30 PENNSYLVANIA AND NEW YORK DEVONIAN. [bull. 120. 
Fauna of No. 1476 E (from loose blocks in Hornbeck Creek, below Indian 
Ladder Falls). 
Strophoniena perplana (Con. ) Hall (rr) 
Chonetes coronata (Con.) Hall (?) (rr) 
Tropidoleptus carinatus (Con. ) Hall (rr) 
Rhynchonella cf. prolifica Hall (rr) 
Spirifera sp., cf. S. medialis Hall and S. grauulifera Hall (c) 
No. 1476 E2. — Farther up the creek, above all the high cascades and 
where only small ones exist, are blue, somewhat argillaceous shales of 
irregular cleavage, similar to the finely arenaceous shales of New York, 
in which fossils are common. 
Fauna of No. 1476 E2. 
Paheoneilo constricta (Con. ) Hall (a) 
Cypricardinia indonta (Con. ) Hall (rr) 
Macrodon hamiltoniae Hall (rr) 
Tellinopsis subemarginata (Con.) Hall (r) 
Orthonota undulata Con (rr) 
Modioinorpka mytiloides (Con.) Hall (rr) 
Nucula corbuliformis Hall (rr) 
Grammysia constricta Hall (rr) 
Spirifera rnucronata (Con.) Bill (rr) 
Amboccelia umbonata (Con. ) Hall (it) 
Pbacops rana (Green) Hall (it) 
Hyolitkesaclis Hall • (rr) 
No. 1476 HI. — Dingmans, Delaware Township, Pike County, Pa. 
First rapids in Dingmans Creek, just above the first house and an old 
mill after turning up the High Falls road, one-half mile from Ding- 
mans. The rock is a bluish, somewhat argillaceous shale, which closely 
resembles the New York undisturbed layers of similar shale. The dip 
is not great and the cleavage plaues, which in this region generally 
split the rocks at nearly right augles to the bedding and fossils, are not 
marked. Leiorhynchus multicosta Hall is the most common fossil, but 
there are species of the smaller lamellibranchs which correlate the 
exposure with the Hamilton. 
Fauna of No. 1476 HI. 
Leiorhynchus multicosta Hall (a) 
Nuculites triqueter Con (rr) 
Prothyris sp. ( ? ) (rr) 
Differs from any of the species figured by Prof. Hall. 
Modiella pygrnsea (Con. ) Hall (rr) 
Nucula lirata (Con. ) Hall (rr) 
Actinopteria subdecussata Hall (?) (rr) 
Goniatites sp (rr) 
No. 1476 H2.— The Silver Thread Falls, in a branch that enters 
Dingmans Creek from the east, have cut down through the thin Ham- 
ilton shales along the lines of joints. The line of jointing is 20° north 
of east and the dip is not great. Paracyclas lirata (Con.) Hall and 
Rhynchonella sp. were found at this locality. 
