This week on Fossil Friday, I bring you another great fossil (or set of fossils) from Dan Phelps, the president of the Kentucky Paleontological Society. This photo has two different species in it, one stacked over the other. They were found in Kentucky and date from the Upper Ordovician.
What are they? How specific can you get?
Dan is not allowed to guess again this week, but he is welcome to taunt the commenters!