Report of the State Geologist. 271 



stone is five feet, pnDcipally of coarse arenaceous shales, but with more 

 argillaceous shales on top. 



Fauna of No. 500, A^. 



RhynchoneUa Sappho^ Hall. 



Rhyncfionella congregata^ Con. (?). 



Chonetes coronata, Conrad. 



Lingula ligea^ Hall (?). 



Orhiculoidea grandis, Yan. (?). 



Spirifer medkdis, Hall. 



Spirifer mucronatus, Hall. 



Modiomorpha comp>laMata, Hall. 



Grammy sia htsulcata, Con. (?). 



Goniophora hamiltonensis, Hall. 



Cim,itaria recurva^ Conrad. 



Tentaculites atteniiatus^ Hall. 



Orthoceras constrictum,^ Con. (?). 



Crinoid stems. 



Southeast of 500 A^ and 200' hio-her on the hillside is an 

 exposure of 10' of coarse, arenaceous shales. Fauna of 500 A^. 



Spirifer onedialis, Hall. 



RhynchoneUa co7itracta, Hall (?). 



Rhynchonellci Sappho, Hall (?). 



Crinoid stems. 



500 C. — Gorton Lake, three and one-half miles from Brookfield, 

 occupies a depression near the top of the high hills in that part of the 

 township. At a short distance from the lake, in the outlet is a cascade 

 giving an exposure of eighty feet, consisting mostly of soft, dark argil- 

 laceous shales. In the bed of the creek, C^, just above the falls, is a 

 stratum rich in fossils, both as to number of specimens and species. 

 Spirifer mucronatus, Conrad, is very common; Niicleospira concinna. 

 Hall, quite abundant with nicely preserved specimens; and Paracyclas 

 lirata, Conrad, also quite common. In a stratum of the thin black 

 shales, C^, about half way down the ravine the following species 

 occur : 



Spirifer mucronatus, Conrad, very common. 



Amhoccelia umbonata, Conrad. *" 



Niicleospira concinna, Hall, abundant. 



Orhiculoidea Doria, Hall. 



Orthoceras subulatum., Hall, more common than in any other locality 

 of this region. 



Phacops rana, Green, several good specimens. 



