GEOLOGY AND PALEONTOLOGY OF THE SCHOHARIE VALLEY 295 



Feet Total 



Schoharie grit 3-380 



A dark, impure limestone which weathers to a 

 buff, porous sandstone. The 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 Stropbonella ampla (Hall) H. & C. r 



2 Atrypa reticularis (Lin.) Dal.= Atrypa impressa H. aa 



3 Pentamerella arata (Con.) H. a 



4 Meristella (Pentagonia) unisulcata (Con.) H. it 



5 M. nasuta (Con.) H. aa 



6 Centronella glans-fagea II. r 



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



8 0. (R. ) alsns H. r 



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



10 Spirifer raricosta (Con.) H. r 



11 S. duodenarius H. rr 



12 S. fimbriates (Con.) Bill, rr 



13 Ortbotbetes pandora (Bill.) H. & C. rr 



14 Chonetes hemispbericus H. r 



15 Cyrtiua bamiltonensis H. rr 



16 Stropbeodonta perplana (Con.) II. rr 



17 S. inaequiradiata H. rr 



18 S. demissa (Con.) H. r 



19 Coelospira Camilla H. r 



20 Amphigenia elongata (Van.) H. rr 



21 Cypricardinia planulata (Con.) H. r 



22 Conocardiiun cuneus (Con.) 8. A. Miller c 



23 Phacops cristata H. r 



24 Dalmaiiites anchiops (Ghreen) H. r 



25 Ortboceras zeus H. (?) rr 



26 O. sp. c 



27 Gyrtoeeras cf. eugenium H. rr 



28 Zaphrentis sp. a 



External iraprossinn. 



29 Streptelasma sp. c 



External impression. 



Esopus shales 



Blackish, arenaceous shales with S p i r o p b 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 



A brownish black, crystalline sandstone which 

 weathers i<> a lighl brown porous sand-stone. In 

 the creek aboul a mile below the village tins rock 

 is n 1 most black and at the same distance north 



121-383 



1-262 



