76 



Report of the State Geologist. 



scaling these have often brought otherwise inaccessible points within reach. 

 The length of the exposure, cutting completely through from near the base of 

 the Havana valley t< > the top of the eastern hill makes the detailed section an 

 important one. As a whole the rocks are highly unfossiliferous. Fossils are 

 found only at wade intervals in thin layers and in small numbers. This 

 feature, however, is a characteristic of the strata in this meridian, where the 

 fauna is distinctly less prolific than in the Cortland and Chenango county 

 sections of the Ithaca beds and in the typical Portage beds of the western 

 sections (meridians of Oanandaigua lake and the Genesee valley). 



The commencement of the rock exposure in the Havana glen lies at the 

 summit of the delta plain of the stream which rises to no great elevation above 

 the road. 



XIV 1 . The beginning of the rock section affords soft, sandy shales, 

 containing Bitch tola speciosa, shown in the exposure below the entrance house 

 and in the first falls, known as the " Portal Cascade 1 ' (Plate VI, 1). 



Thirty-three feet above the entrance is a band of black, fissile, pyritous 

 shale, seen on the approach to the first foot bridge, and not far above, in the 

 escarpment of "Eagle Cliff" (Plate II), are thin sand}- layers with beautiful 

 specimens of Plumalina pi it miliaria. 



XIV' 2 . At the top of the "Council Chamber" (Plate VI, 2, 3) and near the 

 foot of the "Curtain Cascade" (elevation ninety-five feet above entrance) [Plate 

 III ] are some compact soft shales in which the following species are found : 



Oladochon us (cc) . 



Amboctdia u at honata. 



Cyrtina ffamiltonensis. 



Atrypa reticularis. 



leptostrophia mucronata. 



Palceoneilo constricta. 



P. cf. Icumellata. 



Loxonema Noe. 



Diaphorostoma, a small, ventricose, undescribed species occurring in the 

 Portage fauna of the Naples section. 

 Ma ii ti <■<><•(' rax Patermn. i. 



XIV \ Along the bridge approaching the "Curtain Cascade" and at a 

 slightly greater elevation than the last, occur 

 8ch vzophoria impressa. 

 Cf /ifronclla Julia. (() 



Atrypa reticularis, small and coarse-ribbed, .and large, elongate forms. 



