From the album: Lime Creek Devonian Rockford Iowa
Lioclema occidens common. One weird thing about Lime Creek Formation is the numbers of bryozoan species which was much more diverse in Ordovician become much more less diverse even thought similar environment - muddy subtropical seas. This is the largest rugose bryozoan left. All the others (so far not identified yet) are much smaller, less than .2 of a centimeter in diameter.