Welcome to DU! The truly grassroots left-of-center political community where regular people, not algorithms, drive the discussions and set the standards. Join the community: Create a free account Support DU (and get rid of ads!): Become a Star Member Latest Breaking News Editorials & Other Articles General Discussion The DU Lounge All Forums Issue Forums Culture Forums Alliance Forums Region Forums Support Forums Help & Search

erronis

(16,825 posts)
Sun Aug 25, 2024, 01:11 PM Aug 25

Matching dinosaur footprints found on opposite sides of the Atlantic Ocean

https://phys.org/news/2024-08-dinosaur-footprints-sides-atlantic-ocean.html


An international team of researchers led by SMU paleontologist Louis L. Jacobs has found matching sets of Early Cretaceous dinosaur footprints on what are now two different continents.

More than 260 footprints were discovered in Brazil and in Cameroon, showing where land-dwelling dinosaurs were last able to freely cross between South America and Africa millions of years ago before the two continents split apart.

"We determined that in terms of age, these footprints were similar," Jacobs said. "In their geological and plate tectonic contexts, they were also similar. In terms of their shapes, they are almost identical."

The footprints, impressed into mud and silt along ancient rivers and lakes, were found more than 3,700 miles, or 6,000 kilometers, away from each other. Dinosaurs made the tracks 120 million years ago on a single supercontinent known as Gondwana—which broke off from the larger landmass of Pangea, Jacobs said.


Alternative version: The holy spirit was pretty damn busy 6,000 years ago.
17 replies = new reply since forum marked as read
Highlight: NoneDon't highlight anything 5 newestHighlight 5 most recent replies

eppur_se_muova

(37,389 posts)
4. Hmmm ... "matching' is being used *very* loosely here. I don't see any real news to this at all.
Sun Aug 25, 2024, 01:56 PM
Aug 25

Dinosaurs cannot be identified from their tracks, except very broadly. Virtually all large carnivorous dinosaurs would leave similar tracks. Tentative ID of tracks is based on knowing what dinosaurs lived in or near that area at about that time, based on skeletal remains. "Ichnotaxa" are assigned to distinguishably different types of tracks, but may very well represent different species (or genera) at different times and locations, and there is no way of knowing if different ichnotaxa are actually the same species/genus in different stages of growth, or a result of sexual dimorphism. In short, don't read a whole lot into similarities in appearance, even close ones.

We know these two land masses were conjoined at the time -- that's how we know there *might* be a relationship between the creatures that made these tracks. It's hard to see that their similarity offers any new info, only room for supposition.

ShazzieB

(18,641 posts)
6. I'm going to go out on a limb here..,
Sun Aug 25, 2024, 04:32 PM
Aug 25

...and state that I am not ready to reject these findings of an "international team of researchers led by SMU paleontologist Louis L. Jacobs" out of hand.

Besides Jacobs, co-authors of the study include:
- Diana P. Vineyard, research associate at SMU
- Lawrence J. Flynn, Department of Human Evolutionary Biology at Harvard University
- Christopher R. Scotese, Department of Earth and Planetary Sciences at Northwestern University
- Ismar de Souza Carvalho, Universidade Federal do Rio de Janeiro and Centro de Geociências

I think there's a very good chance that these experts know what they're talking about, and I'm sure that they know a metric ton more about their field than I do. I'm also sure that if there are significant holes in their work, their fellow paleontologists won't hesitate to point them out. In the meantime, I shall give them the benefit of a doubt.

eppur_se_muova

(37,389 posts)
10. Fair enough. Scientists do make mistakes, though -- I've caught a few in my own line of work.
Sun Aug 25, 2024, 08:35 PM
Aug 25

Which is not paleontology, admittedly.

At least it's not like I never read a couple of monographs on dinosaur tracks and traces.

sl8

(16,245 posts)
12. It would be helpful if we could see what the scientists actually said in the study, though.
Mon Aug 26, 2024, 06:53 AM
Aug 26

It seems like pop science articles about studies often do a poor job of summarizing said studies.

I'm not saying that's the case here, but I'd sure like to see the actual study. I can't find it oniine anywhere yet.

Jim__

(14,456 posts)
13. This article at CTV News says the study is being (will be?) published.
Mon Aug 26, 2024, 03:16 PM
Aug 26
This article contains a bit more information. An excerpt:


Red stars within this graphic mark the route once taken by dinosaurs when the South American and African continents were connected. (Southern Methodist University via CNN Newsource)
__________________________________________________________________________________________________________________________
...

“Dinosaur tracks are not rare, but unlike the bones usually found, footprints are the proof of dinosaur behavior, how they walked, ran or otherwise, who they walked with, what environment they walked through, what direction they were going, and where they were when they were doing it,” Jacobs said.

