Rhyn. 906 



numerous in Middle and Northern Pennsylvania, in Bedford 

 Co. none appear near the Lower {Allegrippus) Gonglomerate^ 

 but a layer 100 feet beneath contains them, with other brachi- 

 pod shells. (T2, 79, 2i0.) In Huntingdon Co., on Coffee run. 

 White reports that one single specimen of a Bhynchonella was 

 the only form that could be distinctly made out of the many frag- 

 ments of shells in the Chemung upper {LacJcawaxen) conglom- 

 erate. (T3, 93. ) This may be the Third Oil Sand of the North- 

 west, the Panama conglomerate of New York, and the Leloeuf 

 conglomerate of Erie Co., in which Carll reports an abundance 

 of Rhynchonellas (III, 70), especially at Carrott's quarry (III, 

 67); and also in the overlying shales (III, 71). R, sappho 

 is found under the Panama conglomerate in N. Y., and Rhyn- 

 chonellas are found 200 feet beneath it in Erie Co. (bed 15, 

 Falls run section, Q4, 250.) In Perry Co., in the King^s mill 

 sandstone Claypole^s spec. 11,991, 12,695 were found. In Tioga 

 and Bradford Cos., the upper Chemung hsis many. (See Spec. 

 2232.) In McKean Co., R. duplicata (Spec. 881-2,-3). Vlllg, 



Rhynchonellas in the Oil Sand group^ which may corres- 

 pond to the Passage beds { VIII-IX) of middle and eastern 

 Pennsylvania, are numerous. See CarlFs specimens 3393, 3401, 

 3403, from McKean Co. In Huntingdon Co., with Spiriferas^ 

 Patterson section (bed No. 5,' red sandstone, 500 feet above 

 Chemung upper conglomerate (T3, 183), and in the iron ore hed 

 of Clear ridge and Smith's valley, 250 feet ditto (T3, 102). In 

 Lycoming Co., Logan station. Hay's iron ore (Spec. 893-2,-4, 

 fragments) and Sellard's iron ore (Spec. 901-2,-3). Compare 

 R, eximia^ Spec. 884-1,-2,-6 ; and from Bradford Co., Spec. 

 886-5. To this horizon probably belong the Rhynchonellas 

 occasionally seen by Stevenson in the fucoidal beds 1, and 3, 

 of his Youghiogheny river section (K3, 104). In the First Oil 

 sand at the top of the group, called in Warren Co. the Hosmer 

 run conglomerate^ well preserved specimens can be found (III, 

 250). /X 



Rhynchonellas and Avicidopectens occur together in the 

 Bedford shale {CatsMlD formation^ OYQxlying the Oil Sand 

 group. (Spec. 3318, 3320). Nelson farm, Venango Co. /X 



Rhynchonellas are exceptionally abundant in the Pocono 

 formation, about its middle, in the bottom 30 feet of the Shoup^s 

 run Mack shales Broad Top, Huntingdon Co., 800' to 830' be 



