Let's show off pieces of our collections, with a twist: Every person who posts a piece posts one that is 1 geologic time period younger than the last.
Example: If a Jurassic crustacean is posted, the next post needs to be something from the Cretaceous, and so on.
Starting from the Cambrian going all the way to the Pleistocene (Cenezoic time periods will be divided into the epochs, since they're more commonly referenced), and looping back to the Cambrian after someone posts something from the Pleistocene. Let's see how long we can keep the descending order going!
I'll start with a Barrandagnostus inexpectens agnostid plate with other trilo-bits on a Cambrian shale slab from the Conasauga Formation: