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Tue Jul 20, 2021, 10:14 PM

52-foot-tall 'megaripples' from dinosaur-killing asteroid are hiding under Louisiana

By Laura Geggel - Editor about 4 hours ago

These are the largest known megaripples on Earth.



(Image credit: iStock / Getty Images Plus)

Ancient "megaripples" as tall as five-story buildings are hiding deep under Louisiana, and their unique geology indicates that they formed in the immediate aftermath of the asteroid strike that killed the nonavian dinosaurs, a new study finds.

The 52-foot-tall (16 meters) megaripples are about 5,000 feet (1,500 m) under the Iatt Lake area, in north central Louisiana, and date to the end of the Cretaceous period 66 million years ago, when that part of the state was underwater, the researchers said. The megaripples' size and orientation suggest that they formed after the giant space rock, known as the Chicxulub asteroid, slammed into the Yucatán Peninsula, leading to the Chicxulub impact tsunami, whose waves then rushed into shallower waters and created the megaripple marks on the seafloor, the researchers said.

The occurrence of "ripples of that size means something very big had to disturb the water column," study lead researcher Gary Kinsland, a professor in the School of Geosciences at the University of Louisiana at Lafayette, told Live Science. "This is just further evidence that the Chicxulub impact ended the Cretaceous period."

The project began when the energy corporation Devon Energy took a 3D seismic survey of Iatt Lake. A seismic survey entails creating loud sound waves (often made with "explosives or big thumps," Kinsland said) and placing surface detectors around the area that can capture the returning sound waves, which are reflected when they hit various underground rock layers. Data from these sound waves allow researchers to make maps of the underground geology.

More:
https://www.livescience.com/megaripples-tsunami-dinosaur-asteroid.html?utm_source=notification

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Reply 52-foot-tall 'megaripples' from dinosaur-killing asteroid are hiding under Louisiana (Original post)
Judi Lynn Jul 20 OP
Cracklin Charlie Jul 20 #1
niyad Jul 20 #2
The Unmitigated Gall Jul 21 #3
Javaman Jul 21 #4
ret5hd Jul 21 #5
Javaman Jul 22 #7
COL Mustard Sunday #10
LudwigPastorius Jul 21 #6
COL Mustard Sunday #11
LudwigPastorius Sunday #13
COL Mustard Sunday #14
Unknown Beatle Wednesday #18
LudwigPastorius Wednesday #19
locks Jul 22 #8
FakeNoose Jul 24 #9
LudwigPastorius Sunday #12
Old Okie Monday #15
RainCaster Tuesday #16
StClone Tuesday #17
Pinback Thursday #20

Response to Judi Lynn (Original post)

Tue Jul 20, 2021, 10:21 PM

1. I have a hypothesis about this geological event.

Haven’t read this yet. Can’t wait to see how this matches up.

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Response to Judi Lynn (Original post)

Tue Jul 20, 2021, 10:46 PM

2. Thank you so very much. This is utterly fascinating.

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Response to Judi Lynn (Original post)

Wed Jul 21, 2021, 11:16 AM

3. Sweet Lord Almighty...

What that day must have looked like. Kind a hard not to wax biblical. I read somewhere once that they did an experiment and found that temperatures in burrows five or more feet deep remained tolerable for our little mammal forebears while absolute hellfire swept the ground above and made charcoal of the creatures that hunted and ate them.

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Response to Judi Lynn (Original post)

Wed Jul 21, 2021, 11:49 AM

4. MegaRipple was my finishing move when I was a pro wrestler. nt

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Response to Javaman (Reply #4)

Wed Jul 21, 2021, 05:50 PM

5. I thought it was MagaNipple.

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Response to ret5hd (Reply #5)

Thu Jul 22, 2021, 08:33 AM

7. I stand corrected! LOL nt

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Response to Javaman (Reply #4)


Response to Judi Lynn (Original post)

Wed Jul 21, 2021, 06:36 PM

6. I thought a MegaRipple was the jumbo-sized version of Fred Sanford's favorite drink.

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Response to LudwigPastorius (Reply #6)

Sun Jul 25, 2021, 05:00 PM

11. I Bow To Your Clearly Superior Sense Of Humor

I said the same thing before I saw your post.

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Response to COL Mustard (Reply #11)

Sun Jul 25, 2021, 06:38 PM

13. Great minds...etc.

👍

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Response to LudwigPastorius (Reply #13)

Sun Jul 25, 2021, 07:23 PM

14. Either I'm In Great Company

Or you’re in deep kimchi!

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Response to LudwigPastorius (Reply #6)

Wed Jul 28, 2021, 06:59 PM

18. Ah yes.

Ripple, Boone's Farm, Mateus, and Lancers - wines of the hippie generation.

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Response to Unknown Beatle (Reply #18)

Wed Jul 28, 2021, 09:06 PM

19. Another hippy-dippy potable:



Then, if you were drinking on the wrong side of town, this was for you:

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Response to Judi Lynn (Original post)

Thu Jul 22, 2021, 11:51 PM

8. My dinosaur-loving grandkids

who live in Louisiana will love this!

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Response to Judi Lynn (Original post)

Sat Jul 24, 2021, 05:51 PM

9. Dinosaurs have been on this earth more recently than 66 million years ago

If those dinos were killed off that long ago, then more came later. Because we have bone remnants from as recently as 1 million years ago. It seems evolution has been around the block a few times.

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Response to FakeNoose (Reply #9)

Sun Jul 25, 2021, 06:37 PM

12. I used to see a lot of dinos back in the 70s.

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Response to FakeNoose (Reply #9)

Mon Jul 26, 2021, 11:18 AM

15. Dinosaurs

After a google search for last dinosaur alive, found a Yale News article giving the age of the last dinosaur as 65 million years ago. Any source for the dinosaurs as recent as 1 million years ago?

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Response to Old Okie (Reply #15)

Tue Jul 27, 2021, 11:42 AM

16. Dinosaurs still exist in the GOP

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Response to FakeNoose (Reply #9)

Tue Jul 27, 2021, 01:35 PM

17. Ten thousand years ago

My Great Grandfather's oral history included the day the last bronto died.

Seriously: https://www.livescience.com/3945-history-dinosaurs.html

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Response to Judi Lynn (Original post)

Thu Jul 29, 2021, 10:47 PM

20. Oh, great. Now all the "Jazz is for dinosaurs" people

have proof!

Very interesting info — thanks!

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