PALEO

paleo

Unique teeth helped vegetarian dinosaurs

Although the Tyrannosaurus rex might’ve been one of the most fearsome dinosaurs to roam Earth, it wasn’t the most common. That honor belonged to a group of vegetarian duck-billed dinosaurs called hadrosaurs. And now, scientists have uncovered the secret to their success: their teeth.

21 Oct 2016

Travels in Geology: Tumbler Ridge: Finding dinosaurs — and their predecessors and descendants — in northeastern British Columbia

Tumbler Ridge Global Geopark got its start when an 8-year-old found a dinosaur footprint and convinced his father to call the experts. Today, visitors can see an exceptional source of fossils from the Precambrian through the Pleistocene, along with stunning scenery.

18 Oct 2016

Humans, megafauna coexisted in Patagonia before extinction

During the last ice age, giant mammals roamed the wide-open steppes of what is now Patagonia. Around the time that humans were making their way down through North America and into South America, the climate began warming and large species of giant sloths and saber-toothed cats soon disappeared. Now, researchers looking at mitochondrial DNA from some of these megafaunal species are shedding light on the timing of the extinction and whether encroaching humans or changing climate — or both — were to blame for their disappearance.

11 Oct 2016

Antarctic no place to hide during end-Cretaceous extinction

The end-Cretaceous extinction is famous for killing off the dinosaurs, but many other species perished as well. A new study in Nature Communications of marine fossils found in the Antarctic indicates that the extinction event was just as deadly for creatures in the polar regions.

07 Oct 2016

Mammals hit harder than thought by end-Cretaceous extinction

Mammals, unlike the remaining nonavian dinosaurs and many other animals, are thought to have fared relatively well through the massive meteorite impact and protracted volcanism at the end of the Cretaceous 66 million years ago. After the extinction, mammals went on to dominate terrestrial ecosystems. But new research indicates that mammals might have taken a bigger hit than paleontologists have realized: Instead of about 75 to 85 percent of species going extinct, as prior studies suggested, it looks like about 93 percent of all mammal species may have gone extinct during the Cretaceous-Paleogene (K-Pg) extinction.

05 Oct 2016

Down to Earth With: Fossil preparator Bob Masek

When paleontologists unearth a fossil and rock still entombs part of it, they take it to someone like fossil preparator Bob Masek, who cleans and prepares the fossil for scientific study, and sometimes for display in a museum. In the 1990s, Masek helped prepare “Sue,” the most complete Tyrannosaurus rex fossil ever discovered, which now stands in Chicago’s Field Museum of Natural History.

 
30 Sep 2016

New species of uniquely horned dinosaur identified

The Triceratops family tree just got a little spikier. A decade ago, a retired nuclear physicist uncovered the large skull, legs, hips and backbone of a dinosaur on his land near Winifred, Mont. Now, the remains have been identified in a new study as a new member of the ceratopsid family, dubbed Spiclypeus shipporum, meaning “spiked shield.”

 
23 Sep 2016

Hammerhead herbivore pioneered vegetarianism in Triassic seas

New fossils found in southern China hint that the earliest herbivorous marine reptiles got off to a bizarre start: Atopodentatus unicus, which lived about 244 million years ago and sported a unique hammerhead-like snout for grazing underwater plants, sheds light on how the earliest marine reptiles began experimenting with herbivory after the Permian mass extinction, which killed off 96 percent of marine organisms about 252 million years ago. This “Great Dying” event left vast holes in the ecology of the Early Triassic, and a diversity of new feeding styles evolved to occupy the open niches.

 
21 Sep 2016

Scaling up: Mega-dino babies were mini adults

Even the largest dinosaurs to walk the planet had to start out small, hatching out of eggs, but whether these were miniature versions of adults has been a long-standing question. Now a new study looking at fossils belonging to a specimen of Rapetosaurus krausei, a type of titanosaur, that died at just a few weeks of age is revealing just how fully formed some of these eventual giants were at an early age.

25 Aug 2016

Ancient dinosaur migrations analyzed

Many studies have sought to track the movements of dinosaurs as they migrated across the supercontinent Pangea before and during its breakup. Now, researchers using a method called “network theory” have shed new light on dinosaur migration patterns.

24 Aug 2016

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