Scientists discover a 5-mile wide undersea crater created as the dinosaurs disappeared
Source: CNN
Updated 8:30 AM ET, Thu August 18, 2022
(CNN) An asteroid from space slammed into the Earth's surface 66 million years ago, leaving a massive crater underneath the sea and wreaking havoc with the planet. No, it's not that asteroid, the one that doomed the dinosaurs to extinction, but a previously unknown crater 248 miles off the coast of West Africa that was created right around the same time. Further study of the Nadir crater, as it's called, could shake up what we know about that cataclysmic moment in natural history.
Uisdean Nicholson, an assistant professor at Heriot-Watt University in Edinburgh, happened on the crater by accident -- he was reviewing seismic survey data for another project on the tectonic split between South America and Africa and found evidence of the crater beneath 400 meters of seabed sediment. "While interpreting the data, I (came) across this very unusual crater-like feature, unlike anything I had ever seen before," he said. "It had all the characteristics of an impact crater."
To be absolutely certain the crater was caused by an asteroid strike, he said that it would be necessary to drill into the the crater and test minerals from the crater floor. But it has all the hallmarks scientists would expect: the right ratio of crater width to depth, the height of the rims, and the height of the central uplift -- a mound in the center created by rock and sediment forced up by the shock pressure. The journal [link:http://www.science.org/doi/10.1126/sciadv.abn3096Science Advances published the study] on Thursday.
"The discovery of a terrestrial impact crater is always significant, because they are very rare in the geologic record. There are fewer than 200 confirmed impact structures on Earth and quite a few likely candidates that haven't yet been unequivocally confirmed," said Mark Boslough, a research professor in Earth and Planetary Sciences at the University of New Mexico. He was not involved in this research but agreed that it was probably caused by an asteroid.
Read more: https://www.cnn.com/2022/08/17/africa/asteroid-crater-west-africa-scn/index.html
This is an interesting find as it suggests there are probably more impact craters - perhaps having happened all around the same time.
From the article -
A diagram, incorporating seismic observations and computer simulations, of how the Nadir Crater formed.
= new reply since forum marked as read
when the earth is only 6000 yrs old 
that indicated a series of strikes from asteroids, or an asteroid, much like the hit on Jupiter many yearsago. I read it so long ago, I can't remember much.
Also, a Kent State U. (OHIO) geoplogy student or geologist theorises that a series of asteroids struck the glacier cover up north and caused intense, sudden melting. Maybe around 12,000 years ago. Again, I can't remember the details, but the idea was controversial, mainly because the glaciers took the impact, so there are no craters.
Until about 1962, scientists didn't think asteroids hit the Earth. Then, they figured out that yes, they could! I think Schumaker or Levy devoted his life to locating meteor craters on Earth. His work was ridicled, too, but he was proven right. There was a world map on line that had locations of known meteorite strikes. Interesting!
Sorry I can't be more definite. It hasn't been 66 million years since I read those findings, but has been awhile 
Fred, Wilma, Pebbles, Barney, Betty, or Bamm-Bamm. I wonder if they managed to survive without any more pterodactyl burgers? Some of the facts of history that scientists just choose to gloss over.
Double Asteroid Redirection Test
https://dart.jhuapl.edu/
https://dart.jhuapl.edu/Mission/index.php
Planitary Defense
https://dart.jhuapl.edu/Mission/Planetary-Defense.php
