27 Ithaca Group 27 



morpha quadrulaf 



Station j. — 97 feet above Station i. 



The following species were obtained at this station: Microdon 

 gregarius, Modioniorpha subalata var. chemtingensis, Ryrichonella 

 eximia, Lingida spatulata, Produftella speciosa, Nucula diffidensf , 

 Palcsoneilo constrifla a, Leiorhyyi clues mesacostalis a, Chonetes scitula, 

 PaIcB07ieilo plana f 



Station ^. — 162 feet above Station i. 



The following species were obtained from the dark arenaceous 

 sandstone above the falls: Spirifer mesacostalis c, Cyrtina hamil- 

 tonensis, Sti£lopora nieeki, Modioniorpha subalataf, M. szibalata 

 var. chemunge7isis, Palceoneilo constriHa, Nticula corbuliformis? , 

 Leda diversa, AHinopteria perstrialis a. 



This station is the first of this section in which Spirifer mes- 

 acostalis occurs in abundance and marks the beginning of the 

 typical Ithaca fauna. 



Station 5. — At the foot of the dam, 182 feet above Station i. 



The sandstone flags here contain an abundant fauna similar 

 to that in the University quarry. The following species were 

 identified: Spirifer mesastrialis a, 6". mesacostalis a, Cryptonella 

 eudora, Cyrtina hatniltonensis ^ Stiflopora meeki, crinoid stems. 



Station 6. — 35 feet above the last station. 



The following characteristic species of the Ithaca group occur 

 here abundantly: Atrypa reticularis, Spirifer mesacostalis, Stro- 

 phodonta mucronata, Produ5lella speciosa. 



Station 7. — 242 feet above Station i. 



The following species occur here in the arenaceous, shelly 

 sandstone: Strophodonta mucroriata, Spirifer mesacostalis, Atrypa- 

 reticularis, Mici'odon bellistriatus. 



Section VII, McKinney's Station. 



This se(?tion extends from the base of the lower Portage into 

 the Ithaca group. The exposures on which it is based occur 

 along the east side of Cayuga lake from the point where the 

 Genesee disappears beneath the lake to McKinney's station, and 

 in the north glen at the station. 



Station i. — At the sinking of the Genesee beneath the lake. 



About 10 feet above the lake, in the Portage shales, two 



species occur in some layers rather abundantly. These are Glyp- 



