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[caltrek]

Russian Saber-Tooth Fossils Illuminate Early Evolution of Mammal Lineage

 

https://www.courthou...mammal-lineage/

 

Introduction:

 

(Courthouse News) – Researchers have discovered the fossils of two new species of ancient saber-toothed predators that will help illuminate a key period in the early evolution of mammals.

 

The lineage of modern mammals can be traced back to a group of animals called therapsids, a diverse group of “protomammals” that dominated terrestrial ecosystems during the Permian period approximately 299 to 252 million years ago — millions of years before dinosaurs first roamed the planet.

 

A pair of studies published Friday in the journal PeerJ describe two previously unknown species of predatory protomammals.

 

Discovered near the town of Kotelnich along the Vyatka River in Russia, the fossils add to the Vyatka Paleontological Museum’s collection of well-preserved Permian fossils.

 

As the majority of Permian fossils have been discovered in South Africa’s Karoo Basin, the newly described remains help balance out the outsized role the African nation’s record serves in informing researchers’ understanding of protomammal evolution.

The therocephalian Gorynychus masyutinae, top predator of the Kotelnich fossil assemblage, hunting a tree-dwelling herbivore (Suminia getmanovi).

(Matt Celeskey)

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In South Africa, Digging for Clues to an Ancient Extinction — and the Planet’s Future

 

https://undark.org/a...e-south-africa/

 

Introduction:

 

(Undark) IN JANUARY, I stood in a ditch in the middle of nowhere in South Africa, and the summer sun beat down as I stared at a heap of grape soda-colored rocks. Bob Gastaldo, the paleontologist whose research team I had been following through the Karoo, had his back turned and was busy striking these quarter-billion year-old rocks — residues of a mass extinction that caused about 70 percent of all land life and 96 percent of all marine life to vanish permanently — with his hammer.

 

The extinction has a few names. One of them is the Permian-Triassic (PT) mass extinction, for the two geologic periods it separates; another is the “Great Dying,” for all the life-ending change it caused. It is the biggest extinction of the so-called “Big Five” mass extinctions that punctuate the history of life on our planet, and, according to many researchers, one of the best places to see the PT land extinction as it exists in Earth’s many-layered rock record is in the Karoo, a vast, semidesert region of south-central South Africa.

 

Where I stood in that ditch, the extinction horizon — that is, the point where the rock layers go from Permian to Triassic in age — is supposed to be somewhere amid the rocks that were in front of me. If some of these rocks were gravestones, you would see names like Diictodon and Daptocephalus — names of land animals that missed the train to the Triassic. Near the ditch, Gastaldo had tripped over the fossil skull of what was probably a Lystrosaurus.

 

Other paleontologists, including Roger Smith of the Iziko South African Museum in Cape Town, believe the extinction of land animals suggested by these rocks coincided with a massive die-off of marine life. “It happened on land and it happened in the sea and it happened at the same time,” Smith told me. Then, as life reset itself, new species appear above the boundary.

 

Sandra Kamo, a geochronologist from the University of Toronto, hopes to determine the absolute ages of these rocks, which would make it clear when the land extinction happened.

Visuals: Lucas Joel

[caltrek]

Fossils - General News and Discussion  was really a good idea for a thread.  I am having fun sharing articles on this general topic.

 

 

Early Plants Grew Big to Colonize Earth, Study Finds

 

https://www.courthou...th-study-finds/

 

Introduction:

 

(Courthouse News) – Organisms on Earth about 600 million years ago did not suddenly grow large because they were fighting for more food, but because they were trying to propel their offspring farther into the world.

 

Research suggests real estate was a prime driver in the first expansion of complex organisms on Earth, according to a study by the University of Cambridge released Monday.

 

Between 635 and 541 million years ago, life on earth was microscopic. But during the Ediacaran Period the first complex organisms began to appear on the ocean floor.

 

Long before any life could crawl, walk, fly or swim there were stationary rangeomorphs, which resembled a plant frond with stem-like structures that are believed to have gathered nutrients from the water around them.

 

One hypothesis is competition in the frond community led to innovations with rangeomorphs’ stems and they outgrew the rest of the microscopic life around them. Rangeomorph fossils show that some of the largest organisms grew to at least 6 feet tall.

Artist’s impression of rangeomorphs, fern-like organisms that lived during the Ediacaran Period.

(Charlotte Kenchington)

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Ancient deer skeleton may reveal how Neanderthals hunted prey

 

https://www.sciencem...als-hunted-prey

 

Introduction:

 

(Science) The fallow deer was about 6 years old when it died about 120,000 years ago on a lake shore in Germany. Its skeleton, recovered by archaeologists and belonging to the extinct species Dama dama geiselana (a different member of which is pictured above), shows an 11-millimeter, circular wound at the top of its pelvis, right next to its spine. But the hole (pictured below) doesn’t look like it came from a fight with another male or the tooth of a carnivore. No, this particular injury could only have been made by a human tool during a hunt, scientists say. And the only human species in Germany so long ago was the Neanderthal.

