CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE
	wtr	---	water	---
	Qa	Quaternary	alluvium	---
	Qls	Holocene-Pleistocene	mass-wasting deposits, mostly landslides	---
	Qoa	Holocene-Pleistocene	alluvium, older	---
	Qt	Holocene-Pleistocene	terraced deposits	---
	Mvi	Miocene	volcanics, invasive	---
	Mvi(cr)	Miocene	basalt flows	Columbia River Basalt Group, undivided, invasive
	Mm(1u)	Miocene, middle	marine sedimentary rocks	Astoria Formation, upper
	Mv(g)	Miocene, middle	basalt flows	Grande Ronde Basalt, Columbia River Basalt Group
	Mv(sp)	Miocene, middle	basalt flows	Pomona Member, Saddle Mountains Basalt
	Mv(wfs)	Miocene, middle	basalt flows	Frenchman Springs Member, Wanapum Basalt
	Mvi(g)	Miocene, middle	basalt flows, invasive	Grande Ronde Basalt, invasive
	Mvi(sp)	Miocene, middle	basalt flows, invasive	Pomona Member, Saddle Mountains Basalt
	Mm(1b)	Miocene, lower-mid	marine sedimentary rocks	Bald Ridge member, Astoria Formation
	Mm(1l)	Miocene, lower-mid	marine sedimentary rocks	lower member, Astoria Formation
	Mm(1n)	Miocene, lower-mid	marine sedimentary rocks	Naselle member, Astoria Formation
	OEm(lc)	Oligocene-Eocene	marine sedimentary rocks	Lincoln Creek Formation
	OEm(ls)	Oligocene-Eocene	marine sedimentary rocks	Lincoln Creek Formation, sandstone member of
	Eiqm(o)	Eocene, upper	quartz monzonite	Ordway Creek stock
	Em(2sk)	Eocene, upper	marine sedimentary rocks	Skamokawa Creek, siltstone of
	Em(2)	Eocene, mid-upper	marine sedimentary rocks	unit B of Wolfe and McKee
	Em(2cp)	Eocene, mid-upper	marine sedimentary rocks	Cliff Point, siltstone at
	Em(2m)	Eocene, mid-upper	marine sedimentary rocks	McIntosh Formation
	Em(2op)	Eocene, mid-upper	marine sedimentary rocks	Omeara Point, siltstone and sandstone of
	Em(2s)	Eocene, mid-upper	marine sedimentary rocks	sandstone in unit B of Wolfe and McKee
	Em(2sb)	Eocene, mid-upper	marine sedimentary rocks	Shoalwater Bay, siltstone of
	En(c)	Eocene, mid-upper	nearshore sedimentary rocks	Cowlitz Formation
	Evb(gr)	Eocene, mid-upper	basalt flows	Grays River, volcanic rocks of
	Eib	Eocene	basic intrusive rocks	---
	Em(2ms)	Eocene	marine sedimentary rocks	McIntosh Formation, sandstone member of
	Evt	Eocene	tuffs and tuff breccias	---
	Em(1)	Eocene, middle	marine sedimentary rocks	---
	Ev(c)	Eocene, lower-mid	basalt flows and flow breccias, Crescent Formation	Crescent Formation