File:The American Museum journal (c1900-(1918)) (17973021590).jpg

Title: The American Museum journal
Identifier: americanmuseumjo13amer (find matches)
Year: c1900-(1918) (c190s)
Authors: American Museum of Natural History
Subjects: Natural history
Publisher: New York : American Museum of Natural History
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: Biodiversity Heritage Library

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338 THE AMERICAN MUSEUM JOURNAL mud brought down into a large basin by a huge river such as the Amazon. Besides being of great extent, this deposit is also of great thickness, in some parts probably as much as 10,000 feet thick. If you look upon this area as a series of rocks 10,000 feet thick and 200,000 square miles in area, and imagine it the face of a book of the history of the world, you see that it is simply a matter of our turning over the pages. There is not another part of the world that will give the records so com- pletely — a continuous record of the land animals of the world for about three million years. Sometimes we cannot read the record clearly but we can make out most of it. This period is not only very fully recorded but there is no period of the world's history so interesting except the period when man came upon the earth. It is a period when crocodiles, lizards,
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Galepus jouberti Broom, one-half natural size. A complete skeleton of a small member of the Dromasaurians, one of the earliest of the mammal-like reptiles. The head (at the left below) is folded back so that in this photograph it is seen very obliquely but with care all the rest of the skeleton may be easily traced turtles and reptiles appeared for the first time; and the study of the records shows us the warm-blooded four-footed forms in the process of evolution. The greater part of the Karroo formation lies in the center of Cape Colony. This large area has a scanty rainfall of from five to fifteen inches in the year but as most of the rainfall is due to thunder-storms during a short period, there are usually nine months in which no rain falls, and the vegetation is almost entirely composed of low Karroo bushes. The whole scenery is in many ways strikingly similar to that of Arizona. There are extensive plains that are almost dead level produced by the action of wind

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