Calcareous nannofossils and dinocysts date the base of the Clayton Formation in south-central Alabama as Danian in age. The first occurrences of Biantholithus sparsus, Cruciplacolithus primus, ...

The Local newsletter is your free, daily guide to life in Colorado. For locals, by locals. Why we love it: Stunning views of downtown Denver from South Table Mountain’s precipitous eastern edge, with ...

Analyses of marine carbonates through the interval 63.9 to 65.4 million years ago indicate a near-constant flux of extraterrestrial helium-3, a tracer of the accretion rate of interplanetary dust to ...

There is a rocky cliff outside Colorado Springs called Corral Bluffs. It looks similar to many of the cliffs and bluffs found around this state, with layers of brown and red earth sparsely covered ...

A 6-mile-wide asteroid is believed to have killed the dinosaurs around 66 million years ago. Find out how big it was, where it landed and how we know the asteroid killed the dinosaurs. According to a ...

Curler, A. H. and Behrensmeyer, Anna K. 1996. "Models of Vertebrate Mass Mortality Events at the K/T Boundary." Geological Society of America Special Paper, 307 375–379.

Scientists basically agree that an asteroid struck the Earth some 65 million years ago and its impact created the Chicxulub crater in Yucatan, Mexico. More controversial is the link between this ...

LAWRENCE -- A study to be published Monday in the Proceedings of the National Academy of Sciences offers a scientific first: a detailed snapshot of the terrible moments right after the Chicxulub ...