Geological Survey Bulletin 1229 Geology of the Circle Cliffs Area, Garfield and Kane Counties, Utah

Cover

Abstract

Introduction

Location and extent of area
Geography and physiography
Previous work
Purpose and scope
Field methods
Acknowledgments

Stratigraphy

Permian System
     Cutler Formation
     Kaibab Limestone
Permian-Triassic unconformity
Triassic System      Moenkopi Formation
          Basal unit
          Sinbad Limestone Member
          Lower ledge-forming unit
          Slope-forming unit
          Upper ledge-forming unit
     Chinle Formation
          Mottled-siltstone unit
          Shinarump Member
          Alteration associated with the Shinarump Member
          Monitor Butte Member
          Petrified Forest Member
          Owl Rock Member
          Church Rock Member
Triassic and Jurassic Systems
     Glen Canyon Group
          Wingate Sandstone
          Kayenta Formation
          Navajo Sandstone
Jurassic System
     San Rafael Group
          Carmel Formation
          Entrada Sandstone
          Curtis(?) Formation
          Summerville Formation
     Morrison Formation
          Salt Wash Sandstone Member
          Brushy Basin Shale Member
Cretaceous System
     Dakota Sandstone
     Mancos Shale
          Tununk Shale Member
          Ferron Sandstone Member
          Blue Gate Shale Member
          Emery Sandstone Member
          Masuk Member
     Mesaverde Formation
Tertiary and Quaternary Systems
     Bouldery deposits
     Pediment deposits and pediments
     Terrace gravel
     Landslide deposits
     Older alluvium in Hall Creek
     Fan deposits
     Talus
     Stream alluvium
     Windblown-sand deposits

Structure

Method of representing structure
Circle Cliffs anticline
Henry Mountains syncline
Faults
Joints
Periods of deformation

Uranium deposits

General character and distribution
Mineralogy of deposits
Relation of asphalt to uranium deposits
Correlation of tectonic structure and uranium deposits
Criteria and origin of uranium deposits
Future of the area

Principal prospects

Buff and Red Cliff prospects
Cool prospect
Bart, Centipede, and Midas prospects
Horsehead prospect
Blue Goose prospect
Horse Canyon prospect
Stud Horse prospect
Glen Rae prospect
Blue Bird prospect
Lone B prospect
Black Widow prospect
Mesa prospect
Yellow Jacket prospect
Hotshot prospect
Sneaky-Silver Falls prospect
Duke prospect
Sun Dog prospect
Betty Jack prospect
Rainy Day mine and Rocky Mountain Co. prospects
Copperhead prospect
Hope prospect
Zelda prospect
Three Pardners prospect
Dodie prospect
Red Head prospect
Moqui prospect
Olympic prospect
Dream prospect
Solitude prospect

Metalliferous deposits other than uranium

Manganese
Selenium
Titanium

Stratigraphic sections

Literature cited

Index (omitted from the online edition)

PLATE

1. Geologic map of the Circle Cliffs area (omitted from the online edition)

2. Tectonic map of part of the Circle Cliffs area (omitted from the online edition)

FIGURE

1. Indexed relief map showing location of the Circle Cliffs area

2. Photographs showing Triassic rocks in southeast Circle Cliffs

3. Map showing distribution of Sinbad Limestone Member of the Moenkopi Formation

4. Map showing distribution of asphalt in the Moenkopi Formation

5. Photographs showing upper ledge-forming unit of the Moenkopi Formation

6. Map showing distribution of the mottled-siltstone unit of the Chinle Formation

7—13. Photographs showing:

14. Map showing uranium prospects and distribution and channel pattern of the Shinarump Member

15. Map of Centipede prospect

16. Map of Stud Horse prospect

17. Photographs showing prospect localities in typical channels filled with Shinarump Member of the Chinle Formation

18. Map of Yellow Jacket prospect

19. Map of Betty Jack prospect

20. Map of Dream prospect

TABLE

1. Uranium and organic carbon at the Rainy Day mine

2—6. Analyses of uranium content in samples from:

7. Analyses of uranium and selenium in samples from the Solitude prospect

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Stratigraphy, structure, and economic geology of an area at the west edge of the Colorado Plateau

UNITED STATES DEPARTMENT OF THE INTERIOR
STEWART L. UDALL, Secretary

GEOLOGICAL SURVEY
William T. Pecora, Director

Library of Congress catalog-card No. GS 67-266

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