53 



A TRY. 



Atrypa aspera ( Terebratula aspera). Hall, Report, W. D. 



\J\\l cj^rn^ Vine. _^s^ ^^^^' v^g^ 



yiti^^'^^m^ ,......=5^ 200, fig. 80, 1, 



la, 15,2, Rog- 

 ers, page 828, 



fig. 671, nil 



G. Hamilton 

 f^jf form at ion. 

 ''(Compare 

 Schlotheim's 

 fig. of 1813, 

 in Petrifac- 

 turkunde) — 

 CI ay pol e , 

 Perry Co., Pa. 

 Report F 2, 



preface, VIII c. Hamilton formation. In eastern Pennsylvania, 

 Monroe Co., MarshalPs falls, reported by H. D. Rogers. By I. 

 C.White as A. spinosa^ in various places, especially near Strouds- 

 burg, S. of McMichael's or on Gap road, in Corniferous limestone. 

 Villa, (G6, p. 120.) From Tioga Co., Pa. C. E. Hall's list of 

 collections, in Chemung strata, VIII g. (Proc. A. P. S. Jan. 5, 

 1876.) Perry Co., Pa., by Claypole, in Hamilton sandstone, 

 VIII G ( Preface to F2, p. xiii. Also 000, catalogue of collections, 

 14 specimens from five localities.) Huntingdon Co., by White, 

 Haun's bridge, Juniata township, 100' and 300' beneath Che- 

 mung Upper conglomerate. (T3, pp. 98, 194.) Bedford Co., by 

 Stevenson, in Portage sandstone, VIII /*, Yellow creek, 1000' be- 

 neath Chemung lower conglomerate, (T2, p. 80) ; brown SS, 

 Calvin's, Napier t., (p. 117) yellow SS. W^. Borden's ridge, St. 

 Clair t. (p. 122) ; reddish brown flags (p. 122) ; Chemung SS. 

 Clear ridge, Zembower's, W. Providence t. (p. 216)— F///. 

 Specimen 855-29 (a very coarse specimen of A, aspera? in 

 good condition); — 30 (similar, but lower half broken off); 

 in Sherwood's Coll. in Sullivan t., Tioga county, Pa , (O, p. 

 236), from Zipper Chemung VIII g, 



Atrypa aspera, var. occidentalis, Hall, Geological Report 

 on Iowa, Vol. 1, part 2, 1858. Hamilton formation^ VIII g. 

 This is the varietv seen in the Norih- western States. 



