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According to the information in the passage, the earliest known dinosaur Sereno found ........... .
One fossil discovery after another gave University of Chicago professor Paul Sereno a reputation for
having extraordinary luck. Sereno's "luck" was due in part to his willingness to go wherever the bones
might be, however difficult and remote the site. His discoveries helped him piece together the family
tree of dinosaurs. Sereno's discoveries began during graduate school. In 1984, as the first American
graduate student of paleontology to study in China, he identified two new dinosaur species among the
bones in Chinese fossil archives. When Chinese authorities rejected his application to dig in the Gobi
desert of Mongolia, he took his request to a local official in Mongolia. Sereno explained in French that
he wanted to hunt for the bones of big animals. The confused official admitted him under provisions
for big-game hunters but offered little hope of finding much game in the desert. Sereno used his
findings in China and Mongolia to make a family tree of the ornithischian, or bird-hipped, dinosaurs,
one of the two main orders of dinosaurs. He based his work on careful comparison of details of
various skeletons. The discovery that made Sereno famous came in 1988, the year after he completed
his doctorate and joined the faculty at the University of Chicago. In a dry, dusty Argentina valley
among sediments 225 million years old; he found the skull and a nearly complete skeleton of a
Herrerasaurus, which, at the time, was the oldest dinosaur ever discovered. Less than a mile away
three years later, Sereno found the complete skeleton of a 228-million-year-old dinosaur, which he
named Eoraptor. Only six feet long, with sharp teeth and long claws, this earliest known dinosaur
looked like a miniature version of Tyrannosaurus rex. It confirmed that dinosaurs began as small,
meat-eating animals that walked and ran on their hind legs. Sereno was the first person to conduct
extensive searches for dinosaur fossils in Africa. Governmental red tape and conditions in the Sahara
desert made his expeditions to Niger in-1993 and Morocco in 1995 two of his most-gruelling, but also
most rewarding.