12. PENN TOWNSHIP. F 2 . 291 



No. 6 also consists of a green shale with Lamellibranch 

 shells. 



No. 5 is a thin bed of limestone weathering to a soft rusty 

 mass and full of Brachiopods and Lamellibranchs, often in 

 a fair state of preservation, Sp. dlsjuncta very small. 



No. 4 is only a repetition of No. 5 in mineral composition, 

 being a limestone from which the water has partly removed 

 the lime, leaving a similar dark rusty mass. It contains 

 immense numbers of two species of Beyrichia, showing 

 white on the weathered stone, but difficult of detection in 

 the blue limestone core. 



No. 3 is a green, soft, sandy shale rubbly in texture and 

 containing numerous small nodules or concretions, which 

 from their appearance would be taken for phosphatic copro- 

 lites, but an examination by Mr. A. S. McCreath gave a 

 very small proportion of phosphoric acid. 



No. 2 is the Upper Fish bed, a thin layer on a surface of 

 red shales composed of the scales of Holoptychius f and 

 Bothriolepis. These two are probably one species of 

 Holoptychius. 



No. 1, about 2 feet below No. 2, consists of similar ma- 

 terial with the same remains. 



Two beds containing plants occur in the section. One 

 near the base of the section shows the usual "plant rags " 

 occurring in so many horizons in the Devonian here. 

 Another near the top of the section shows similar remains. 



The Kingsmill sandstone consists of a white or yellow- 

 ish sandstone perfectly honeycombed with casts of Lamelli- 

 branch shells, among which Schizodus rhombeus, Hall, is 

 the most abundant. It has accumulated here in immense 

 numbers, washed up on the beach or on a sand-bar in the 

 ancient ocean. They were evidently dead and drifted shells 

 for I have never seen two valves together or in their natural 

 position. 



The stony ridge, formed by the outcrop of the Kingsmill 

 sandstone wherever it occurs or can be traced in the county, 

 continues west and east from this point. It reappears on 

 Mr. G. Brunner's land also about a mile to the eastward, and 

 passes very near the head of the great loop on Sherman's 



