348 PALEOZOIC ROCKS or THE HUDSON BAY EEGIOX 



Thickness 

 in feet 

 Streptelasma sp. 



Ealysites gracilis. 



Hall/sites sp. 



StropJiomeyw sp. 



Hormotoma icinnipe pen-sis. 



Maclunn<i cf. manito'beiuie. 



Machiriyia sp. 



En4oceras cf. annulatum. 



Endoceras cf. proleiforme. 



Cf. Bumastus sp. 

 A gap in exposure 



1. Dolomite, gray to brown, sandy, grading below into a cal- 

 careous sandstone, in rather even layers; exr.»osed about 

 10 miles above the Upper Limestone Rapids : containing 

 the fossils : 14 to IS 



Receptaculites oiceni. 



Hormotoma winnipegenHs. 



MacJurina sp. 



CORRELATIOX OF XELSOX RIVER LIMEsTOXE 



The fauna and lithoiogr of the Xelson Eiver limestone exposed along 

 Xelson Eiver are remarkably similar to those of the rocks of late Trenton 

 age in the Lake Winnipeg region. The more common species of fossils 

 occurring in this limestone in the Xelson Eiver region are listed below. 

 The species in this list which have a cross in front of the name also occur 

 in the Trenton limestone in the Lake Wionipeg region. 



List of the more common Fossils from the Xelson River Limeston-e 



— Receptaculites oiceni. 



— Cnlapefcid cf. canadensis. 

 + Colli mnaria calacina. 



— Columnaria (Paleophiilh.i.m'\ stokesi. 



— E'lJii sites gracilis. 



— Dalmanella testudinaria var. 



— Hormotoma icinnipegensis. 



— Maclurina manitohense. 



— Trochonema cf. umljilicatum. 



— Ci/j-toceras manitohen^se. 

 4- Potetioceras cf. nohile. 



The species listed above are thought to indicate the Trenton (Galena 

 of upper Mississippi Valley) age of the strata from which they came. 

 Williams' has described limestones of Middle Ordovician aee in the 



' M. Y. WiUiams : The Ordovician rocks of Lake Timiskaming. Geol. Surrey of Can- 

 ada, Mus. Bull. no. 17. Geological series, no. 27. .Tune 7, 1915. 



