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