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Prehistoric Footprints Show How Our Ancestors Walked
http://news.discovery.com ^ | Tue Jul 19, 2011 07:00 PM ET | By Jennifer Viegas

Posted on 07/20/2011 7:52:17 AM PDT by Red Badger

The ancestor who made the 3.7 million-year-old prints walked in a "less ape-ish way" than some humans do today.

The oldest known human ancestor footprints, dated to 3.7 million years ago, reveal that some of the earliest members of our family tree walked fully upright with feet similar to ours, according to new research.

The findings, published in the Journal of the Royal Society Interface, push back the date for upright walking in our ancestry by nearly 2 million years. That's because previous studies had concluded this trademark gait emerged in the genus Homo about 1.9 million years ago.

The 3.7 million-year-old footprint maker, likely a species called Australopithecus afarensis (of the "Lucy" fossil fame), walked in an even less ape-ish way than some humans do today.

Lead author Robin Crompton told Discovery News that "some healthy humans produce more 'ape like' footprints."

Crompton, a professor in the University of Liverpool's School of Biomedical Sciences, explained that many researchers believed loss of the "so-called mid-tarsal break," a flexing of the side midfoot, "distinguished humans from non-human apes." This flexing can contact the ground and leave behind a mark in footprints. But Crompton and his colleagues found that certain people today create such footprints, while some of the ancient prints were lacking the distinguishing feature.

The researchers made this determination after studying the ancient footprints, found at a site called Laetoli in Tanzania. At least one, or possibly two, individuals left behind the footprints as they walked through damp volcanic ash.

Detailed imaging, based on methods employed in functional brain imaging, yielded clear, three-dimensional views of the 11 intact prints in the Laetoli trail. The scientists then compared these ancient footprints with prints made by modern humans and other living great apes.

It's now known that the prehistoric walker moved at just over 3 1/2 feet per second.

"Walking was completely erect," Crompton said. "Push off was substantially by the big toe and a medial arch was present. There was no collapse of the lateral side of the foot, as has been recently suggested."

The probable walker, A. afarensis, is best known via a partial skeleton named "Lucy." Lucy and other members of her species are thought to have lived at least some of their time in trees. Since Lucy was already walking upright in a very human-way, the new study strengthens the theory that erect, two-footed walking evolved in a tree-living ancestor of living great apes and humans.

Crompton explained that this way of moving was "probably faster than quadrupedalism on the ground in an animal built like great apes are." It also may have "enhanced feeding from low branches or bushes."

Upright walking on two feet additionally could have helped with visual displays and showing aggression, he said. All of this may have happened as forest canopies broke up, forcing A. afarensis to leave its tree homes for a more terrestrial way of life.

Unlike modern humans, however, this species had short legs and a long body. When compared to other animals, we have just the opposite: relatively long legs and a short body.

Sarah Elton of the Hull York Medical School told Discovery News, "Although there have been heated disagreements over how to interpret the Laetoli footprints, this incredibly detailed and well thought-out study must surely help to put some of the debate to rest."

She continued, "I was surprised by such clear evidence for a very 'human-like' foot morphology and walking style, particularly the presence of a longitudinal arch, and 'toe off' when walking."

Elton added, "This strongly suggests that the makers of the footprints, although living over 3 million years ago, shared many features of their locomotion with us."

Crompton and his team next hope to determine when our ancestors first walked, or ran, over very long distances, enabling them to colonize the world.


TOPICS: Culture/Society
KEYWORDS: andtheyvotetoo; discrimination; godsgravesglyphs; lessapeshatish; lessapeshtish; lucyonthesofa; obvious; thansomehumanstoday; withpopcorn
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1 posted on 07/20/2011 7:52:19 AM PDT by Red Badger
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To: SunkenCiv

Ping!............


2 posted on 07/20/2011 7:52:43 AM PDT by Red Badger (PEAS in our time? Obama cries PEAS! PEAS! when there is no PEAS!..........................)
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To: Red Badger

They've identified the footprints as belonging to Lucy. I'm not sure how. Probably one of those "we date the rocks by the fossils and we date the fossils by the rocks" things.

