I see these every once in a while, but I can't seem to locate any information on them. The shape is fairly consistent involving a tapering "cone" with a bulbous end. I'm hoping with such a distinct shape, someone with knowledge of Byrozoa may be able to assist me with a possible genus or family.
Middle Ordovician, Blackriverian
(similar in age to the Bromide Formation of Oklahoma)
Platteville Formation, Mifflin member
Southwest Wisconsin
All pictured measure around 3cm
These are 3 different specimens on the same hash slab:
Thanks,
Caleb