Scientific name: †Acheroraptor temertyorum? (Evans et al., 2013) - family Dromaeosauridae - Theropod raptor Dinosaur Location: Private Ranch in Wyoming, USA Geological Formation: Lance (Creek) Formation Age: Late Cretaceous, Maastrichtian stage, (~67-68 Million Years) Size: 7mm REF.: #S180 DESCRIPTION: While Acheroraptor is primarily known from the Hell Creek Formation, some fragmentary remains, including teeth, have been found in the geologically similar Lance Formation from the same time period. These fossils are from the late Maastrichtian age (around 66 million years ago). Identifying Acheroraptor teeth can be challenging, but they may have subtle apicobasal ridges and different-sized serrations on the anterior versus posterior sides of the crown. Key details about Acheroraptor teeth in the Lance Formation: Geological context: Fossils from the Hell Creek and Lance Formations are from the same late Maastrichtian age and often include similar faunas. Age: The fossils date to approximately 66 million years ago. Identification: Acheroraptor teeth are small theropod teeth that can have specific characteristics, though they are hard to distinguish from other small theropod teeth in the formation. Diagnostic features (may be subtle): Serrations: The anterior (front) and posterior (back) carinae (edges) can have different-sized serrations. Ridges: The crown may have apicobasal ridges, which run from the tip towards the base. Identification challenges: The limited and fragmentary nature of the teeth can make identification difficult. It is also possible for other dromaeosaurids or similar-toothed theropods to be present. All of our fossils come with a Certificate of Authenticity. Every week, the issued Certificates of Authenticity are updated in our database verification system on our website. If you find that your certificate has not yet been updated, please contact us and we will update it immediately. Display box included. IMPORTANT SHIPPING INFORMATION: All shipments to the USA are sent via UPS Express. We are not responsible for any additional tariff charges that US Customs may add as import fees on the declared commercial value.