The Utica Shale is a stratigraphical unit of Upper Ordovician age in the Appalachian Basin. It can be divided into five stratigraphical units according to the geological sequence. BCE confirmed the accuracy of the stratigraphical dating 1550 by Kenyon. The traps are divided into sections based on their chemical, stratigraphical, and petrographical composition. He began work on his "Guide to the Stratigraphical Museum". On the top of the lunar stratigraphical sequence rayed impact craters can be found. The town also lends its name to the Viking Formation, an oil bearing stratigraphical unit. In 1966 Sinclair Hood built a new Stratigraphical Museum. The two younger stratigraphical units can be found in crater sized spots on the Moon. The Three Forks Group is a stratigraphical unit of Famennian age in the Williston Basin.