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Dinosaurs Could Doggy Paddle Long Distances
Popular Science ^ | April 8, 2013 | Rose Pastore

Posted on 04/12/2013 4:05:42 AM PDT by SunkenCiv

New evidence suggests some two-legged dinos were strong swimmers.

Most people still have a very last-century idea of what dinosaurs were like. No, T. rex didn't stand upright; lots of dinos were actually feathered, not leathery; and they may have been killed by a comet, not an asteroid. Now there's some new research to further muddle your mental image: Some of those clumsy-looking land dinosaurs, like the early tyrannosaur, may have actually been strong swimmers. Scott Persons, a researcher at the University of Alberta, examined fossilized claw marks on a river bottom in China's Szechuan Province. Persons found that the scratches, which cover a distance of nearly 50 feet, suggest coordinated left-right, left-right paddling.

"What we have are scratches left by the tips of a two-legged dinosaur's feet," Persons says. "The dinosaur's claw marks show it was swimming along in this river and just its tippy toes were touching bottom."

The claw marks were probably left by a carnivorous theropod dinosaur that stood just over 3 feet at the hip -- possibly an early tyrannosaur or a Sinocalliopteryx, Persons says.

The study appeared April 8 in the journal Chinese Science Bulletin.

(Excerpt) Read more at popsci.com ...


TOPICS: History; Science; Travel
KEYWORDS: dinosaur; dinosaurs; godsgravesglyphs; paleontology
A swimming theropod Nathan E. Rogers

A swimming theropod Nathan E. Rogers

1 posted on 04/12/2013 4:05:42 AM PDT by SunkenCiv
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To: StayAt HomeMother; Ernest_at_the_Beach; decimon; 1010RD; 21twelve; 24Karet; 2ndDivisionVet; ...

 GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach
On Monday I had Friday on my mind.

To all -- please ping me to other topics which are appropriate for the GGG list.


2 posted on 04/12/2013 4:06:24 AM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

glad I know that


3 posted on 04/12/2013 4:16:49 AM PDT by hadaclueonce (Forget Mexico. Put the border fence around California.)
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To: SunkenCiv
tippy toes were touching bottom.

Makes sense ... Thanks SunkenCiv. Also explains some fossilization recovered.

4 posted on 04/12/2013 4:28:14 AM PDT by no-to-illegals (Scrutinize our government and Secure the Blessing of Freedom and Justice)
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To: hadaclueonce

They are still here, we just call them chickens now..../s


5 posted on 04/12/2013 4:59:11 AM PDT by 9422WMR
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To: SunkenCiv

Hard to out “doggy-paddle” a tsunami.


6 posted on 04/12/2013 5:03:26 AM PDT by carriage_hill (The most insidious power the news media has, is the power to ignore.)
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To: SunkenCiv
I will display my abject stupidity --

I'm a theropod, I'm in water up to my neck (per the picture) and I'm swimming along, my feet occasionally making contact with the bottom of the river, leaving some footprints for posterity.

Can someone please explain to me the mechanism whereby the footprints stay in the mud, the river eventually ceases to flow, the water that was the river evaporates (how long does that take?)-- throughout all of this, the mud still hangs on to the precious imprint of my footprints -- then, the mud bakes in the sunlight and eventually becomes rock, and millions of years later people look at the rock and say "Aha! This was once mud, about 8 ft underwater, and a theropod stepped on it and left a footprint!"

I've been in rivers, streams, lakes, and ponds. I have stepped in mud. I have left footprints. They last less than a minute. Not a single one of my footprints in an underwater environment has yet become a fossil. What am I doing wrong?

7 posted on 04/12/2013 5:29:02 AM PDT by ClearCase_guy (The ballot box is a sham. Nothing will change until after the war.)
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To: ClearCase_guy
What am I doing wrong?

You don't weigh a gazillion pounds? ;-)

8 posted on 04/12/2013 6:05:57 AM PDT by stayathomemom (Beware of kittens modifying your posts.)
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To: SunkenCiv

Neat !


9 posted on 04/12/2013 6:45:46 AM PDT by Dustbunny ("Government does not solve problems; it subsidizes them. " Ronald Reagan)
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To: ClearCase_guy

The key to most fossilization is burial prior to disturbing or eradicating what is to be fossilized, be it body parts, impressions, trackways, etc. In most cases, these sorts of impressions/fossils occur in the mud flats along the sides of river, or in shallow, very slow flow waterways (hence the mud, not sand) or lakes. These were most likely in fine-grained mud, indicting slow to no flow in the water, and were not disturbed (i.e. washed away) prior to burial by an influx of new sediment (i.e. there was a flood, carrying with new sediment to cover the old sediments and anything in or on the surface).

So, most likely these were in some sort of shallow oxbow lake adjacent to a river, or were in a lake bed that was fed by a stream/river. The drag marks on the bed of the lake or river were covered over with sediment prior to being washed away or eradicated by other mechanisms.

Trace fossils are actually quite common in some sediments, particularly in ocean sediments.


10 posted on 04/12/2013 7:12:13 AM PDT by LaRueLaDue
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To: SunkenCiv
Would the head really be up like a periscope or cleaving the water like darned near every other swimming animal?

Beaver:

Dog:

Elephant:

Lizard:

Horse:

Alligator:

11 posted on 04/12/2013 7:47:40 AM PDT by null and void (Republicans create the tools of oppression and Democrats use them. Gun confiscation enables tyranny.)
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To: null and void

First thing I thought when I saw the photo.. head down, nostrils just clearing the waterline.


12 posted on 04/12/2013 8:32:15 AM PDT by douginthearmy
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To: douginthearmy
That illustration following "Most people still have a very last-century idea of what dinosaurs were like. No, T. rex didn't stand upright" darn near burned out my I-Ron-O-Meter.
13 posted on 04/12/2013 8:36:47 AM PDT by null and void (Republicans create the tools of oppression and Democrats use them. Gun confiscation enables tyranny.)
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To: SunkenCiv
A swimming theropod Nathan E. Rogers.

How did they ever learn the theropod's name?

14 posted on 04/12/2013 9:05:59 AM PDT by Verginius Rufus
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To: Verginius Rufus

It was engraved on his Thuitcase.


15 posted on 04/12/2013 3:50:46 PM PDT by SunkenCiv (Romney would have been worse, if you're a dumb ass.)
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To: SunkenCiv

The Texas area was one big shallow sea or swamp back in those days


16 posted on 04/12/2013 3:54:16 PM PDT by GeronL (http://asspos.blogspot.com)
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To: SunkenCiv

There is film of Komodo dragons swimming in the sea between islands.

Also film with elephants, bears and snakes swimming. If it has lungs to fill with air, it can swim.

Can anyone think of a mammal or reptile that CAN’T swim—at least for short distances.


17 posted on 04/14/2013 6:20:50 AM PDT by wildbill (You're just jealous because the Voices talk only to me.)
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To: ClearCase_guy; SunkenCiv
The real story on how the fossils got down there:


18 posted on 04/15/2013 4:10:01 PM PDT by colorado tanker
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