DISCOVERY, OUTREACH, AND EDUCATION IN THE MANCOS SHALE: SAMPLING CHONDRICHTHYAN TEETH FROM ANT HILLS IN EASTERN UTAH, USA
Other than abundant specimens of Pycnodontiformes, the rest of the identified teeth are those of members of Elasmobranchii. We found multiple morphotypes of Orectolobiformes. Ptychodus teeth were all fragmentary and consistent with taxa discovered by previous workers, such as P. c.f. mammillaris and P. whipplei. Lamniform taxa discovered thus far include Squalicorax c.f. S. falcatus, Scapanorhynchus, and multiple morphotypes of Cretoxyrhinidae. We identified a few examples each of the batoid taxa Protoplatyrhina and Pseudohyolophus. The sawfish Ptychotrygon c.f. P. triangaularis is particularly abundant and easily recognizable in this assemblage, likely owing to the robust nature of its oral teeth.
Focusing on sampling teeth from ant hills increases the potential sample size compared to traditional surface collection on outcrop. However, it does bias the sample to specimens that are small enough to be carried by the harvester ants. Though this ongoing project will undoubtedly provide a better understanding of the fossil fish assemblage of this portion of the Mancos Shale, it has already accomplished a number a broader impacts. Allowing the public to pick shark teeth at outreach events increases awareness of fossil resources in the area and has the potential to spark interest in science, especially among younger members of the public. This work also provided two of us with our first gateway into rigorous scientific research, presentation, and publishing prior to high school graduation.