Clakke — Oneonta, Ithaca and Portage Groups. 



3 7 



Strqpheodonia demissa, the Chemung variety. 

 Lwrhyrtch us ghbwMformis. 

 Leptostiroph ia m ucropata. 

 Spirifer Iwvis. 



4, Is 1 75 feet higher and twenty-five feet below the summit of the hill. 

 The rock exposed consists of sandy shales, with some soft olive shale inter- 

 calated. Fossils are apparently abundant, and the following have been iden- 

 tified : 



I/yriqpecten cf. interradiatiis. This shell is usually of small size and, on 

 the whole, is nearer to the form suggested than to L. tricostatus. It will be 

 observed that the normal form of the latter species is present in the Flag Gulf 

 section given below. The two species differ only in the number of finer inter- 

 calary ribs between the principal plications; these in L. interradiat/us are few, 

 sometimes no more than a single one, but in L. tricostatus they may number 

 three to five. The former species has thus far been recorded only from the 

 shales of the Hamilton group at Fultonham, Schoharie county, while L. iri- 

 COStat/us, though generally found in the normal Chemung fauna, occurs in 

 undoubted Hamilton beds at Summit, Schoharie county, where it is associated 

 with Chonetes syrtalis. 



Schizodus Cliemungensis. 



Actinopteria of the type of Boydi, eta, etc. ; much larger than the pre- 

 vailing form of the latter, with very distinct surface characters ; probably ;) 

 distinct species. 



Spathella tijpica. 



Palxeoneilo cf. plana. 



Palcwneilo cf. muta. 



Grammy sia cf. communis. 



Belle I'oplion Maera. 



Plewrotomaria cf. Itys / a variety. 



Scldzophoria impressa, as above. 



At r ypa reticularis, as above. 



Productella spedosa. 



Stroplieodonta demissa, as above. 



Spirifer mucrrmatus, both forms as above mentioned. 



Spirifer Iwvis. 



Species of especial interest in the last two localities are Leptost/rophia 

 mucronata and Sp>irifer Icevis. The former is abundant in a thin calcareous 

 layer, is uniformly of small size, and though without mucronate cardinal 



