rocks	Lincoln Creek Formation
	OEvba	Oligocene-Eocene	basaltic andesite flows	---
	OEvba(g)	Oligocene-Eocene	basaltic andesite flows	Goble Volcanics
	OEvc	Oligocene-Eocene	volcaniclastic deposits or rocks	---
	OEvc(g)	Oligocene-Eocene	volcaniclastic deposits or rocks	Goble Volcanics
	OEvt	Oligocene-Eocene	tuffs and tuff breccias	---
	Em(2m)	Eocene, mid-upper	marine sedimentary rocks	McIntosh Formation
	En(sk)	Eocene, mid-upper	nearshore sedimentary rocks	Skookumchuck Formation
	Evc(n)	Eocene, mid-upper	volcaniclastic deposits or rocks	Ncraft Formation
	Ec(2pg)	Eocene	continental sedimentary deposits, conglomerate	Puget Group
	Eva	Eocene	andesite flows	---
	Eva(n)	Eocene	andesite flows	Ncraft Formation
	Evc	Eocene	volcaniclastic deposits or rocks	---
	Em(1c)	Eocene, lower-mid	marine sedimentary rocks	Crescent Formation, sedimentary rocks of
	Ev(c)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation