I am a regional sedimentary geologist at Idaho State University. Having been here 35 years I have been interested in all the geologic diversity of Idaho, and am a co author on the new Idaho State Geologic Map. In the last 20 years I and my students have been using the ages of detrital zircons to learn more about ancient sandstones. In this case, using these zircons to help better understand fish evolution on the western Snake River Plain is a natural fit.