Life-Histories of African Game Animals Author:Theodore Roosevelt General Books publication date: 2009 Original publication date: 1914 Original Publisher: C. Scribner's Sons Subjects: Mammals Juvenile Nonfiction / Animals / Mammals Nature / Mammals Science / Life Sciences / Zoology / General Science / Life Sciences / Zoology / Mammals Notes: This is a black and white OCR reprint of the original... more ». It has no illustrations and there may be typos or missing text. When you buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: CHAPTER II DERIVATION OF THE FAUNA, GEOGRAPHICALLY AND PALEONTOLOGICALLY A -- Geologic Formation The greater part of the area comprised in British East Africa and Uganda is of Archaean age, being gneissic in structure and derivation. All of the desert lowlands and the higher grass-lands which flank them are comprised in the gneissic area, together with the hills and mountains which rise above them, including the lofty fault range of Ruwenzori. Capping the central portion of the Archaean region we find a more recent volcanic or eruptive rock series composed of various lavas. The whole highland region of both East Africa and Uganda, including the lofty volcanoes of Kenia, Elgon, and Kilimanjaro, are of this formation. The Rift Valley has been the most recent source of the lava cap which covers the highlands. The lavas of this age have been erupted from fissures in the vicinity of the Rift Valley, which comparatively recently formed a great arch of eruptive rock, from the apex of which the lava flowed east and west over the gneissic region. Later the central portion of the arch dropped a few thousand feet, forming the great rift, now known as the Rift Valley. Muff in his account of the geology of British East Africa has described this formation as the"falling of the keystone" of the great lava arch. Previous to this other masses of lava poured from the volcanic centres of Kenia, Elgon, and Kiliman...« less