HomeLatest ThreadsGreatest ThreadsForums & GroupsMy SubscriptionsMy Posts
DU Home » Latest Threads » Forums & Groups » Topics » Science » Science (Group) » 52-foot-tall 'megaripples...

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 YucatŠn 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

8 replies, 2996 views

Reply to this thread

Back to top Alert abuse

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 8 replies Author Time Post
Reply 52-foot-tall 'megaripples' from dinosaur-killing asteroid are hiding under Louisiana (Original post)
Judi Lynn Tuesday OP
Cracklin Charlie Tuesday #1
niyad Tuesday #2
The Unmitigated Gall Wednesday #3
Javaman Wednesday #4
ret5hd Wednesday #5
Javaman Thursday #7
LudwigPastorius Wednesday #6
locks Thursday #8

Response to Judi Lynn (Original post)

Tue Jul 20, 2021, 10:21 PM

1. I have a hypothesis about this geological event.

Havenít read this yet. Canít wait to see how this matches up.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Judi Lynn (Original post)

Tue Jul 20, 2021, 10:46 PM

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

Reply to this post

Back to top Alert abuse Link here Permalink


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.

Reply to this post

Back to top Alert abuse Link here Permalink


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

Reply to this post

Back to top Alert abuse Link here Permalink


Response to Javaman (Reply #4)

Wed Jul 21, 2021, 05:50 PM

5. I thought it was MagaNipple.

Reply to this post

Back to top Alert abuse Link here Permalink


Response to ret5hd (Reply #5)

Thu Jul 22, 2021, 08:33 AM

7. I stand corrected! LOL nt

Reply to this post

Back to top Alert abuse Link here Permalink


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.

Reply to this post

Back to top Alert abuse Link here Permalink


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!

Reply to this post

Back to top Alert abuse Link here Permalink

Reply to this thread