Fossils

fossil

Growing up saber-toothed: Strong from the start

During the Pleistocene, saber-toothed cats were formidable predators, with their massive canines and powerful front legs sporting razor-sharp claws. The bones of saber-toothed cats are thicker and more robust compared to those of other large cats, both modern and extinct. And previous studies of Smilodon have shown that their forelimbs in particular featured several adaptations, including thickened cortical bone, which would have increased strength, presumably useful in subduing ambushed prey.

19 Feb 2018

Did mud volcanoes set the stage for Burgess Shale fossils?

Canada’s Burgess Shale is famous for a wide array of exquisitely preserved 500-million-year-old fossils, which are found in a dozen localities in the Canadian Rockies. Linking all these localities today is a geologic feature called the Cathedral Escarpment, which formed in the Cambrian as a steep line of underwater cliffs where regular mudslides are thought to have gently buried a diversity of organisms, setting the stage for the prolific fossil beds. However, new mineralogical clues found at several of the fossil-rich sites suggest that mud volcanism may have also played a starring role in creating the Burgess Shale.

16 Feb 2018

Fossil sea turtle hatchling reveals its Eocene proteins

study of a 54-million-year-old sea turtle hatchling found in Denmark is adding to a growing body of evidence that certain proteins can remain intact in the fossil record for tens of millions of years.

08 Feb 2018

Fossil reefs show sea level rose in bursts

Off the coast of Texas, a collection of fossil coral reefs sits under 60 meters of water — relics from 20,000 years ago, when the sea surface was much lower than today. In a new study, researchers created high-resolution maps of the reefs that suggest they drowned as sea levels rose in rapid bursts — each lasting decades to centuries — instead of at a steady rate, as has long been assumed.

06 Feb 2018

Denali's Asian dinosaurs

Paleontologists have long hypothesized that a land bridge between present-day Siberia and Alaska served as a gateway for fauna to migrate between Asia and North America during the Cretaceous, but they have unearthed little evidence that directly supports this idea. Now, researchers have found an Asian dinosaur track assemblage in North America, a discovery that backs the longstanding hypothesis.

23 Jan 2018

Predators may have spurred evolution of ancient brittle stars

Threats to species can encourage evolution, leading to animals with harder shells or other defensive adaptations. In a recent study in the Journal of Systematic Palaeontology, researchers found that while some ancient brittle stars — relatives of starfish with long, whip-like arms — evolved in the face of threats, some adapted a different approach: they moved.

10 Jan 2018

Geologic Column: Celebrating Old Rock Day

Old Rock Day may not be a household-named holiday, but on Jan. 7, geoscientists and geology enthusiasts will encourage people to celebrate and learn more about old rocks and fossils. 
07 Jan 2018

Fossilized dinosaur feces reveal flexitarian diet

Fossilized feces tell paleontologists a lot about what dinosaurs ate. Some unusual coprolites discovered in Utah’s Grand Staircase-Escalante National Monument may indicate that normally herbivorous dinosaurs occasionally ate crustaceans.

03 Jan 2018

Mysterious Miocene bipedal footprints found in Crete

A curious set of 5.7-million-year-old bipedal footprints found in western Crete — far from the cradle of humanity in Africa and dating to the Late Miocene, long before hominins are thought to have walked upright — has paleoanthropologists scratching their heads.

27 Dec 2017

Down to Earth With: Paleontologist Ali Nabavizadeh

A perfect day in the life of paleontologist Ali Nabavizadeh wouldn’t be complete without a fresh corpse. The subjects of his work at the dissection table range from a rhinoceros, to an elephant head, to the human cadavers essential to the anatomy classes he teaches at Cooper Medical School of Rowan University in Camden, N.J. The only thing that could possibly top a fresh corpse, in fact, is an extremely old one.

20 Dec 2017

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