112 



variegated beds succeed to these, becoming in places 

 compact limebanks entirely constituted of the debris of 

 fossils. 



These upper sandstones and sandy shales are remarkably 

 profuse in corals, some of the species being palpably 

 unlike those of the lower beds. The volcanic mass which 

 forms Black cape itself and against which these upper strata 

 abut presents a total sea face of 4,600 feet (1,400 m.) and 

 within it are two notable inclusions or separate masses of 

 Silurian strata. The first of these is in Macrae's cove, 

 600 feet (180 m.) from the beginning or base of the intru- 

 sive and the second at Lazy cove, | mile (0-5 km.) further 

 east. The intrusives are interbedded but the necessary 

 study of the fossils is yet wanting to determine whether 

 these fossiliferous masses are or are not additional parts 

 of the section. At Macrae's cove the thickness of the 

 sediments is 150 feet (45 m.) and in the narrower Lazy 

 cove they are 75 feet (23 m.). These coves may be reached 

 on foot along the beach by favouring tide. The volcanic 

 cliff ends \ mile beyond Lazy cove and at its termination 

 the red conglomerates of the Bonaventure formation lie 

 against it at an angle of 30 degrees. 



So far as at present indicated by the fossils, this section 

 from base to top is of the age of the Niagara (exclusive of 

 Clinton) or Rochester shale of the interior Silurian, 

 though the assemblage will doubtless show a preponderance 

 of Atlantic or European types which will bring it into more 

 proper comparison with the Gulf sections at Arisaig and on 

 Anticosti island. Its thickness is very great and in this 

 respect the section overpasses any Silurian section known 

 in America. 



BIBLIOGRAPHY. 



[Note. — The Black Cape section has only recently come 

 under close observation. It has now been studied in 

 some detail and the fauna assembled, but identifications 

 and classifications have yet to be made.] 



1. Logan, W. E. Geology of Canada, p. 447, 1863. 



2. Ells, R. W. Geological Survey of Canada, Rept. 



for 1883, E. p. 27, 1884. 



3. Clarke, John M. A Remarkable Siluric Section on the 



Bay of Chaleur. N.Y. State Mus. 

 Rept. Director for 191 1. p. 120-126. 

 1912. 



