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	wtr	---	water	---
	ice	Holocene	ice	---
	Qa	Holocene	alluvium	---
	Qaf	Quaternary	alluvial fan deposits	---
	Qc	Quaternary	continental sedimentary deposits or rocks	---
	Qls	Quaternary	mass-wasting deposits, mostly landslides	---
	Qls(r)	Quaternary	mass-wasting deposits	rockfalls
	Qls(s)	Quaternary	mass-wasting deposits	slump-earthflows
	Qad	Pleistocene	alpine glacial drift, Fraser-age	---
	Qao	Pleistocene	alpine glacial outwash, Fraser-age	---
	Qap	Pleistocene	alpine glacial drift, pre-Fraser	---
	Qap	Pleistocene	alpine glacial drift, pre-Fraser	---
	Qap	Pleistocene	alpine glacial drift, pre-Fraser	---
	Qapo	Pleistocene	alpine glacial outwash, pre-Fraser	---
	Qapt	Pleistocene	alpine glacial till, pre-Fraser	---
	Qapt(m)	Pleistocene	alpine glacial till, pre-Fraser	morainal deposits
	Qat	Pleistocene	alpine glacial till, Fraser-age	---
	Qat(m)	Pleistocene	alpine glacial till, Fraser-age	morainal 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
	Qgl	Pleistocene	glaciolacustrine deposits, 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
	Qgt	Pleistocene	continental glacial till, Fraser-age	mostly Vashon Stade in western WA; unnamed in eastern WA
	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
	MEml	Miocene-Eocene	marine clastic rocks	dominantly thick-bedded lithic sandstone
	OEm	Oligocene-Eocene	marine sedimentary rocks	---
	OEm(r)	Oligocene-Eocene	marine sedimentary rocks	rhythmic thin- to medium-bedded sandstone and shale
	OEm(t)	Oligocene-Eocene	marine sedimentary rocks	thick-bedded sandstone with thin-bedded sandstone and shale
	OEml	Oligocene-Eocene	marine clastic rocks	dominantly thick-bedded lithic sandstone
	OEml(c)	Oligocene-Eocene	marine clastic rocks	dominantly thick-bedded lithic sandstone
	OEva	Oligocene-Eocene	andesite flows	---
	OEvb	Oligocene-Eocene	basalt flows	---
	Em(2)	Eocene, middle to upper	marine sedimentary rocks	---
	Em(2a)	Eocene, middle to upper	marine sedimentary rocks	Aldwell Formation
	Em(2c)	Eocene, middle to upper	marine sedimentary rocks	conglomerates, well-rounded pebble
	Em(1)	Eocene	marine sedimentary rocks	---
	Eva	Eocene	andesite flows	---
	Evb	Eocene	basaltic rocks	---
	Ev(cf)	Eocene, lower to middle	basalt flows and flow breccias, Crescent Formation	Crescent Formation, flows of
	Ev(cp)	Eocene, lower to middle	basalt flows and flow breccias, Crescent Formation	Crescent Formation, pillowed
	EPAm	Eocene-Paleocene	marine sedimentary rocks	Blue Mountain unit of the Crescent Formation
	EPAm(c)	Eocene-Paleocene	marine sedimentary rocks	Blue Mountain unit of the Crescent Formation, conglomerate of
	EPAml	Eocene-Paleocene	marine clastic rocks	dominantly thick-bedded lithic sandstone