Category: Science - Earth/Agricultural/Farming
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 O...
Second in importance among the animals of the period were the brachiopods or lamp-shells, not true mollusks although they were provided with similar shells composed of calcium p...
2. Part 2Some of the rock layers will be rich in plant and animal remains, others quite barren, the difference being due partly to conditions influencing the life of the region. In addit...
3. Part 3The whole of geological time has been divided and subdivided according to varying practices. The development of life is perhaps the one outstanding feature of the time divisions...
7. Part 7_Eohippus_, the “dawn horse” as it has been called, is one of the oldest and best known of the American horses. Its relation to existing members of the family can be traced by m...
5. Part 5The most successful of Permian land animals were the peculiar reptiles that learned to live in drier regions. Like the horned toad and Gila monster of our arid southwestern Unit...
6. Part 6As in other eras, the invertebrates fluctuate with the periods. Characteristic forms appear, become more or less prominent, then in many cases decline or disappear. Variations a...
1. Part 1Page 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 Ge...
8. Part 8Other skeletons include the saber-tooth tiger, characterized by the long curved upper canine teeth which undoubtedly were used for stabbing and slashing, and the dire wolf, the...