Fortier published a boxed set of maps and scientific papers that revealed its geology in detail for the first time. The maps unfold as illustrations that have color codes for the types of rocks contained in each area; for example, green for Cretaceous rocks, yellow for Jurassic layers, and purple for Devonian Age ones. The beauty of the maps belies their significance. They are the entrée for scientists like me to study the region. To find a fossil fish that is close to the ancestry of land-living creatures—a fish with arms—we zeroed in on regions colored purple.
