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March 26th, 2006 at 1:06 pm

Missing Link Found?

Scientists in northeastern Ethiopia said
Saturday that they have discovered the skull of a small human ancestor
that could be a missing link between the extinct Homo erectus and
modern man.

The hominid cranium — found in two pieces and
believed to be between 500,000 and 250,000 years old — "comes from a
very significant period and is very close to the appearance of the
anatomically modern human," said Sileshi Semaw, director of the Gona
Paleoanthropological Research Project in Ethiopia.

Archaeologists found the early human cranium five weeks ago at Gawis in Ethiopia’s northeastern Afar region, Sileshi said.

Several
stone tools and fossilized animals including two types of pigs, zebras,
elephants, antelopes, cats, and rodents were also found at the site.

The image “http://news.bbc.co.uk/olmedia/325000/images/_326037_skull150.jpg” cannot be displayed, because it contains errors.Sileshi,
an Ethiopian paleoanthropologist based at Indiana University, said most
fossil hominids are found in pieces but the near-complete skull — a
rare find — provided a wealth of information.

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"The Gawis cranium
provides us with the opportunity to look at the face of one of our
ancestors," the archaeology project said in a statement.

Homo
erectus, which many believe was an ancestor of modern Homo sapiens, is
thought to have died out 100,000 to 200,000 years ago.

The
cranium dates to a time about which little is known — the transition
from African Homo erectus to modern humans. The fossil record from
Africa for this period is sparse and most of the specimens poorly
dated, project archaeologists said.

The face and cranium of the
fossil are recognizably different from those of modern humans, but bear
unmistakable anatomical evidence that it belongs to the modern human’s
ancestry, Sileshi said.

The image “http://news.nationalgeographic.com/news/2004/11/images/041118_ape_ancestor.jpg” cannot be displayed, because it contains errors."A good fossil provides anatomical
evidence that allows us to refine our understanding of evolution. A
great fossil forces us to re-examine our views of human origins. I
believe the Gawis cranium is a great fossil," said Scott Simpson, a
project paleontologist from Case Western Reserve University School of
Medicine at Cleveland, Ohio.

Scientists conducting surveys in the Gawis River drainage basin found the skull in a small gully, the project statement said.

"This
is really exciting because it joins a limited number of fossils which
appear to be evolutionary between Homo erectus and our own species Homo
sapiens," said Eric Delson, a paleoanthropologist at Lehman College of
the City University of New York, who was not involved in the discovery
but has followed the project.

Homo erectus left Africa about 2
million years ago and spread across Asia from Georgia in the Caucasus
to China and Indonesia. It first appeared in Africa between 1 million
and 2 million years ago.

Between 1 million and perhaps 200,000
years ago, one or more species existed in Africa that gave rise to the
earliest members of our own species Homo sapiens — between 150,000 and
200,000 years ago.

The image “http://www.msgr.ca/msgr-humour/missing_link_cl.gif” cannot be displayed, because it contains errors.Delson said the fossil found in Ethiopia
"might represent a population broadly ancestral to modern humans or it
might prove to be one of several side branches which died out without
living descendants."

cnn.com

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