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Benchmarks: October 4, 1915: Dinosaur National Monument Founded

While moving across the country from California to Michigan two years ago, I stopped at Dinosaur National Monument, or “Dinosaur,” which today covers 85,000 hectares and straddles the northern portion of the border between Colorado and Utah. I camped at the Green River Campground on the Utah side, and from there, Split Mountain, on the western margin of the east-west-trending Uinta Mountains, glowed violet-pink in the sunset light. 
04 Oct 2015

Dinosaurs used the same nests repeatedly

Fossil dinosaur eggs and nests offer clues about dinosaur development and behavior: Based on past work, for example, scientists have thought that some dinosaurs, like oviraptors, brooded, or sat on their eggs, much like modern birds do. Now, the results of a new study describing two fossil egg nests suggest that some dinosaurs used the same nesting sites again and again.
23 Sep 2015

Gender equity in dino bones

Modern birds like cardinals and peacocks offer some of the most dramatic examples of sexual dimorphism on Earth, with males and females varying in size and/or displaying different plumage, among other differences. But whether the two sexes of birds’ dinosaur ancestors also possessed different physical characteristics has long been debated. Now, in a new study, scientists using state-of-the-art measuring techniques to look at Protoceratops — a frilled, horned relative of Triceratops that’s found abundantly in the fossil record — are questioning past notions about whether the sex of specimens can be distinguished based on their fossils.
17 Sep 2015

Closing a gap in the tetrapod fossil record

The story of how fish evolved into four-legged land animals called tetrapods has long been left incomplete by a 15-million-year gap in the fossil record, known as Romer’s Gap, which stretches from the end of the Devonian Period into the Carboniferous. Whether the gap is due to the actual absence of tetrapod fossils from this interval, or whether such fossils exist but have not been found yet has long remained unclear. A new study, however, shows tetrapod fossils from the base of the gap, adding to a growing list of discoveries that appear to be closing the gap.
07 Sep 2015

Oldest birds unearthed in China

The discovery of two well-preserved fossils in the Sichakou Basin of northeastern China has pushed back the known evolutionary record of birds by as much as 6 million years, according to a new study published in Nature Communications.
24 Aug 2015

Ancient marine reptiles born alive and ready to hunt

Mosasaurs, giant marine reptiles found in all the world’s oceans during the Late Cretaceous, may have reached up to 18 meters in length, and they were fearsome predators. Little is known, however, about newborn, or neonate, mosasaurs because very few have been found. Now, new research describing a rare fossil find from Kansas reveals that mosasaurs likely gave birth to live young that were born swimming and able to survive alongside the adults.
23 Aug 2015

A terribly low voice for a new terror bird

A recently discovered fossil skeleton is giving paleontologists a nearly complete look at a new species in the family of big-beaked giants known as “terror birds.” Thought to have grown as tall as 3 meters, these flightless birds roamed South America as apex predators before going extinct about 2.5 million years ago.
12 Aug 2015

From fearsome predator to filter feeder

Early in the Paleozoic, giant arthropods known as anomalocaridids were the largest predators in the sea. A collection of finely preserved fossils, described in a new study in Nature and belonging to the Early Ordovician Fezouata Biota of Morocco, is now giving paleontologists a more detailed look at a 2-meter-long variety called Aegirocassis benmoulae. The fossils seem to suggest that at least this species wasn’t a predator after all.
10 Aug 2015

Makeovers for two popular dinosaurs

Two of the most recognizable dinosaurs are getting image makeovers. According to recent research, tyrannosaurs weren’t only fearsome predators with a taste for other species, but also may have been cannibals; and Brontosaurus, long thought to be obsolete — as a distinct genus at least — may be making a comeback.
06 Aug 2015