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Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution 

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Old 10-18-2013, 05:21 PM
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Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

I wasn't sure where to put this.

October 18, 2013

DMANISI, Georgia -- Found buried under a medieval Georgian village, a 1.8 million year old skull of a human ancestor provides a vivid picture of early evolution and indicates our family tree may have fewer branches than some believe, scientists say.

The fossil is the most complete pre-human skull uncovered. With other partial remains previously found at the rural site, it gives researchers the earliest evidence of human ancestors moving out of Africa and spreading north to the rest of the world, according to a study published Thursday in the journal Science.

The skull and other remains offer a glimpse of a population of pre-humans of various sizes living at the same time - something that scientists had not seen before for such an ancient era. This diversity bolsters one of two competing theories about the way our early ancestors evolved, spreading out more like a tree than a bush.

Nearly all of the previous pre-human discoveries have been fragmented bones, scattered over time and locations - like a smattering of random tweets of our evolutionary history. The findings at Dmanisi are more complete, weaving more of a short story. Before the site was found, the movement from Africa was put at about 1 million years ago.

When examined with the earlier Georgian finds, the skull, "shows that this special immigration out of Africa happened much earlier than we thought and a much more primitive group did it," said study lead author David Lordkipanidze, director of the Georgia National Museum. "This is important to understanding human evolution."

For years, some scientists have said humans evolved from only one or two species, much like a tree branches out from a trunk, while others say the process was more like a bush with several offshoots that went nowhere.

Even bush-favoring scientists say these findings show one single species nearly 2 million years ago at the former Soviet republic site. But they disagree that the same conclusion can be said for bones found elsewhere, such as Africa.

However, Lordkipanidze and colleagues point out that the skulls found in Georgia are different sizes but are considered to be the same species. So, they reason, it's likely the various skulls found in different places and times in Africa may not be different species, but variations in one species.

To see how a species can vary, just look in the mirror, they said.

"Danny DeVito, Michael Jordan and Shaquille O'Neal are the same species," Lordkipanidze said.

The adult male skull found wasn't from our species, Homo sapiens. It was from an ancestral species - in the same genus or class called Homo - that led to modern humans. Scientists say the Dmanisi population is likely an early part of our long-lived primary ancestral species, Homo erectus.

Tim White of the University of California, Berkeley, wasn't part of the study but praised it as "the first good evidence of what these expanding hominids looked like and what they were doing."

Fred Spoor at the Max Planck Institute in Germany, a competitor and proponent of a busy family tree with many species disagreed with the study's overall conclusion, but he lauded the Georgia skull discovery as critical and even beautiful.

"It really shows the process of evolution in action," he said.

Spoor said it seems to have captured a crucial point in the evolutionary process where our ancestors transitioned from Homo habilis to Homo erectus - although the study authors said that depiction is going a bit too far.

The researchers found the first part of the skull, a large jaw, below a medieval fortress in 2000. Five years later - on Lordkipanidze's 42nd birthday - they unearthed the well-preserved skull, gingerly extracted it, putting it into a cloth-lined case and popped champagne. It matched the jaw perfectly. They were probably separated when our ancestor lost a fight with a hungry carnivore, which pulled apart his skull and jaw bones, Lordkipanidze said.

The skull was from an adult male just shy of 5 feet, (1.5 meters), with a massive jaw and big teeth, but a small brain, implying limited thinking capability, said study co-author Marcia Ponce de Leon of the University of Zurich. It also seems to be the point where legs are getting longer, for walking upright, and smaller hips, she said.

"This is a strange combination of features that we didn't know before in early Homo," Ponce de Leon said.

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Old 10-18-2013, 05:44 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

Rediculous, everyone knows the earth is only ~6000yrs old.

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Old 10-18-2013, 07:54 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

Maybe someone had a pet chimp...If we evolved from monkeys why are there still monkeys,,,sigh

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Old 10-18-2013, 11:54 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

I wonder what other artifacts remain unearthed. What else is out there. Scientist & archeologist think they know everything about our origin.

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Old 10-19-2013, 12:04 AM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

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Maybe someone had a pet chimp...If we evolved from monkeys why are there still monkeys,,,sigh
Take Biological Anthropology and you will find out. Why we still have monkeys

Adaptation/Mutation due to climate/environment oh and favorable traits.

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Old 10-19-2013, 12:18 AM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

Looks more like an ancient monkey to me.

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Old 10-19-2013, 04:01 AM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

oohh oohh I cast feces at you

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Old 10-20-2013, 04:48 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

cool discovery

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Old 10-20-2013, 05:20 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

I saw another article showing the top of a head and I can't find it now. I'm not sure if they are related. I also didn't see where it was.

Did anyone else catch it? It showed the top of a skull buried.

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Old 10-20-2013, 11:22 PM
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Re: Discovery of 1.8M Year Old Human Skull: Glimpse Into Evolution

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Originally Posted by petedeamon View Post
Maybe someone had a pet chimp...If we evolved from monkeys why are there still monkeys,,,sigh
I'm not defending Evolution, but I understand it. We evolved from (supposedly) a similar predecessor. Similar as to how there are many different species and variations in primates, we are a variation and species still in the primate family. Kingdom Animalia. Taking a historical Geology class so I am sure this will be brought up Tuesday during class, if not, I'll be mentioning it!

Thanks OP.

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