It’s difficult to tell the specific species of dinosaurs that traveled along the basins, but they represent a larger portrait of the ancient climate and how different types of animals thrived in the environment that the continental rifting created.

“If your dog and a coyote walk across the same mudflat, you might know that two dog critters walked there, that they are very similar, but you may not be able to know if they are different species. Ditto the dinosaur track situation,” Jacobs said. “All animals have home ranges. All animals expand their ranges. All animals exploit resources as necessary depending on availability, often related to seasonality. Herbivores follow nutritious plants; carnivores follow their herbivorous food.”

...

As research into the basins in Africa and South America has continued in the following decades, Jacobs and Carvalho and their colleagues reviewed existing and new fieldwork and research to analyze the matching aspects. The new study is being published in tribute to Lockley, who devoted his career to studying dinosaur footprints.

...

Martin Eden

(13,458 posts)
5. Alfred Wegener exonerated yet again
Sun Aug 25, 2024, 03:38 PM
Aug 25

Way back in 1912 after seeing striking similarities in the geologic and fossil records in the land masses across the Atlantic ocean from each other, Wegener postulated the theory of Continental Drift.

His theory lacked the driving mechanism of what was later found to be tectonic plates, and his theory was mostly ridiculed by the scientific community of his day.

GiqueCee

(1,321 posts)
7. It's interesting that...
Sun Aug 25, 2024, 04:54 PM
Aug 25

... there seems to be a proportional inversion between the perceived truth of well-reasoned postulates and the prevailing prejudices of those who have built their careers on an opposing viewpoint, when accumulating evidence supports the newer idea. The more vehemently the Old Guard dismisses the newer idea, the more likely it is to prove true.
Back in the sixties, I recall Emmanuel Vilikovsky (sp?) being vilified for his support of the hypothesis of plate tectonics, even as evidence steadily mounted validating it as provable theory.
Funny how that works. Even funnier is how the powers that be continue to repeat their errors in judgement, while expecting different results. In some circles, that's considered the definition of insanity.

Martin Eden

(13,458 posts)
8. It's human nature to protect the edifice one has built
Sun Aug 25, 2024, 05:39 PM
Aug 25

But it's not good science.

By all means, considerable evidence and thorough scrutiny are necessary before abandoning long held consensus -- but the scientific method needs to be first and foremost.

Jim__

(14,456 posts)
11. I'm not sure if this is the Velikovsky you're talking about, if it is he was well-known for pseudo-scientific ideas.
Sun Aug 25, 2024, 08:44 PM
Aug 25

He's famous for his book, World's in Collision. From wikipedia:

Worlds in Collision is a book by Immanuel Velikovsky published in 1950. The book postulates that around the 15th century BC, the planet Venus was ejected from Jupiter as a comet or comet-like object and passed near Earth (an actual collision is not mentioned). The object allegedly changed Earth's orbit and axis, causing innumerable catastrophes that are mentioned in early mythologies and religions from around the world. The book has been heavily criticized as a work of pseudoscience and catastrophism, and many of its claims are completely rejected by the established scientific community as they are not supported by any available evidence.


Velikovsky did also believe in catastrophism, again from wikipedia:


In the 1950s, Immanuel Velikovsky propounded catastrophism in several popular books. He speculated that the planet Venus is a former "comet" which was ejected from Jupiter and subsequently 3,500 years ago made two catastrophic close passes by Earth, 52 years apart, and later interacted with Mars, which then had a series of near collisions with Earth which ended in 687 BCE, before settling into its current orbit. Velikovsky used this to explain the biblical plagues of Egypt, the biblical reference to the "Sun standing still" for a day (Joshua 10:12 & 13, explained by changes in Earth's rotation), and the sinking of Atlantis. Scientists vigorously rejected Velikovsky's conjectures.[13]


According to The New York Times, some of Velikovsky's claims were fairly accurate, but his reasoning is still not accepted:

...

When the Russian-American scholar Immanuel Velikovsky wrote “Worlds in Collision” in 1950, describing catastrophic near collisions and the wandering of planets, astronomers dismissed it as crank science. After all, how could anything push around the planets?

The particulars of Velikovsky’s suppositions, based on readings of mythology, are still crank science, but the history of the solar system is now widely accepted as much more chaotic.

The new model has the giant planets forming much closer together, with Uranus and Neptune bunched closer to where Jupiter and Saturn are today. Then their orbits became unstable and Uranus and Neptune were flung outward.

...

erronis

(16,825 posts)
16. Thanks very much. That looks very in-depth and fascinating.
Mon Aug 26, 2024, 04:33 PM
Aug 26

I have a relative who studied paleo-climatology and should be interested.

Latest Discussions»Culture Forums»Science»Matching dinosaur footpri...