CHAPTER IV
TWO PREHISTORIC CEMETERIES—GIANT REPTILES AND GIANT TREES
Although reptiles appeared first in the period known as the Carboniferous Age, or age of plant life, they did not attain their greatest development until Jurassic and Cretaceous times, when many were of prodigious size and ruled the world. The gigantic ichthyosaurs, mesosaurs, and dinosaurs held dominion over the sea and land, and the monster flying reptile, the pterodactyl, over the air.
Ages ago a great inland sea embracing Wyoming and the surrounding region occupied the area east of the Rocky Mountains. For many years students of geology had found this section a fertile field for the study of rock formations and the collection of fossils; but not until 1898 was the geological wonderland of central-south Wyoming discovered.
This discovery proved to be a graveyard of prehistoric monsters dating back probably several millions of years ago. Entombed in the rocks of the Jurassic and Cretaceous periods, many lizard-like animals of gigantic size called saurians were found. Several fossil skeletons of these animals have been chiselled out of the solid rocks and mounted in museums, the work entailing a vast amount of labor and expense. The discovery was made by Mr. Walter Granger, who had been sent out by the American Museum of Natural History, of New York, to hunt for fossils.
In the desert section near Medicine Bow River, Wyoming, he found what seemed to be a number of dark-brown bowlders. On a critical examination they proved to be ponderous fossils that had been washed out of a great bed of reptilian remains. The fossil graveyard in question was found to be two hundred and seventy-five feet in thickness. Near by was a Mexican sheep-herder's cabin, the foundations of which were constructed of huge fossils. The vicinity was christened Bone Cabin Quarry. Ten miles south of the Bone Cabin Quarry, in the Como Bluffs, another bed containing the remains of huge dinosaurs was discovered. From these remarkable cemeteries many fossils have been obtained.
The term saurian means "lizard," and it has many prefixes to indicate the different genera and species. The prefixes generally express to a certain extent the characteristic appearance or habits of the different kinds of saurians. Some were flesh-eaters; others were herbivorous. Some lived on land; others, in the shallow waters and lagoons, fed on succulent aquatic plants; still others frequented the deeper waters and lived on fish.