The earliest identified species (Sinodelphys szalayi) is known from 125-million-year-old fossils found in China.
The scientists have used isotopic dating to determine how old the fossils are.
BBC: Fossil finds in Leicestershire 'absolutely world class'
Some researchers think Homo erectus evolved in East Africa, where many of the oldest fossils have been found, but the discovery in the 1990s of equally old Homo erectus fossils in the country of Georgia has led others to suggest an Asian origin.
You don't have to squint too hard to picture a 10-year-old Myhrvold scrabbling for fossils in the canyons of the Santa Monica, Calif. mountains, his bored mother waiting helplessly on the hillside.
The only previously known examples were fossils which were 175 million years old.
Using wires, pieces of metal sheeting and circuit boards, artist Peter McFarlane transforms old circuit boards into amazing computer-age fossils that somehow look prehistoric.
Under a desert sun, to a backdrop of the Andes Mountains, scientists teach sponsors to read a landscape that is 100 million years old and to recognize, via texture and colour, fossils in the prehistoric rock.
Heritage brokered the T. bataar on behalf of a thirty-seven-year-old bone hunter named Eric Prokopi, who lives in Florida, a great state for fossils.
Both of these fossils suggest such transitions are not smooth, simultaneous transformations of all bodily features from old to new.
The results show the Peking Man fossils came from ground layers that were 680, 000-780, 000 years old, making them about 200, 000 years older than had previously been believed.
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