Does anybody know anything about Triassic coleoids such as the attached Atractites? There are two in the slab, the larger being 95 mm long. At the top is a chambered orthocone (Michelinoceras). These are from the Middle Triassic Prida Formation of Nevada. From the outside they look like belemnites, but I polished a partial specimen and see that it is totally recrystallized (originally aragonite?).