GEOLOGY OF THE WATKINS AND ELMIRA QUADRANGLES 1 3 



along the Genesee river between Smoky Hollow and St Helena and 

 along the shore of Lake Erie in the vicinity of Silver Creek. 



Fossils are nowhere abundant but they are fairly common in a 

 few horizons in the lower part. At 648 feet A. T. on the road from 

 Montour Falls to Odessa, Spirifer laevis occurs in a 3 inch 

 calcareous sandstone near the bottom of the formation. At about 

 the same horizon in Havana glen are Productella speci- 

 osa, Schizophoria impressa, Atrypa reticu- 

 laris and C e n t r o n e 1 1 a j u 1 i a ? ; at 730 feet A. T. in soft 

 shales, Manticoceras pattersoni, Loxonema noe, 

 Honeoyea erinacea; at 772 feet A. T. Manticoceras 

 pattersoni, Orthoceras, Atrypa reticularis, Cyr- 

 t i n a h a m i 1 1 o n e n s i s , Cladochonus ; at 782 feet A. T. 

 Manticoceras pattersoni, Chonetes scitulus, 

 C. lepidus, Productella spinulicosta. Strop h- 

 alosia truncata, Leptostrophia mucronata, 

 Spirifer su bum bona, Cladochonus ; at 803 feet A. T. 

 Leptostrophia mucronata, Chonetes lepidus, 

 Schizophoria impressa, Buchiola speciosa, 

 Honeoyea erinacea and Lunulicardium orna- 

 t u m ; at 849 feet A. T. Manticoceras pattersoni; at 

 about 868 feet A. T., in the Rock Stream ravine, occur Manti- 

 coceras pattersoni, Probeloceras lutheri, 

 Tornoceras uniangulare, Bactrites, Buchiola 

 speciosa, Paracardium doris, Pterochaenia 

 fragilis, Styliolina fissurella, Bellerophon 

 koeneni, Chonetes scitulus, Lingula cf. spatu- 

 la ta. In the quarry at Odessa, 1020 feet A. T., Buchiola 

 speciosa, Paracardium doris, Pterochaenia 

 fragilis and Palaeoneilo sp. occur. 



It will be observed from this series of faunas that there are dis- 

 tinct oscillations between the western or true Naples fauna and the 

 eastern or brachiopod fauna with some slight degree of intermingling 

 of the two. For the most part however, here as elsewhere in this 

 section, these two faunal elements are clearlv distinct. 



