Atky. 60 



pp. 120,122,134,247; 0. E. Hall, collections, 1875.) In the 

 Susquehanna counties, described in Report G7, it is found 

 in the Clinton lower shales; upper shales; and iron ore; 

 Va, (pp. 341; 231,252; 113,341; in the Lower Helderberg 

 Stromatopora bed (p. 348), and from the Bastard limestone 

 upward in Maurer's, Derr's, Russells, Mensch's, Lime ridge 

 quarries, on both sides of Montour's ridge (pp. 89,97,101, 

 24^,218,261,272,311,313) ; in the Hamilton shales and sand- 

 stone, Fishing creek, Catawissa, etc., (pp. 75,229,289); in 

 Tully limestone ( VIII d) on Little Fishing creek; Catawissa ; 

 S. Danville, etc., (pp. 75,207,^^89,339,352); in the Stony 

 brook beds of Chemung ( F///,(7 ; p. 72.) In Perry and Juniata 

 counties itis found in VI, Vlllb, VIII c, VIII g. (See Clay- 

 pole's Rt. F2, preface pp. xiii, xiv; also 000, Catalogue of col- 

 lections ; 60 specimens from 23 collecting places. ) In Hun- 

 tingdon Co., Pa., it tirst appears in the 133' of shale overlying 

 the Clinton fossil ore at Orbisonia (T3, p. 136,141); and 

 then a little higher, in the lime slate 320', the cherty lime- 

 stone 300', and most numerous of all, in the coral bed, 260' be- 

 neath the top of Lower Helderberg, formation VI\ on the 

 Weaver's run, Hopewell township, (T3, pp. 156, 157.) Then 

 a little higher in the crinoid bed, 130', the flint bed 90', and the 

 coral bed 30' below the top of F7, in Powell's quarry, Cove 

 Station, (T3, p. 123.) Also in the Bastard limestone part of 

 VL on Coffee run, (T3, p. 172.) Much higher it occurs in 

 Hamilton upper sandstone, VIII c^ on Shoup's run, Penn town- 

 ship, (T3, pp. 179, 184.) Still higher, in Tully limestone VIII 

 d. No. 21 of Patterson section (T3, p. 181.) Still higher and 

 only 275' beneath the Chemung top conglomerate, VIII g^ at 

 Haun's bridge, (T3, p. 98.) In Bedford Co., Pa., it abounds in 

 Mann's quarry, Monroe township. Lower Helderberg, VI, (T2, 

 p. 187) and in Martin's ridge, near Maryland line, (p. 158.) 

 Also in Portage sandstone VIII /, 1000' beneath Chemung 

 lower conglomerate, on Yellow creek, (T2, p. 80.) Also in 

 brownish Chemung sandstone, VIII g^ in Napier and St. 

 Clair tt., (T2, pp. 117, 120, 122.) In Centre Co., it is found in 

 Lower Helderberg, VI, Marcellus F/// 5, and Chemung VIII 

 g (T4, 430, 433, 434.) In Lycoming, in Clinton upper lime 

 shales, V «, (T, 43.) From Bradford Co., N. of Leroy, speci- 

 mens of it (with Strophodonta cayuta) are in the Claypolecol- 



