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Science Forum Index » Miscelaneous » Human fossils set European record
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| Garrison Hilliard |
 Posted: Tue Sep 23, 2003 9:59 am |
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Human fossils set European record
By Jonathan Amos
BBC News Online science staff
Fossils picked up in a Romanian bear cave are the oldest specimens yet found of
modern humans in Europe, scientists say.
One of the items - a male, adult jawbone - has been dated to be between 34,000
and 36,000 years old.
The other pieces, which include the facial bone of an adolescent, are still
being tested but are thought to be of a similar age.
This puts the fossils - from three different individuals - in a period in
history when modern humans are believed to have shared the continent with
Neanderthals, their now extinct hominid cousins.
Indeed, the researchers reporting the discoveries go so far as to suggest the
fossils show some degree of hybridisation - they are possibly the result of
interbreeding between modern humans and Neanderthals, they argue.
This is a position that drives a heated debate among scientists, many of whom
doubt there was much mixing of the species.
These researchers point to DNA studies that indicate Neanderthals contributed
little or nothing to the genes of humans living today.
Human development
The new finds, made in the Carpathian Mountains, are sure to prompt further
argument.
They are detailed by Professor Erik Trinkaus and colleagues in two journals: the
Proceedings of the National Academy of Sciences and the Journal of Human
Evolution.
The team says the fossils, while undeniably modern ( Homo sapiens ), display
some features that are very primitive in nature, such as large molars.
"Both the lower jawbone and the upper jaw of the face have the same pattern in
the cheek teeth - the wisdom teeth in particular are simply huge. They are
bigger than just about anything else we have from the last 200,000 years,"
Professor Trinkaus told BBC News Online.
"The best explanation I can put on it is that when modern humans spread out of
Africa, they interbred with local populations of archaic humans, including the
Neanderthals," said the Mary Tileston Hemenway Professor of Anthropology at
Washington University in St Louis, US.
"It shows us that the earliest 'modern Europeans' were considerably less modern
than we normally consider them to be, and that significant human evolution in
details of anatomy has taken place since they became established across
Eurasia."
'Wonderful mosaic'
The fossils were originally discovered in February 2002 in Pestera cu Oase -
translated as the "Cave With Bones" - by three Romanian cavers.
It is not known how they got into the cave, but Professor Trinkaus says one
possibility is that early humans used the site as a mortuary for the ritual
disposal of human bodies.
The currently most popular model for the emergence of modern humans ties their
origin to Africa within the last 200,000 years.
This theory argues that a wave of Homo sapiens then swept out across the world
to replace all other human-like species, including Neanderthals.
Some molecular studies have seemed to refute any possibility that mixing took
place - they indicate that our last common ancestor existed before Neanderthals
themselves arose.
"The problem with this whole debate is that we have so few specimens in Europe -
it's hard to make a hard and fast case," commented Professor Clive Gamble, from
the UK's Centre of the Archaeology of Human Origins.
"The genetic studies are quite convincing but we need more information and that
makes these new fossils very interesting. I'm sure that what we deal with
eventually is going to be a more wonderful mosaic."
In June this year, another group of scientists reported the discovery of the
oldest ever modern human remains at Herto in Ethiopia. The skulls were said to
be about 160,000 years old.
The previous oldest modern human remains in Europe are dated to about 30,000
years ago.
Story from BBC NEWS:
http://news.bbc.co.uk/go/pr/fr/-/2/hi/science/nature/3129654.stm
Published: 2003/09/22 22:19:27 GMT
© BBC MMIII |
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