212 N. H. Darton — Upper Silurian rocks of 



1. Sandstones, conglomerates and shales, interbedded.. 20 meters. 



2. Arenaceous limestones thickly bedded and much 



fissured diagonally 7 « 



3. Less impure more thinly bedded limestones. Upper 



members holding Water-lime fossils 5 " 



4. Very fossiliferous, heavily bedded limestones hold- 



ing Pentamerus and Delthyris shaly fossils 5 " 



These beds are very nearly vertical and strike N.N.E. ; 

 they graduate into each other almost imperceptibly ; and 2 and 

 3 are considerably altered, holding in fissures and along bed- 

 ding planes veins of quartz and iron oxides. In the upper 

 members of 3, several remains of Leperditia alia were found. 

 They were somewhat scattered and only fairly well preserved ; 

 detailed search in this and the adjacent beds failed to discover 

 more. In a bed a few decimeters above, a mass of Favosites 

 Helderbergia H. was found, and near by a Zaphrentis Romeri H. T 

 in a very poor state of preservation, but 40 mm. long by 30 in 

 diameter. 



In beds 4 the following species and individuals were found. 



*Astylospongia inornata H., many specimens ; Fenestella, two 

 forms ; * Chcetetes Helderbergia H., 1 specimen ; *Favosites Helder- 

 bergia H. and other Favosites sp. ? ; Cladopora sp. ? ; ^Zaphrentis 

 Romeri H., 2 ; * Streptelasma stricta H. 15 mm. long, 3 ; Fistuli- 

 pora sp. ? ; Crinoidal remains ; Orthis oblata H., 3 ; * Orthts per- 

 elegans H., 4; Streptorhynchus Woolworthana H., 2; *Stropho- 

 mena rhomboidalis Wahl., 23 ; *Spirifer cyclopterus H., 9 ; *Spiri- 

 ferina perlamellosus H., 13 ; Cyrtina JDalmayiiH., 1 ; * Niicleospira 

 ventricosa H., 1 ; Rhynchonella pyramidata H., 2 ; R. formosa 

 H. ; *R. transversa H., 1 ; Meristella sp. ? ; *Atrypa reticxdaris 

 Linn., 84 ; * Pentamerus galeatus Dal., 1 76 ; *JPlatyceras Gebhardi 

 H., 1 ; P. platystomum H., 1. The names asterisked are of species 

 occurring as complete individuals or impressions ; and the others^ 

 of those found only in fragmentary valves, casts or impressions. 



Although occurring at every point here, the Pentamerus 

 galeatus is especially abundant in the more western bed exposed, 

 where its water-worn valves literally fill some of the layers. 



In their continuation southward, these strata are obscured by 

 the drift which reaches quite to the summit on this part of the 

 west side of the hill. But in a small quarry a few dozen meters 

 south of the cross road, a fine exposure is found (at 5 on the 

 map). The Water Lime rocks are exposed for a thickness of 

 about a meter and the sandstone outcrops a few meters to the 

 east. On one of the limestone layers remains of Leperditia alta* 

 occur in abundance associated with fragments of Spirifera 

 Vanuxemi H.,* and indeterminable corals and crinoids; immedi- 

 ately overlying are beds holding the following remains : 

 * Also noted by Dwight. 



