I start my Invertebrate Paleontology classes with an unknown fossil given to each student. I pick something I have enough examples of so that everyone gets the same species. As their first assignment, the students are asked to identify their fossils as specifically as possible using whatever method works, short of asking me or my teaching assistant. Once they’ve identified their specimens, they are then asked to provide an age and likely location of collection. The beautiful fossils above were the unknowns for this semester’s class. Do you know what they are?
These are specimens of the trepostome bryozoan Prasopora falesi (James, 1884) from the Decorah Formation (Katian, Upper Ordovician) of Decorah, Iowa. They were collected by Rachel Wetzel (’17) as part of our Team Minnesota expedition in 2016. Four of my current students figured this out to the species level! Most knew we were in bryozoan territory.