Canyon 33

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