 

Archaeologists have discovered ancient Neanderthal spears in both the United Kingdom and Germany, but they weren’t sure how these hunters actually used them. Did they throw them at their prey from long distances? Or did they chase down the animals and stab them at close range? Now, scientists have recreated the 1.8-meter-long spears used by Neanderthals in Germany 300,000 years ago and attacked modern deer bones with them. They found they couldn’t make the kind of injury found on the 120,000-year-old skeleton by throwing the spears. Rather, they had to thrust the weapon upward at the animal’s hip while standing close to it, the researchers report today in Nature Ecology & Evolution. This suggests Neanderthals hunted at close range.

 

When present-day foragers hunt wild game like this, they usually work together to organize an ambush. So, Neanderthals may have cooperated to take down their prey, too, adding to the list of complex social behaviors our extinct cousins were capable of.

 

LANDESAMT FÜR DENKMALPFLEGE UND ARCHÄOLOGIE SACHSEN-ANHALT, JURAJ LIPTÁ

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The Antwerp Area in Belgium

 

http://www.fossilnews.com/

 

Introduction:

 

(Fossil News) The Pliocene outcrops are quite abundant in Belgium. Local Pliocene is usually referred to as the “Scaldisian”, by reference to the Latin name “Scaldis” of the river Schelde (in Dutch, “Escaut” in French) near which Pliocene outcrops are encountered. Located in the north of the country, these sandy layers may be observed at the top of clay quarries in small cities like Steendorp, Sint-Niklaas and Tielrode. But the type location of the “Scaldisian” is to be seen in building sites and on sandy plains in the Antwerp harbour area.

 

Like most big cities in Belgium, Antwerp possesses a Dutch name, “Antwerpen”, and a French name, “Anvers”. It can be rather confusing for people coming from outside the country who try to reach the city.  Antwerp is a nice town and is also world-renowned for its diamond trading, but that is another story. If you are interesting in buying diamonds, Beyond4cs.com would be a great website to start learning about diamonds.

 

During the Miocene period, the Antwerp area was a gigantic gulf where sea currents pushed around the carcasses of dead sea mammals like whales, seals, and dolphins. When these decomposed, isolated bones fell to the bottom of the sea. Such an amazing amount of flesh attracted hungry scavengers like sharks, which lose some of their teeth while feeding. At the beginning of the Pliocene Epoch, erosion eliminated an important part of the Miocene sands. The “hard parts”, i.e. small stones, fossil bones, and teeth, were concentrated in great numbers at the bottom of the Pliocene rocks. Together with green sand, this made up what is called here a “base gravel”. Later the glauconitic sand partially condensed into sandstone pebbles; the best proof is the black stones containing a reworked shark tooth or vertebra. Finally more and more sand layers were deposited, some of them containing rich mollusc assemblages or many cetacean bones.

 

In the harbour area, different Pliocene outcrops may be observed, but now these will almost never occur in situ. The best time for finding Antwerp fossils was during some docks digging work fifteen years ago, when Pliocene sands that were extracted from docks were accessible to amateur collectors. But do not despair; nowadays it is still possible to find first-class fossils in displaced remnants which can be found in the vicinity of these docks.

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Stunning fossils: Dinosaur death match

 

https://www.newscien...ur-death-match/

 

Introduction:

 

(New Scientist) They will remain forever locked in mortal combat. The Velociraptor has sunk its deadly foot claw deep into the neck of the herbivore, a boar-sized creature called Protoceratops. This vicious attack may have hit the carotid artery – a lethal blow.

 

But the Protoceratops fought back. It has thrown the Velociraptor to the ground before it, and its jaws are locked on to the predator’s right arm. The bite appears to have broken the Velociraptor‘s arm. “There is no doubt these animals were fighting,” says Mark Norell of the American Museum of Natural History in New York, who studied the fossil while it was on loan to the museum. “There is nothing else like the fighting dinosaurs, which captures direct evidence of a single instant in time.”

 

What happened next? One possibility is that a sand dune collapsed on them while they were still fighting for their lives. Norell thinks heavy rains had destabilised the dune, so it flowed quickly and smoothly over the pair as they fought. Elsewhere in Mongolia, he says, animals have been found trapped in their burrows by similar flows.

Or perhaps the plant-eater bled to death from the blow to its carotid artery, trapping the injured Velociraptor under its heavy body. When the predator eventually died, too, a sandstorm covered both bodies, suggests Ken Carpenter...

Forever locked in combat 

(Image: David Clark/Dinosaurs Alive/IMAX Film/Giant Screen Films)

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Armored Dinosaur Found in Utah Evolved From Asian Ancestors

 

https://www.courthou...sian-ancestors/

 

Introduction:

 

(Courthouse News) – Scientists at the Natural History Museum of Utah on Thursday revealed the discovery of fossils belonging to a bony-tailed dinosaur with armor-like skin that walked the earth 76 million year ago.

 

Paleontologists at the museum said they’ve unearthed fossils belonging to Akainacephalus johnsoni. The medium-sized, herbivorous dinosaur evolved from a line of dinosaurs called anklosaurids which lived in Asia and western North America during the Late Cretaceous Period.

