10 NEW YORK STATE MUSEUM 



or dovetailing of tlie east and west faunas as has been brought out 

 in previous discussions of these faunal relations. 



E.vposnres. The Cashaqua shales are exposed in the Havana glen 

 from the lowest outcrop upward for about 150 feet to near the base 

 of the Bridal Veil falls. In Montour Falls ravine to the level of the 

 first highway ridge ; along the road from Montour Falls to Odessa 

 up to 650 feet A. T. ; in the ravine and quarries i mile east of Mon- 

 tour Falls; in Watkins Glen for 175 feet from the lowest rock ex- 

 posure ; in Excelsior glen i mile east of Watkins and along the 

 road to Burdett to the first forks ; the lower beds are shown along 

 the Northern Central Railroad from Watkins to Salt point and the 

 vipper part in Rock Stream and Big- Stream gorges to 40 feet below 

 the level of the railroad tracks ; also at Hector falls and Glen 

 Eldredge, from the lake to the highway bridges. The Cashaqua 

 shale is conveniently exposed at the following localities west of the 

 Seneca lake valley : in ravines and low cliffs along the east and west 

 shores of Keuka lake south of Bluff point ; in the Belknap gully, ^ 

 mile north of Branchport; in Parrish gully and many other ravines 

 in the Naples valley; in Stony Brook glen at Dansville; along Cash- 

 aqua creek and the Western New York and Pennsylvania Railroad 

 from Sonyea to Tuscarora; in the Genesee river gorge for 25^ miles 

 south of Mt Morris ; in the ravine west of Wyoming ; in the ravine 

 at Griswold, 6 miles west of Attica ; in the bottom and sides of the 

 Eighteen Mile creek gorge at North Evans and on Pike creek, 5^ 



mile from Lake Erie. 



Parrish limestone 



We have already applied this name to an impure concretionary 

 limestone, which in this region, occurs in nodular layers from 2 to 6 

 inches thick, separated by soft blue olive shales. This formation 

 can be recognized in but few outcrops on this quadrangle and is not 

 yet known east of the Seneca lake valley. It is continuous from 

 here westward as far as the Naples valley where it consists of a 

 single layer 4 inches in thickness, 50 feet, 8 inches below the top of 

 the Cashaqua shale. In Italy hollow the next valley east of Naples 

 it is a compact layer 8 inches thick. In the Belknap gully near 

 Branchport it is 10 inches thick and 25 feet below the top of the 



