Zinj Keychain resin cast skull about 1 3/4 inches tall by 1 3/8 inches wide. "On July 17, 1959 paleoanthropologist Mary Leakey discovered a fossilized skull from a previously unknown species of hominid that she and husband Louis Leakey named Zinjanthropus boisei. The 1.75-million-year-old fossil from Olduvai Gorge, Tanzania, turned the Leakey's into household names, and firmly established that the roots of the human family tree extended deep into antiquity. The name of the genus "Zinjanthropus" has since been dropped." Archaeology 8/3/2009.