fauna are here in the museum. The following is the appearance of the dome along the main canyon grade, From a study of the Rockwood the next day along Armuchee creek and in O'Brien gap it is seen that the top of this formation as present is the different places in various. This variability I think is best explained by assuming that the Rockwood has suffered considerable erosion during the long interval from Niagara to Osage time. The Armuchee creek therefore lies upon different parts of the Rockwood.