TABLE OF CONTENTS
PAGE [Introduction] ix [Chapter I—The Archean Era] 1 [The Earth’s Oldest Rocks, Grand Canyon] 2 [Granite in Grand Canyon] 4 [Chapter II—The Algonkian Era] 5 [Algonkian Rocks in Grand Canyon] 5 [Formation of Mountains] 6 [Early Climates] 6 [Oldest Known Life] 7 [Chapter III—The Paleozoic Era] 9 [First Animal Life—The Tonto Rocks] 9 [The Missing Periods of the Third Era] 11 [The Age of Fish] 12 [Sea Life From the North—Redwall Limestone] 12 [Tracks in the Supai Sandstone] 14 [Landscapes of the Hermit Shale] 15 [Wind-blown Sand—The Coconino Sandstone] 17 [Warm Seas from the West—The Toroweap and Kaibab Formations] 18 [Chapter IV—The Mesozoic Era] 21 [Remnants of Younger Strata—Red Butte and Cedar Mountain] 21 [The Petrified Forest] 22 [Dinosaur Tracks—The Painted Desert] 24 [The Rocks of Zion Canyon and Rainbow Natural Bridge] 26 [From Seashells to Coalbeds] 27 [Chapter V—The Cenozoic Era] 29 [Bryce Canyon Formation] 30 [A Great Erosion Surface] 32 [Crustal Movement at Grand Canyon] 33 [Cutting the Grand Canyon] 34 [The Forming of Zion Canyon] 37 [Glaciers] 38 [San Francisco Mountain Volcanic Field] 39 [Elephants and Camels] 41 [Advent of Man in the Southwest] 42 [Bibliography] 45
ILLUSTRATIONS
PAGE [The Grand Canyon] Frontispiece [Diagrammatic Sections of Grand Canyon Region] x [Rocks of First Era, Inner Gorge of Grand Canyon] 1 [Block Diagrams of Events of First Era] 3 [Tilted Rocks of the Second Era, Grand Canyon] 5 [Diagrammatic Section of Third Era Formations, Grand Canyon] 8 [Scene on Cambrian Sea Floor in Grand Canyon Region] 10 [Trilobites Preserved in Green Shale of Grand Canyon Walls] 11 [A Fresh-water Fish of Devonian Age (Sketch)] 12 [Sea Life from the Redwall, Grand Canyon (Sketches)] 12 [Havasu Falls in Redwall Limestone, Grand Canyon] 13 [Tracks of Short-legged, Prehistoric Animal, Supai Formation, Grand Canyon] 14 [Landscape at Time Hermit Shale was Forming] 15 [Fossil Fern From the Hermit Shale, Grand Canyon] 15 [Wind-blown Sand, Coconino Formation, Grand Canyon] 17 [Tracks of Primitive Four-footed Animals, Coconino Sandstone, Grand Canyon] 17 [Marine Life From the Kaibab Limestone, Grand Canyon (Sketches)] 18, 19 [Diagrammatic Section of Fourth Era Formations, Southern Utah and Painted Desert Regions] 20 [Cedar Mountain] 22 [Red Butte] 22 [Petrified Forest, Arizona] 23 [Petrified Logs of Triassic Age] 23 [Dinosaur Tracks, Painted Desert] 24 [The Painted Desert] 25 [Zion Canyon, Navajo Sandstone] 26 [Rainbow Natural Bridge, Navajo Sandstone] 26 [Cretaceous Shells From Southern Utah (Sketches)] 27 [Coal Canyon, Painted Desert Country] 28 [Bryce Canyon] 30 [Map of Colorado River] 31 [A Great Erosion Surface] 32 [Diagrammatic Cross Sections of Grand Canyon] 35 [The Grand Canyon] 36 [Zion Canyon] 37 [Chart of San Francisco Mountains] 39 [San Francisco Mountain—Past and Present (Sketch)] 40 [Map of San Francisco Mountain Volcanic Field] 40 [San Francisco Mountain] 41 [Elephant and Camel Remains] 42 [Ancient Indian Petroglyphs, Head of Bright Angel Trail, Grand Canyon] 43