vssy 



walcott.J SUMMARY NEWFOUNDLAND. 257 



This is not sufficient in the absence of Upper Cambrian fossils to estab- 

 lish the presence of the Potsdam horizon on the southwestern side of 

 the island. It is quite probable that strata of Cambrian age occur, but 

 as yet the proof of their presence is very defective. 



EASTERN AND SOUTHEASTERN NEWFOUNDLAND. 



The section at Canada Bay is as follows, according to Dr. Alexander 

 Murray i 1 



Feet. 



A. Clouds Mountain bluish gray slates, conglomerates, and diorite 2,500 



13. Salt Water Pond bluish gray, black, blue, reddish, and white limestones, 

 yellowish gray and black slates, and gray and white sandstones, in some 



parts holding OJenellus vermontanus, Liugnla, Scolithus and fucoids 2,000 



C. Light and dark blue limestones and brown slates, with cherty limestone at 



the top 900 



5,400 



The strata referred to the Cambrian system in southeastern New- 

 foundland are well exposed on the peninsula of Avalon and westward 

 along the coast to the northern shore of Fortune Bay, and northward, on 

 the western shores of Trinity Bay. Dr. Murray has given a general 

 description of the terrane in the reports of the Geological Survey of 

 Newfoundland for 1868 and 1870 ; and a fine geological map of the 

 Peninsula of Avalon, by Dr. Murray and Mr. James P. Howley, 1881, 

 shows the distribution of the Cambrian rocks. The correlated section 

 is described as superjacent to pre-Cambrian " Huronian " rocks and as 

 having a thickness of nearly 6,000 feet, of which 138 feet are lime- 

 stone and the remaining portion argillaceous aud arenaceous deposits. 



The section in descending order is as follows : 2 



Feet. 



(«) Brown and black micaceous shales, with gray micaceous sandstones of Bell 

 Island, Conception Bay. Organic contents are : two species of Lingula, 

 four species of Palasopbycus, Eophyton linnceanum (Torrell), and another 

 Eophy ton, Cruziana semiplicata (Salter) and some others 476 



(r) Red and green sandstones and slates, with some calcareous beds at the base. 



Estimated thickness 1,426 



(q) Kelly's Island sandstones and shales. A few fucoids were the only fossils 



observed in this division 720 



(p) Black slate or shale. At Fortune Harbor this division was found to contain 



Paradoxides bennettii 150 



(o) A bed of dark gray limestone. Fossils consist of broken fragments of 



trilobites and shells, amonej which latter a Lingula was observed 5 



(») Red, green, and black slates, or shales, which occasionally pass into a finely 

 laminated argillaceous shale, as at Topsail Head. The fossils are Para- 

 doxides bennettii, Conocephalites gregarius, and probably some other species 

 not yet recognized 1,045 



'Sequence and distribution of the rocks of the great Northern Peninsula. Geol. Survey New 

 founilland, Report of progress for 1864. Revised edition, London, 1881, p. 15. 



2 Murray, Alexander : Of Primordial Silurian and Related formations. Rep. Gool. Surv. Newfound- 

 land for 1870, St. Juhn's, 1871, pp. 30-39. Geologv of Newfoundland, 1881, London, pp. 237-239. 



Bull. 81 17 



