Trace fossil specimens of *Skolithos*, which are vertical burrows (PRI 80026). This rock was collected from the Devonian Enfield Formation of Tompkins County, New York. Specimen is part of the research collection of the [Paleontological Research Institution](http://www.priweb.org), Ithaca, New York. Rock is approximately 15 cm in length. Model by Emily Hauf.