الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
This thesis is to shed light on a very important order magnificent in its diversification not only in Egypt, but also in the whole continent especially Kenya. That order deserves to be considered one of the important orders of class mammalia. The present thesis depends on paleontological studies of the hyracoid fossils, which have been collected by various scientific missions and deposited in the Egyptian Geological Museum and Natural Kenyan Museum of Kenya besides studying the formations of Birket Qarun, and Gabal Qatrani in Fayum depression, Egypt, and Nakwai, Benson’s Site, Kenya. from the beginning of the appearance of order Hyracoidea until now, there are at least twenty one genera has been identified and described, ten of them were discovered in the formations of Fayum, while the rest are distributed all over the continents of Asia and rest of Africa. This thesis contained two new species and first record of species in older stage. The thesis is considered the first thesis in the Egyptian universities that deal with the hyracoid fossils of Fayum and Kenya through dealing with the evolution of genus Thyrohyrax that extended from earliest late Eocene to late Oligocene. The study answers about the research questions and try to explain the role of hyracoids communities in biostratigraphy, how the change of lineage of Thyrohyrax species (dental teeth) can be used to define different stratigraphic sections, and how genus Thyrohyrax can help in building a record of the evolution of Paleogene hyracoids in Africa. Besides understanding the paleoecology and paleodieting of order Hyracoidea in the Paleogene depending on studying 331 specimens and studying the methods that has been used to collect its fossils in the field then how it has been prepared in the lab. The thesis includes nine chapters, 53 figures, 9 Tables, 19 plates and 108 references.