This Specimen has been sold.
Bargain, 3.2" Fossil Dinosaur Vertebra - Judith River Formation
This is a 3.2", unidentified vertebra from the Judith River Formation, Montana. This vertebra is missing the process but shows good preservation of the compact (cortical) bone. This is likely, a caudal (tail) vertebra. There are a number of very visible, repaired cracks, hence the bargain price.