CONTENTS
Page [Introduction] 5 [The Prehistoric Record] 5 [Varieties of Fossils] 8 [Fossilization] 9 [Floras and Faunas] 13 [Formations] 16 [Geological Time] 18 [Explanation of the Time Chart] 23 [The Geological Section] 25 [Before the Age of Reptiles] 31 [The Pre-Cambrian Complex] 31 [Cambrian Life] 33 [The Ordovician Record] 35 [Silurian Events] 36 [Devonian Progress] 37 [Carboniferous Forests] 40 [Permian Hardships] 43 [The Age of Reptiles] 47 [Dinosaurs] 48 [Plant Life and Climate] 56 [Coal and Fossil Footprints] 57 [Mesozoic Invertebrates] 58 [Extinct Birds] 60 [Ancestors of the Mammals] 61 [The Age of Mammals] 64 [Prehistoric Horses] 70 [Mastodons and Mammoths] 80 [The Rancho La Brea Fossil Pits] 88 [The Age of Man] 93 [Supplementary Reading] 95
LIST OF ILLUSTRATIONS
Page [At Work on a Dinosaur Skeleton] 2 [Fossil Bones in Rock Formation] 7 [Insect Fossils] 10 [Restoration of Rhinoceros] 12 [Dinosaur Tracks] 17 [Time Chart] 22 [Geological Section Showing Positions of Formations] 26 [Marine Beds of the Benton Formation] 28 [Plesiosaur Bones in Place] 28 [Invertebrate Fossils] 34 [Modernized Fishes] 38 [Prehistoric Plants] 41 [Marine Reptiles] 46 [Diplodocus] 49 [Trachodon] 51 [Stegosaur] 52 [Sea Turtle] 54 [Murals, Hall of Mammals] 63 [Uintatheres and Contemporary Life] 65 [Moropus] 67 [Titanotheres] 69 [Oligocene Mammals] 71 [Pleistocene Horse] 73 [Structure of Molar Teeth] 75 [Grazing Type of Molar Teeth] 77 [American Mastodon] 79 [Long-Jawed Mastodont] 81 [Molar Tooth of Mammoth] 83 [Nebraska Mammoth] 85 [Rancho La Brea Fossils] 87 [Folsom Bison] 90 [Man and Mammoth] 92