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Ol Introduction  1 Location 2 Fieldwork and acknowledgments 2 Scope of report-. 2 Geologic setting.. 2 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___ 11 Igneous rocks_  11 Boulder Creek Granite and the quartz monzonite_ -__-__---_----_--_-_---_-11 Boulder Creek Granite. 12 Quartz monzonite-___-____-____ 12 Hornblende diorite and hornblendite.  13 Pegmatite and aplite---_-__-__-_--_ 13 Cataclastic rocks_ --____--_-__-__-__----_ 14 Augen gneiss__-__----_-__---_-__----_ 14 Cataclastic gneiss-____-____-____-___-__--__14 Structural geology._---___----_-___-_---__ 14 Structural features. 14 Three periods of deformation__--__ 15 Orientation of lineations 16 Metamorphism related to structural and igneous history  21 Conclusion._  -__---__-__-____ 22 Literature cited-_-__-__-__--_--_--_-_ 22 Index. .-_-_--_-__ 25

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