640 NORTH AMERICAN INDEX FOSSILS. 



SUPERFORMATION. 



Alleghany series. 

 Kanawha series (upper). 

 Homewood sandstone, 

 Mercer group. 

 Connoquenessing group. 



(Probable hiatus and dis conformity.) 



POTTSVILLE SERIES (upper). 



Sharon conglomerate. ' 



(Hiatus and dis conformity.) 



SUBFORMATION. 



upper Mississippic. 



In southwestern New York and northern Pennsylvania the 

 Mississippic-Carbonic succession is as follows: 



POTTSVILLAN ( Upper). 



Olean conglomerate. 



(Hiatus and dis conformity.) 



Mississippic. 



Oswayo group. 



Shenango shale. 



(Probable hiatus and dis conformity.) 



Shenango conglomerate. 



Oswayo shales. 

 Cattaraugus group (transitional). 



Killbuck conglomerate lentil. 



Salamanca conglomerate lentil. 

 Wolf Creek conglomerate. 



SUBFORMATION. 



Devonic — Chemung sandstone and Cuba conglomerate 

 lentil : 



The Alleghany series in the bituminous area, contains at intervals, 

 coal beds and limestones, the latter mostly marine. In ascending 

 order these beds are: (i) Brookville coal, (2) Clarion coal, 

 (3) Ferriferous (Vanport) limestone, (4) Buhrstone iron ore, 

 (5-6) Lower Kittanning sandstone and fire clay, (7-8) Lower and 



