As far as i know there have not been any dinosaur finds in somalia for obvious reasons, although i'm not sure about ethiopia or kenya. However apparently the largest dinosaur species lie beneath East african land and knowing our luck we probably have many of these giant behemoths lying beneath our land just waiting for an opportunity to be dug out. According to this book the dinosaurs that inhabited the east african region were twice as large as the diplodocus which is 80ft long.
https://www.jstor.org/stable/199274?seq=2#metadata_info_tab_contents
https://www.jstor.org/stable/199274?seq=2#metadata_info_tab_contents