 

Walking on four legs and using leaf-shaped teeth to eat plants, the dinosaur also had a large mass at the end of its tail which was used for crushing things and for self-defense.

 

Akainacephalus lived during the upper Campanian stage of the Late Cretaceous Period, which spanned from approximately 84 million to 72 million years ago. Akaina comes from the Greek word for spike or thorn while cephalus comes from the word for head.

 

The museum said it took almost four years to fully prepare all of the fossils for display. Museum volunteer Randy Johnson helped put the fragments of the skull together, and now is the dinosaur’s namesake.

Scientists believe the dinosaur Akainacephalus johnsoni. recently discovered in Utah, evolved from ancestors in Asia.

(Andrey Atuchin/Natural History Museum of Utah)

[wjfox]

A beautifully preserved fish tail from Jurassic limestone in Germany (approx. 150 million years old).

 

Even the patterning has been preserved.

 

 

[caltrek]

Newly Discovered Jurassic Piranha Likely Nibbled Fish Fins

 

https://www.courthou...bled-fish-fins/

 

Introduction:

 

(Courthouse News) – Bony ray-finned fish with sharp teeth nibbled on other fish in the sea about 150 million years ago, according to researchers who say the newly discovered piranha-like creature presents the earliest evidence of fish feeding on other fish.

 

Sporting triangular teeth with serrated cutting edges on the inside of their lower jaws, these Jurassic-era fish were found in limestone deposits next to some of their victims – other fish with nibbled fins, according to researchers who published their findings in scientific journal Current Biology.

 

The piranha-like fish were discovered in modern-day southern Germany and unlike the modern piranha, these distant cousins swam in the ocean and grabbed their food on the go as they stealthily ate the fins of other fish.

 

“This is an amazing parallel with modern piranhas, which feed predominantly not on flesh but the fins of other fishes. It’s a remarkably smart move as fins regrow, a neat renewable resource,” said study author David Bellwood from James Cook University in Australia. “Feed on a fish and it is dead; nibble its fins and you have food for the future.”

 

The now extinct flesh-eating fish – named Piranhamesodon pinnatomus – swam in the ocean while small dinosaurs roamed the earth. Their fossils are now part of the natural history exhibit at Jura Museum in Eichstätt, Germany.

The fossil of a newly discovered piranha-like fish from the Jurassic period. It likely used its sharp pointed teeth to feed on the fins of other fish.

(M. Ebert/T. Nohl)

[Sciencerocks]

Paleontologists discover new sauropod species in Argentina
November 3, 2018
 

A team of Spanish and Argentine paleontologists have discovered the remains of a dinosaur that lived 110 million years ago in the center of the country, the National University of La Matanza revealed Friday.

The remains came from three separate dinosaurs from the herbivorous group of sauropods, the best known of which are the Diplodocus and Brontosaurus. This new species has been named Lavocatisaurus agrioensis.

"We found most of the cranial bones: the snout, the jaws, a lot of teeth, also the bones that define the eye sockets for example and, in that way, we were able to create an almost complete reconstruction," said Jose Luis Carballido, a researcher at the Egidio Feruglio museum and the national council of scientific investigations.

Parts of the neck, tail and back were also found.

"Not only is this the discovery of a new species in an area where you wouldn't expect to find fossils, but the skull is almost complete," added Carballido.

The remains belonged to an adult of around 12 meters (39 feet) in length, and two minors of around six to seven meters.

 

Read more at: https://phys.org/new...entina.html#jCp

[wjfox]

A toast to the proteins in dinosaur bones

 

November 9, 2018

 

Burnt toast and dinosaur bones have a common trait, according to a new, Yale-led study. They both contain chemicals that, under the right conditions, transform original proteins into something new. It's a process that may help researchers understand how soft-tissue cells inside dinosaur bones can survive for hundreds of millions of years.

 

A research team from Yale, the American Museum of Natural History, the University of Brussels, and the University of Bonn announced the discovery Nov. 9 in the journal Nature Communications.

 

Fossil soft tissue in dinosaur bones has been a controversial topic among researchers for quite some time. Hard tissues, such as bones, eggs, teeth, and enamel scales, are able to survive fossilization extremely well. Soft tissues, such as blood vessels, cells, and nerves -- which are stored inside the hard tissue -- are more delicate and thought to decay rapidly after death. These soft tissues are composed mainly of proteins, which are believed to completely degrade within about four million years.

 

Yet dinosaur bones are much older, roughly 100 million years old, and they occasionally preserve organic structures similar to cells and blood vessels. Various attempts to resolve this paradox have failed to provide a conclusive answer.

 

"We took on the challenge of understanding protein fossilization," said Yale paleontologist Jasmina Wiemann, the study's lead author. "We tested 35 samples of fossil bones, eggshells, and teeth to learn whether they preserve proteinaceous soft tissues, find out their chemical composition, and determine under what conditions they were able to survive for millions of years."

 

The researchers discovered that soft tissues are preserved in samples from oxidative environments such as sandstones and shallow, marine limestones.

 

Read more: https://news.yale.ed...-dinosaur-bones