Phanerozoic marine communities: Ordovician – Permian (October 1 & 3)

We will begin this week with the Great Ordovician Biodiversification Event (GOBE), and end it with the ecological catastrophe of the Permian Extinctions. (A nice cheery note to send you off into Fall Break!) Along the way we will discuss the Sepkoski Marine Evolutionary Faunas with diagrams like the one below —

For lab this week, you’ll appreciate these links to the Ordovician Atlas, a Cincinnatian fossil guide, and a strat-paleo guide to the Cincinnatian.

Geology in the News —

A story to warm Andy’s heart: This Bolivian town sits astride at least 3500 dinosaur footprints. Such trackways are rich with paleoecological information. These trace fossils are Cretaceous.

I’m not sure this is really the first evidence that non-avian dinosaurs nested in colonies, but it is a good story. These nests are from the Upper Cretaceous of Mongolia.