Baculites compressus, Pierre Shale Formation, South Dakota. This rare and beautiful 73-million-year-old Baculite specimen is a must for any serious ammonite collector. This 9-inch uncoiled Baculite is prepared with both its sutures and ammolite displayed. This Baculite was bitten off at the body chamber/phragmocone connection. Collected within the past decade and part of the Artist’s personal collection. Comes with label and color brochure.