| CLICK ON A COLORED AREA OF THE GEOLOGY MAP TO SHOW INFORMATION HERE | ||||
| wtr | --- | water | --- | |
| Qa | Holocene | alluvium | --- | |
| Qls | Holocene-Pleistocene | mass-wasting deposits, mostly landslides | --- | |
| 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 | |
| Ec(o) | Eocene | continental sedimentary deposits, conglomerate | O'Brien Creek Formation | |
| Ecg(o) | Eocene | continental sedimentary deposits, conglomerate | O'Brien Creek Formation | |
| Ecg(t) | Eocene | continental sedimentary deposits, conglomerate | Tiger Formation | |
| Eia(s) | Eocene | acidic intrusive rocks | Sheppard Granite | |
| Eid | Eocene | diorite | --- | |
| Eidaa | Eocene | intrusive dacite and andesite | --- | |
| Eigd(hr) | Eocene | granodiorite | Hooknose Ridge, granitic rocks near | |
| Eii | Eocene | intermediate intrusive rocks | --- | |
| Eik(w) | Eocene | alkalic intrusive rocks | Williams Lake area, shonkinite in | |
| Eir | Eocene | intrusive rhyolite | --- | |
| Eis(c) | Eocene | syenite | Coryell, intrusive rocks of | |
| Etz | Eocene | tectonic zone | --- | |
| Eva | Eocene | andesite flows | --- | |
| Evc | Eocene | volcaniclastic deposits or rocks | --- | |
| Evd(s) | Eocene | dacite flows | Sanpoil Volcanics | |
| Evdb(s) | Eocene | dacite and andesite flows, breccia | Sanpoil Volcanics, breccia of | |
| Kcg(s) | Cretaceous, upper | continental sedimentary deposits, conglomerate | Sophie Mountain Formation | |
| Kia(gp) | Cretaceous | acidic intrusive rocks | Galena Point Granodiorite | |
| Kia(l) | Cretaceous | acidic intrusive rocks | Le Clerc Creek, granodiorite of | |
| Kia(n) | Cretaceous | acidic intrusive rocks | Narcisse Creek, monzogranite near | |
| Kia(s) | Cretaceous | acidic intrusive rocks | Starvation Flat Quartz Monzonite | |
| Kia(sp) | Cretaceous | acidic intrusive rocks | Spirit pluton | |
| Kia(spb) | Cretaceous | acidic intrusive rocks | Spirit pluton, border phase of | |
| Kiaa(m) | Cretaceous | alaskite-aplite-pegmatite | Middle Creek, monzogranite of | |
| Kiaa(sp) | Cretaceous | alaskite-aplite-pegmatite | Spirit pluton | |
| Kiat | Cretaceous | two-mica granite | --- | |
| Kiat(gm) | Cretaceous | two-mica granite | Gleason Mountain, monzogranite of | |
| Kiat(gp) | Cretaceous | two-mica granite | Granite Pass, monzogranite of | |
| Kiat(h) | Cretaceous | two-mica granite | Hall Mountain pluton, granodiorite of Hall Mountain | |
| Kiat(hb) | Cretaceous | two-mica granite | Boulder Mountain pluton, granodiorite of Hall Mountain | |
| Kiat(hh) | Cretaceous | two-mica granite | Harvey Creek pluton, granodiorite of Hall Mountain | |
| Kiat(hl) | Cretaceous | two-mica granite | Loop Creek pluton, granodiorite of Hall Mountain | |
| Kiat(hm) | Cretaceous | two-mica granite | Hungry Mountain, monzogranite of | |
| Kiat(ho) | Cretaceous | two-mica granite | Orwig Hump pluton, granodiorite of Hall Mountain | |
| Kiat(hp) | Cretaceous | two-mica granite | Paupac Creek pluton, granodiorite of Hall Mountain | |
| Kiat(ht) | Cretaceous | two-mica granite | Tillicum Peak pluton, granodiorite of Hall Mountain | |
| Kiat(m) | Cretaceous | two-mica granite | Molybdenite Mountain, granodiorite of | |
| Kiat(r) | Cretaceous | two-mica granite | Reeder Creek, granodiorite of | |
| Kig(s) | Cretaceous | granite | Sand Creek, monzogranite of | |
| Kigd(bg) | Cretaceous | granodiorite | Bunchgrass Meadows, granodiorite of | |
| Kigd(mc) | Cretaceous | granodiorite | Mill Creek, granodiorite of | |
| Kigd(pl) | Cretaceous | granodiorite | Priest Lake, granodiorite of | |
| Kigd(sm) | Cretaceous | granodiorite | Sema Meadows, granodiorite of | |
| Kigd(y) | Cretaceous | granodiorite | Yocum Lake, granodiorite of | |
| KYhm | Cret.-Proterozoic | heterogeneous metamorphic rocks | Flodelle Creek, heterogeneous metamorphic rocks near | |
| Jcg(r) | Jurassic | continental sedimentary deposits, conglomerate | Rossland Group | |
| Jib | Jurassic | basic intrusive rocks | --- | |
| Jmt(r) | Jurassic | metasedimentary and metavolcanic rocks | Rossland Group | |
| Jmv(r) | Jurassic | metavolcanic rocks | Rossland Group | |
| Ju | Jurassic | ultrabasic rocks | --- | |
| TRcb | Triassic | metacarbonate | --- | |
| TRmm | Triassic | marine metasedimentary rocks | --- | |
| PMcb(k) | Permian | metacarbonate | Kettle Falls, carbonate near | |
| PMmm(k) | Permian | marine metasedimentary rocks | Kettle Falls, argillite near | |
