  - 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
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