Geological Survey Bulletin 1021-I Geology of Devils Tower National Monument, Wyoming

Cover

Abstract

Introduction

Geology

Tower
Sedimentary rocks
   Spearfish formation
   Gypsum Spring formation
   Sundance formation
      Stockade Beaver shale member
      Hulett sandstone member
      Lak member
      Redwater shale member
Stream terrace deposits and alluvium
Talus and landslide material
Structure

Geologic history

Origin of Devils Tower

Selected bibliography

PLATE

30. Geologic map and section of the Devils Tower National Monument, Wyo

FIGURES

52.—Index map showing location of Devils Tower National Monument

53A.—Northwest side of Devils Tower showing how the columns taper or converge and in places unite near the top and are cut by numerous cross-fractures

53B.—South side of Devils Tower showing the columns flaring out and merging to form the massive base

54.—Generalized section of the sedimentary rocks of the Devils Tower National Monument