346 PALEOZOIC ROCKS OF THE HUDSOX BAY REGIOX 



the following pages are mostly new. They will be figured and described 

 in a paper now in preparation. 



Detailed Sectiox of Paleozoic Strata exposed aloxg Xelsox 



ElYER 



Silurian system 



Alexandrian series — about 2S feet 



Port Nelson limestone ^tn'^Sf ^ 



8. Dolomite, brown, in regular layers 4 to 10 inches thick. 



with few fossils : exposed about 4 miles below the 



Lower Limestone Rapids. The fossils listed below 



are from masses of this dolomite along the bank of 



the river some distance below the outcrop : 2S 



Zaijlirentis sp. 

 ^ Facosites sp. 

 Dinoljohis sp. 

 Stropheodonta sp. 

 Tirgiana decussata. 

 Pterinea occidentaUs. 

 Hormotoma sp. 

 Primitia munduhi rar. iucisa. 

 A gap in exposure 

 (Irdovician system 



Cincinnatian series 



Shammattawa limestone — about 47 feet 



7. Limestone, gray to yellowish brown, exposed in a low 

 arch about 8 miles below the Lower Limestone 

 Rapids: containing Strophomena sp.. Isotelu-s sp., 



and a few other fossils 7 



A gap in exposure ^ 

 6. Limestone, gray, in layers 4 to 14 inches thick, exposed in 

 an escarpment at the Lower Limestone Rapids, and con- 

 taining the fossils : 28 



Streptclasma sp. 

 Favosites near favosiis. 

 StropTiomeua cf. fluctuosa. 

 Sfropliomena sp. 

 RhifncJiotrema near capa-r. 

 Tctranota sp. 

 5. Limestone, gray, passing above into one or more layers of 

 yellowish brown dolomite : exposed one-half mile to one 

 mile above the Lower Limestone Rapids, and containing 



the fossils : 12 to 15 



Streptclasma sp. 

 Cohimnaria sp. 

 Favosites near favosus. 

 Plecta mbon ites seHceus. 

 Rafinesquina aff. altcnmta. 



