222 



O. S. Grosser — Upper Hamilton and 



1. Tropidoleptus carinatus (Con.) Hall 



(a) 



2. Spirifera mucronata (Con.) Bill, (rr) 



3. Leiorhynchus multicosta Hall (r) 



4. Orthis Vanuxemi Hall (rr) 



5. Palceoneilo emarginata Con .(rr) 



6. Nucula lirata (Con.) Hall (?) (rr) 



1. Phacops rana (Green) Hall (rr) 



Above this zone about twenty-five feet of rather sandy lime- 

 stone alternating with shales are exposed, and above the lime- 

 stone twenty feet of black, fissile shale in which no fossils were 

 found. Overlying the black shale are thin, regular sandstone 

 layers, one-fourth to one-half inch thick which at first alternate 

 with blocky, blackish argillaceous shales. The sandstones 

 gradually become thicker for some distance and then are over- 

 laid by blue, smooth shales which weather to an olive color. 

 Beyond Upperville, twenty-five feet above the highway along 

 which the black shales are exposed, a small quarry has been 

 opened in the sandstone in which an occasional fossil occurs. 

 Some search revealed only the following forms : — 





1. Lunulicardium fragile Hall 



2. Leiopteria sp 



.(rr) 

 .(rr) 



3. Crinoid stems. 



Leiorhynchus mesocostalis Hall (rr) 



A single specimen of the last species was found, which was 

 not surely in place in the quarry, but possibly came from higher 

 up the hillside. 



The section on the upper part of Pleasant brook and the one 

 just described on the hillside below Upperville, taken in con- 

 nection with the one up the hill west of Smyrna show a pas- 

 sage from bkie, argillaceous shales containing an abundant 

 Hamilton fauna, up through the impure Tully limestone, the 

 black Genesee shale, a sandstone zone and another of blue 

 shale into coarse arenaceous shales or thin sandstones contain- 

 ing a meagre fauna, the species of which are found in the 

 Portage and Ithaca groups. It seems to me there is no ques- 

 tion but that the section passes from the Moscow shale of the 

 upper Hamilton through the Tully limestone and Genesee 

 shale into the lower Portage. 



At Sherburne there are not such clear sections of the transi- 

 tion deposits from the Hamilton to the Portage, as at Smyrna ; 

 but there are excellent exposures of the upper Hamilton 

 as well as some of the moderately fossiliferous overlying 

 Portage. 



Along Mad brook east from Sherburne village for one mile 

 to Harrisville, rising from about the R. R. level to an elevation 

 of 240' above, at the reservoir in Harrisville, are numerous 

 and excellent exposures of blue argillaceous shales with some 

 coarse blue arenaceous shales forming the upper portion of the 

 Hamilton stage. A limited search in the shales along Mad 

 brook yielded the following species : — 



