Here is an oddball brachiopod I've had in my collection for a while but didn't really know much about. The label that came with it listed Unispirifer from the Banff Formation in Western Alberta. A quick search on Paleodb.org found it hailed from the lower Carboniferous (Mississippian, Tournasian stage). It's a bit rough but the pedicle valve shows a little detail still. Update 01/27/13: Sharp eyed reader Howard pointed out that this is more likely Cleiothyridina lata, not an Unisprifer.