GEOLOGY AND PALEONTOLOGY OP THE SCHOHARIE VALLEY 295 



Feet Total 



Schoharie grit 3-38il 



A dark, impure limestone wliicli weathers to a 

 buff, porous sandstone. Ttie erosion of the On- 

 ondaga limestone has left this formation well 

 exposed at Clarksville both at the foot of the 

 upper gorge and the top of the lower and fossils 

 may easily be collected from it. Among the fos- 

 sils found here are : 



1 Stroplionella ampla (Hall) H. d C. v 



2 Atrypa reticularis (Lin.) D al.^= Atiyps. impressa H. aa 



3 Pentamerella arata (Con.) 11. a 



4 Meristella (Pentagonia) unisiilcata {Con.) H. vv 



5 M. nasuta {Con.) H. aa 



6 Genti'onella glaiis-fagea H. r 



7 OrtMs (Rhipidomella) peloris H. (?) rr 



8 0. (R. ) alsiis H. v 



9 O. (Schizopboria) propinqua H. (?) rr 



10 Spirifer raricosta (Con.) H. r 



11 S. duodenarius H. rr 



12 S. iimbriatus (Con.) Bill, rr 



13 Orthothetes pandora (Bill.) H. d C. rr 



14 Chonetes bemisphericus H. r 



15 Cyrtina bamiltonensis U. rr 



16 Stropbeodonta perplana {Con.) II. rr 



17 S. inaequiradiata H. rr 



18 S. demissa (Con.) H. r 



19 Coelospira Camilla H. r 



20 Ampbigenia elongata {Van.) H. rr 



21 Cypricardinia plannlata {Con.) H. r 



22 Gonocardium cuneus {Con.) S. A. Miller c 



23 Pbacops cristata H. r 



24 Dalmanites ancbiops {Green) H. r 



25 Ortbocerais zeiis H. (?) rr 



26 O. sj). c 



27 Cyrtoceras cf. eiigenium H. rr 



28 Zapbrentis sp. a 



External inii)rossinn. 



29 Streptelasma sp. c 



External impression. 



Esopus shales 121-383 



Blackish, arenaceous shales with S p i r o p h y - 

 ton caudagalli (Van.) Hall. The upper 

 five or six feet of this formation is a very heavy 

 sandstone, somewhat calcareous, which seems to 

 gradually pass into the Schoharie grit. Only 

 that however, which contains fossils has been 

 referred to the Schoharie. 



Oriskany sandstone . .* 1-262 



A brownish black, crystalline sandstone which 

 weathers to a light brown porous sandstone. In 

 the creek about a mile below the village this rock 

 is almost black and at the same distance north 



