Check the listing for details. Turtle Shell Fossil - Hell Creek Fm. - Wibaux Co., MT - 1 Per Purchase. Condition: Used. Listed at 6.38 USD. Species: Testudines indet. Formation: Hell Creek Formation Locality: Wibaux County, Montana Age: Maastrichtian Cretaceous, 69-66 million years old A Single Piece of Fossil Turtle Shell from the Hell Creek Formation in Wibaux County, Montana. Please message with which one you'd like! If buying 5 or more, please message us to work out a deal! We do combine domestic shipping! Shipping cost is built into many of our items that have free shipping, so if you order multiple items at once, we will refund the difference! If you are an international buyer, please either buy all of your items at the same time in the same order, or message us so we can combine the listing. If you buy them separately, the eBay Global Shipping Program will not allow us to combine the shipping.