| PMmm(r) | Permian | marine metasedimentary rocks | Mount Roberts Formation | |
| CDcb | Carbon.-Devonian | metacarbonate | --- | |
| CDmm | Carbon.-Devonian | marine metasedimentary rocks | --- | |
| CDmt | Carbon.-Devonian | metasedimentary and metavolcanic rocks | --- | |
| CDmv | Carbon.-Devonian | metavolcanic rocks | --- | |
| COcb | Carbon.-Ordovician | metacarbonate | --- | |
| COcg | Carbon.-Ordovician | continental sedimentary deposits, conglomerate | --- | |
| COmm | Carbon.-Ordovician | marine metasedimentary rocks | --- | |
| COmt | Carbon.-Ordovician | metasedimentary and metavolcanic rocks | --- | |
| COmv | Carbon.-Ordovician | metavolcanic rocks | --- | |
| COq | Carbon.-Ordovician | quartzite, low grade | --- | |
| Dcb(l) | Devonian, upper | metacarbonate | Limestone Hill, limestone on | |
| Dcg | Devonian, middle | continental sedimentary deposits, conglomerate | --- | |
| Scg(b) | Silurian | continental sedimentary deposits, conglomerate | Basalt Hill, quartz-granule conglomerate on | |
| Smm | Silurian | marine metasedimentary rocks | --- | |
| Omm(l) | Ordovician | marine metasedimentary rocks | Ledbetter Slate | |
| Omm(r) | Ordovician | marine metasedimentary rocks | Red Top Mountain, argillite on | |
| OCcb(b) | Ordovician-Cambrian | metacarbonate | Metaline Formation, bedded limestone of | |
| OCcb(d) | Ordovician-Cambrian | metacarbonate | Metaline Formation, bedded dolomite of | |
| OCcb(l) | Ordovician-Cambrian | metacarbonate | Metaline Formation, massive limestone of | |
| Ccb(m) | Cambrian | metacarbonate | Maitlen Phyllite, including Reeves Member | |
| Cph(m) | Cambrian | phyllite, low grade | Maitlen Phyllite | |
| CZq(2g) | Cambrian-Proterozoic | quartzite, low grade | Gypsy Quartzite, lower argillite unit of | |
| CZq(3g) | Cambrian-Proterozoic | quartzite, low grade | Gypsy Quartzite, purple quartzite unit of | |
| CZq(4g) | Cambrian-Proterozoic | quartzite, low grade | Gypsy Quartzite, coarse quartzite and argillite of | |
| CZq(5g) | Cambrian-Proterozoic | quartzite, low grade | Gypsy Quartzite, upper argillite unit of | |
| CZq(g) | Cambrian-Proterozoic | quartzite, low grade | Gypsy Quartzite, undivided | |
| PZcb(gl) | Paleozoic | metacarbonate | Gardiner Creek, lower dolomite of | |
| PZcb(gu) | Paleozoic | metacarbonate | Gardiner Creek, upper dolomite of | |
| PZq(g) | Paleozoic | quartzite, low grade | Gardiner Creek, rocks of | |
| Zcb(s) | upper Proterozoic | metacarbonate | Shedroof Conglomerate, Windermere Group | |
| Zcg(s) | upper Proterozoic | continental sedimentary deposits, conglomerate | Shedroof Conglomerate, Winderemere Group | |
| Zib | upper Proterozoic | basic intrusive rocks | --- | |
| Zmm(m) | upper Proterozoic | marine metasedimentary rocks | Monk Formation, Windermere Group | |
| Zmv(l) | upper Proterozoic | metavolcanic rocks | Leola Volcanics, Windermere Group | |
| Zph(s) | upper Proterozoic | phyllite, low grade | Shedroof Conglomerate, Windermere Group | |
| Zq(s) | upper Proterozoic | quartzite, low grade | Shedroof Conglomerate, Windermere Group | |
| Zq(t) | upper Proterozoic | quartzite, low grade | Three Sisters Formation, Windermere Group | |
| Yar(pl) | middle Proterozoic | argillite | Priest River Group, lower argillite | |
| Yar(pu) | middle Proterozoic | argillite | Priest River Group, upper argillite | |
| Ycb(p) | middle Proterozoic | metacarbonate | Priest River Group, carbonate rock of | |
| Ycs(p) | middle Proterozoic | calc-silicate rock | Priest River Group, calc-silicate rock of | |
| Yib(p) | middle Proterozoic | basic intrusive rocks | Purcell sills | |
| Yms(p) | middle Proterozoic | metasedimentary rocks | Prichard Formation, Belt Supergroup | |
| Yms(rb) | middle Proterozoic | metasedimentary rocks | Ravalli Group, Burke Fm., Belt Supergroup | |
| Yms(rr) | middle Proterozoic | metasedimentary rocks | Ravalli Group, Revett Fm., Belt Supergroup | |
| Yms(s) | middle Proterozoic | metasedimentary rocks | Striped Peak Fm., Missoula Group, Belt Supergroup | |
| Yms(sr) | middle Proterozoic | metasedimentary rocks | St. Regis Fm., Ravalli Group, Belt Supergroup | |
| Yms(wl) | middle Proterozoic | metasedimentary rocks | Wallace Formation, lower, Belt Supergroup | |
| Yms(wu) | middle Proterozoic | metasedimentary rocks | Wallace Formation, upper, Belt Supergroup | |
| Yq(p) | middle Proterozoic | quartzite, low grade | Priest River Group, quartzite of | |