Rusinga is widely known for its extraordinarily rich and important fossil beds of extinct Miocene mammals, dated to 18 million years. The island had been only cursorily explored until the Leakey expedition of 1947-1948 began systematic searches and excavations, which have continued sporadically since then. The end of 1948 saw the collection of about 15,000 fossils from the Miocene, including 64 primates called by Louis Leakey “Miocene apes.”
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