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	wtr	---	water	---
	Qa	Holocene	alluvium	---
	Qb	Holocene	beach deposits	---
	Qf	Holocene	artificial fill, including modified land	---
	Qls	Holocene	mass-wasting deposits, mostly landslides	---
	Qp	Holocene	peat deposits	---
	Qvl(e)	Holocene	lahars	Electron Mudflow
	Qvl(o)	Holocene	lahars	Osceola Mudflow
	Qad(e)	Pleistocene	alpine glacial drift, Fraser-age	Evans Creek Drift
	Qap(h)	Pleistocene	alpine glacial drift, pre-Fraser	Hayden Creek Drift
	Qap(wh)	Pleistocene	alpine glacial drift, pre-Fraser	Wingate Hill Drift
	Qapo	Pleistocene	alpine glacial outwash, pre-Fraser	---
	Qc	Pleistocene	continental sedimentary deposits, conglomerate	---
	Qc(a)	Pleistocene	continental sedimentary deposits, conglomerate	Alderton Formation
	Qc(k)	Pleistocene	continental sedimentary deposits, conglomerate	Kitsap Formation
	Qc(p)	Pleistocene	continental sedimentary deposits, conglomerate	Puyallup Formation
	Qga	Pleistocene	advance continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgac	Pleistocene	advance continental glacial outwash, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	Qgas	Pleistocene	advance 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
	Qgl	Pleistocene	glaciolacustrine deposits, 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
	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	---
	Qgp(o)	Pleistocene	continental glacial drift, pre-Fraser	Orting Drift
	Qgp(s)	Pleistocene	continental glacial drift, pre-Fraser	Salmon Springs Drift
	Qgp(st)	Pleistocene	continental glacial drift, pre-Fraser	Stuck Drift
	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
	Qoa	Pleistocene	alluvium, older	---
	Qoa(sk)	Pleistocene	alluvium, older	Skokomish Gravel
	Qvl(lc)	Pleistocene	lahars	Lily Creek Formation, mudflows of
	Mii	Miocene, mid-upper	intermediate intrusive rocks	---
	Mc	Miocene	continental sedimentary deposits, conglomerate	---
	Mvc	Miocene	volcaniclastic deposits or rocks	---
	MOian	Miocene-Oligocene	intrusive andesite	---
	Oian	Oligocene	intrusive andesite	---
	Ovc(oh)	Oligocene	volcaniclastic deposits or rocks	Ohanapecosh Formation
	OEm	Oligocene-Eocene	marine sedimentary rocks	---
	OEva	Oligocene-Eocene	andesite flows	---
	Ec(2s)	Eocene, upper	continental sedimentary deposits, conglomerate	Spiketon Formation
	Ec(2c)	Eocene, mid-upper	continental sedimentary deposits, conglomerate	Carbonado Formation
	Em(2)	Eocene, mid-upper	marine sedimentary rocks	---
	Evc(n)	Eocene, mid-upper	volcaniclastic deposits or rocks	Ncraft Formation
	Ec	Eocene	continental sedimentary deposits, conglomerate	---
	Ec(2pg)	Eocene	continental sedimentary deposits, conglomerate	Puget Group
	Ec(2r)	Eocene	continental sedimentary deposits, conglomerate	Renton Formation, Puget Group
	Ec(2t)	Eocene	continental sedimentary deposits, conglomerate	Tiger Mountain Formation, Puget Group
	Eian	Eocene	intrusive andesite	---
	Evc(t)	Eocene	volcaniclastic deposits or rocks	Tukwila Formation, Puget Group
	Ev(c)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation