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1964•USGS professional paperOpen access

Relationship of Precambrian quartzite-schist sequence along Coal Creek to Idaho Springs Formation, Front Range, Colorado

J. D. Wells, Douglas M. Sheridan, A. L. Albee

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Abstract

General geology________________________________ 2 Nomenclature of Precambrian rocks_______________ 4 Distribution and stratigraphy of the metasedimentary and metavolcanic(?) rocks_____________________________ 4 Metamorphic grade_________________________________ 5 Metasedimentary and metavolcanic(?) rocks_______ 5 Microcline -quartz -plagioclase -biotite gneiss (microcline gneiss)________________________ 5 Hornblende gneiss__________________________ 6 Microcline -quartz -plagioclase -biotite gneiss and hornblende gneiss (microcline gneiss and hornblende gneiss)________________________ 6 Mica schist-----_-_____-___________________ 6 Biotite-quartz-plagioclase gneiss and mica schist (biotite gneiss and mica schist)_____________ 7 Quartzite __________________________________ 7 Metamorphic grade Continued Page Metasedimentary, etc. Continued Schist layers in quartzite^_______------__-_-_ O9 Calcium silicate rocks with schist in quartzite___ Igneous rocks_ ________________________________ Boulder Creek Granite and the quartz monzo-nite_ __________-__-__---_

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General geology________________________________ 2 Nomenclature of Precambrian rocks_______________ 4 Distribution and stratigraphy of the metasedimentary and metavolcanic(?) rocks_____________________________ 4 Metamorphic grade_________________________________ 5 Metasedimentary and metavolcanic(?) rocks_______ 5 Microcline -quartz -plagioclase -biotite gneiss (microcline gneiss)________________________ 5 Hornblende gneiss__________________________ 6 Microcline -quartz -plagioclase -biotite gneiss and hornblende gneiss (microcline gneiss and hornblende gneiss)________________________ 6 Mica schist-----_-_____-___________________ 6 Biotite-quartz-plagioclase gneiss and mica schist (biotite gneiss and mica schist)_____________ 7 Quartzite __________________________________ 7 Metamorphic grade Continued Page Metasedimentary, etc. Continued Schist layers in quartzite^_______------__-_-_ O9 Calcium silicate rocks with schist in quartzite___ Igneous rocks_ ________________________________ Boulder Creek Granite and the quartz monzo-nite_ __________-__-__---_

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General geology________________________________ 2 Nomenclature of Precambrian rocks_______________ 4 Distribution and stratigraphy of the metasedimentary and metavolcanic(?) rocks_____________________________ 4 Metamorphic grade_________________________________ 5 Metasedimentary and metavolcanic(?) rocks_______ 5 Microcline -quartz -plagioclase -biotite gneiss (microcline gneiss)________________________ 5 Hornblende gneiss__________________________ 6 Microcline -quartz -plagioclase -biotite gneiss and hornblende gneiss (microcline gneiss and hornblende gneiss)________________________ 6 Mica schist-----_-_____-___________________ 6 Biotite-quartz-plagioclase gneiss and mica schist (biotite gneiss and mica schist)_____________ 7 Quartzite __________________________________ 7 Metamorphic grade Continued Page Metasedimentary, etc. Continued Schist layers in quartzite^_______------__-_-_ O9 Calcium silicate rocks with schist in quartzite___ Igneous rocks_ ________________________________ Boulder Creek Granite and the quartz monzo-nite_ __________-__-__---_

Key concepts: Schist, Precambrian, Geology, Front (military), Geochemistry, Sequence (biology), Mining engineering, Coal

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Relationship of Precambrian quartzite-schist sequence along Coal Creek to Idaho Springs Formation, Front Range, Colorado — Research Paper | ScholarLens