Paleontologists in Bristol, England, at the annual meeting of the Society of Vertebrate Paleontology report on fish fossils in Wyoming, the loss of Australia’s megafauna and the smallest dinosaur tracks. (p. 8)

Paleontologists discover fossilized skeleton of bus-sized marine reptile that had teeth with serrated edges.

Analyses of chromium isotopes in banded iron formations suggest oxygen levels fell for a period after the Great Oxidation Event. (p. 11)

Large meteoroids are probably more common than telescopic surveys suggest, new analyses find.

A big boost in coal burning, especially in China, is adding aerosols to the stratosphere.