Fossils

fossil

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

19th-century discovery now reveals modern human arrival in Sumatra

Modern humans began journeying out of Africa by at least 75,000 years ago, eventually expanding across the planet. Evidence of these early human travels, including fossils and artifacts, is typically spotty and difficult to find. But one such discovery more than a century ago has shed new light on the appearance of humans in Southeast Asia.

19 Dec 2017

Transitional Chilesaurus fills gap between major dinosaur groups

In 2015, a new dinosaur was discovered in southern Chile, but its odd set of characteristics left paleontologists scratching their heads: Was it a carnivore or an herbivore? A closer look at the bones of the dinosaur, named Chile­saurus, is helping scientists determine how it fit into the Late Jurassic landscape.

06 Dec 2017

Can fossil footprints reveal the weight of a dinosaur?

Body mass is a fundamental factor in determining how much food an animal requires, how it moves and grows, and what role it plays in its ecosystem. Measuring modern animals is often a straightforward matter of putting them on a scale, but it’s no easy feat for paleontologists interested in extinct creatures like dinosaurs, since many of these animals’ weighty parts — their organs, muscles and skin, for example — are long gone. Frequent claims of “the heaviest dinosaur of all time,” for example, as in the case of the recently named Patagotitan, are fraught with uncertainty. Recent research, however, is offering a novel approach to estimating dinosaur body masses by examining the footprints they left behind.

27 Nov 2017

Marine megafaunal extinction discovered

Extinctions of large land animals during the Pleistocene are well documented. In a new study, scientists report that marine megafauna also suffered severe losses several million years ago, around the time that the first hominid ancestors were emerging in Africa.

17 Nov 2017

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