TABLE OF CONTENTS The Belt sea and its inhabitants Landscapes after the overthrusting Appendix A. Age and character of the rock units of Glacier National Park and vicinity B. Approximate geologic time scale C. Classification of fossil algae D. Key to the identification of fossil algae E. Glossary Index (omitted from the online edition) ILLUSTRATIONS PLATE 51. Shaded relief map of Glacier National Park. (omitted from the online edition) 52. Map of northwestern Montana, showing the principal topographic features and the outlines of quadrangles that have been topographically surveyed in and near Glacier National Park. (omitted from the online edition) 53. Block diagrams illustrating stages in the development of the Lewis overthrust. (omitted from the online edition) FIGURE 122. Gunsight Pass and Mount Jackson 123. Collenia frequens Walcott in the Collenia frequens zone, near Appekunny Falls 124. The Garden Wall, as seen from the top of Mount Oberlin 125. Mass of Conophyton inclinatum Rezak in Conophyton zone 1, on Going-to-the-Sun Highway, 6.4 miles west of Logan Pass 126. Cryptozoon occidentale Dawson in Missoula group, in railroad cut about 3 miles southeast of Nyack 127. Collenia multiflabella Rezak in Collenia multiflabella zone, on east side of Logan Pass 128. Inclusionlike patterns etched in Siyeh limestone, in road cuts northwest of Logan Pass 129. "Molar tooth" structures, in road cuts northwest of Logan Pass 130. Sill in Siyeh limestone on east face of Mount Gould, as seen from Cataract Mountain 131. View of Pollock Mountain and the headwaters of Cataract Creek, showing two sills in Siyeh limestone, as seen from the southwest flank of Allen Mountain 132. Collenia undosa Walcott in Collenia undosa zone, in cirque facing Logan Pass between Mount Oberlin and Claments Mountain 133. Collenia symmetrica Fenton and Fenton in Collenia symmetrica zone 2, at Great Northern Railway tracks along Bear Creek 134. Conophyton inclinatum Rezak in Conophyton zone 2, along Great Northern Railway tracks near juncture of Devil Creek and Bear Creek 135. Conophyton inclinatum Rezak in Conophyton zone 2, along Great Northern Railway tracks near juncture of Devil Creek and Bear Creek 136. Collenia frequens Walcott in Conophyton zone 2, at top of Running Rabbit Mountain 137. Folded rocks of the Belt series on McPartland Mountain, as seen from the trail to Sperry Glacier 138. Contorted quartzite in the Grinnell argillite, Two Medicine Pass 139. The Lewis overthrust on Summit Mountain, as seen from Marias Pass 140. Chief Mountain from the northeast, as seen from the East Fork of Lee Creek 141. View west across St. Mary River valley toward Yellow Mountain and Chief Mountain, showing the very irregular eastern margin of the Lewis Range 142. A stage in the development of the present topography in Glacier National Park: Topography after the Blackfoot surface had formed 143. A stage in the development of the present topography in Glacier National Park: Topography at about the middle of Pleistocene time, early in the stage of accelerated erosion that preceded the main Wisconsin glacial advance 144. A stage in the development of the present topography in Glacier National Park: Topography at the present time
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