Abstract
Introduction
Summary of general geology
Precambrian rocks
Metasedimentary rocks
Amphibolite and related rocks
Migmatite
Microcline gneiss
Biotite gneiss and schist
Amphibolite
Sillimanitic biotite gneiss and schist
Hornblende gneiss
Igneous rocks
Boulder Creek Granite
Silver Plume Granite
Pegmatite and aplite
Relative age and origin of the Precambrian rocks
Metasedimentary rocks
Granite
Paleozoic and Mesozoic sedimentary rocks
Maroon and Lykins Formations
Entrada(?) Sandstone
Morrison Formation
Dakota Group
Benton Shale
Niobrara Formation
Pierre Shale
Tertiary igneous rocks
Montezuma Quartz Monzonite and associated aplitic rock
Quartz monzonite
Aplitic rock
Dikes
Augite and hornblende diorite
Latite porphyry
Rhyolite porphyry
Age
Surficial deposits
Structure
Precambrian structural features
Folds
Faults
Frey Gulch shear zone
Montezuma shear zone
East Portal shear zone
Igneous rocks
Laramide structural features
Folds
Faults
Joints
Veins and wallrock alteration
Summary of structural geology
References cited
Index.