3 posted on 07/20/2011 7:57:27 AM PDT by ClearCase_guy (The USSR spent itself into bankruptcy and collapsed -- and aren't we on the same path now?)
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To: Red Badger

If those were footprints I happened to see in the sand, the lack of toe separation would tell me the person usually wore shoes.


4 posted on 07/20/2011 7:58:42 AM PDT by fso301
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To: Red Badger

5 posted on 07/20/2011 7:58:48 AM PDT by Vaquero ("an armed society is a polite society" Robert A. Heinlein)
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To: Vaquero

Hey, that’s my old neighbor from Huguenot NY!


6 posted on 07/20/2011 8:04:50 AM PDT by Darksheare (You will never defeat Bok Choy!)
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To: Red Badger

``At least one, or possibly two, individuals left behind the footprints as they walked through damp volcanic ash.``

Give me a break-

Appears to be 2 separate individuals walking side by side;
otherwise it`s one individual with four feet playing hopscotch.


7 posted on 07/20/2011 8:05:01 AM PDT by bunkerhill7
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To: ClearCase_guy

Likely belonging to the same species, to you, means that Lucy herself made the prints?

Amusingly obtuse.


8 posted on 07/20/2011 8:08:37 AM PDT by allmendream (Tea Party did not send the GOP to D.C. to negotiate the terms of our surrender to socialism.)
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To: allmendream
Likely belonging to the same species, to you, means that Lucy herself made the prints? Amusingly obtuse.

And how did they know her damn name?
9 posted on 07/20/2011 8:12:10 AM PDT by ZX12R
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To: Red Badger

Human ancestors walked like...

wait for it...

humans!


10 posted on 07/20/2011 8:12:26 AM PDT by JWinNC (www.anailinhisplace.net)
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To: ZX12R

Because the Beatles wrote a song about her! ;)


11 posted on 07/20/2011 8:14:29 AM PDT by allmendream (Tea Party did not send the GOP to D.C. to negotiate the terms of our surrender to socialism.)
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To: Red Badger

12 posted on 07/20/2011 8:18:01 AM PDT by max americana (FUBO NATION 2012 FK BARAK)
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To: JWinNC

Humans walked like humans,
apes walked like apes,

and there’s no in-between, “transitional” hip displacement.


13 posted on 07/20/2011 8:19:21 AM PDT by MrB (The difference between a Humanist and a Satanist - the latter knows whom he's working for)
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To: max americana

LOL!


14 posted on 07/20/2011 8:19:57 AM PDT by ZX12R
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To: Red Badger

http://www.youtube.com/watch?v=wippooDL6WE


15 posted on 07/20/2011 8:23:24 AM PDT by magslinger (Zombies make up much of the Democrat's base.)
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To: allmendream
Amusingly obtuse.

He's raised it to an art form.

16 posted on 07/20/2011 8:42:23 AM PDT by null and void (Day 911. When your only tools are a Hammer & Sickle, everything looks like a Capitalist...)
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To: allmendream
I didn't mean to imply that Lucy "herself" made the prints. That would be silly.

I merely note that for that species, we have no fossils of the feet. Yet we have identified footprints made by the species. It's guesswork, not science.

17 posted on 07/20/2011 8:42:28 AM PDT by ClearCase_guy (The USSR spent itself into bankruptcy and collapsed -- and aren't we on the same path now?)
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To: Red Badger

Morton’s Toe ping


18 posted on 07/20/2011 8:43:29 AM PDT by wolfman23601
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To: Red Badger

More proof that we are NOT related to Monkeys. We are created in the image of god Period.


19 posted on 07/20/2011 8:45:52 AM PDT by BobinIL
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To: All

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20 posted on 07/20/2011 8:49:38 AM PDT by DeoVindiceSicSemperTyrannis (Want to make $$$? It's easy! Use FR as a platform to pimp your blog for hits!!!)
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