Work in the last few years has brought out several interesting facts regarding the stratigraphy of the Ellenburger limestone of the Central Mineral Region of Texas. The senior author spent about six weeks in the area, measuring detailed sections and making many fossil collections. Later both authors spent a week revisiting most of these sections and making additional collections. Still later the junior author spent another week in the area in company with E. O. Ulrich, again revisiting many of the sections and adding to the fossil collections. All the fossils have been studied in considerable detail by Ulrich and the junior author and compared with collections from equivalent strata elsewhere.
That our use of formation names may not be confused, it is imperative that we determine just what boundary Paige 5 intended to draw between the Wilberns and the Ellenburger. In the area . . .