In looking back over the stratigraphy of the Grand Grove formation I conclude that the beds on the Bare Head are within 100 feet of the Basque sandstone. In collecting at the "silver mine" at Little Basque the few fossils seen indicate that the species are the same as those of the Bare head although the horizon is within 20 feet of the base of the Basque sandstone. All the localities along the canyon road are within the upper 200 to 300 feet of the Grand Grove formation. In none of these beds are the Canada - falls ammonite and while in the lower 100 feet of this formation, at that level they practically make up the beds while other fossils are practically absent except Dalmanites. If all of number 8 - Grand Grove formation - is equal to the Oriskany, i.e. the original Oriskany (= Upper Oriskany) and Canada - falls group of Esopus of New York then no.7 with its Chonetes canadensis fauna must be the equivalent in time of the Lower Oriskany. If this correlation is correct and the further