A few weeks after my mother found her most recent cidarid in an Edwards formation check dam, I took a few minutes to swing by the same dam to see for myself what else could be found. Within minutes I dug up a cylindrical fossil that for a few weeks puzzled me due to its resemblance to a belemnite phragmocone. Then on Wednesday night I went to the DPS meeting and afterwards met briefly with Professor Andy Gale and showed him this specimen. He identified it as a rudist and immediately corroborated that with another DPS member familiar with rudists. What confused me is that it doesn't look like a