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Monzonite group <br />Hornblende - pyroxene monzonite, hornbLende- <br />pyroxene monzonite porphyrfr, and 6tiottite- <br />hornblende-pyroxene monzona to <br />Tdi <br />Diabase, gabbro, lamprophyre, and pyroxenite <br />Pyroxenite is commonly aaeociakd with 6iotik-hones <br />bknde-pyroxene diorlk in Cc.ribou stock <br />Quartz monzonite gtvup <br />Quartz monzonite, quartz monzonite porphyry, biotite- <br />hornbkndc-pyroxene quartz monz<mtite, biotite-horn- <br />bknde-quartz monzonite, hornblende-pyroxene-prartz <br />monzonite, and biotite-quarts mmtzontite porphyry. <br />The ape of the puartz monzonite in :he Bryan <br />Mountain stock is 54 m.y., accordiryL to S. R. Hart <br />in hies 1964 report in the Journal of Geology, <br />v. 7P, p. 493-5Y5 <br />Boulder Creek Granodiorite <br />Gray jive- to medium-grained intrv.aive rocks. Con- <br />aieta mainly of quartz, potassium feldspar, plapio- <br />claee, biotite, and foca!!y hornblende. Contains <br />abundant pegmatite. Dominantly foliated, but in- <br />terior parts of larger bodies are nearly massive <br />METASEDIMENTARY AND <br />METAVOLCANICIiI RDCKS <br />Biotite gneiss <br />Gray ftn.e- to medium-grained mipma.titic biotite gneiss <br />gn b, domtirantly aifLiman{ttic biotik-quartz gneiss, tin- <br />ter!¢yered with biotite-quartz-pLapiocfase gneiss, and <br />biotite-quartz pnetae <br />gn bc, garnet- arzd cordierite-beari ¢p jaciea of ailli~ <br />manioc biotite-quartz gneiss; grades into ailLim¢nitic <br />biotite-quartz gneiss <br />Hornblende gneiss <br />Predominantly amphtiboltite interbe<Ided with biotik- <br />quartz-playiocLase gneiss, microclrae gneiss, locally <br />cafosiiicate pneiae and eordierite amphibole pneiae. <br />The amphi6o(ite is dark-pray to L~lack jive- to me- <br />dium-grained well foliated rock consisting domi- <br />nantly ojhornblende and plapioclaee and, aubordirate <br />amounts of pyroxene, biotite, and quartz <br />Microcline gneiss <br />Liph!-pray or yellowish-pray fire- to medium-grained <br />mticrodine-quartz-plapioelase-biotite gneiss; gener- <br />ally has a well-dq(ined layering; granitic in appear- <br />ance. ` Loca!!y ineludee discontinuous L¢yera qj <br />I <br />1 <br />ml <br />A <br />1 <br />Di <br />A ~ <br />~I <br />~' <br />AI <br />m <br />n <br />D <br />3I <br />A, <br />DI <br />ZI <br />