CAPE BKETOIf ISLAND, NOVA SCOTIA. 519 



are greatly folded and repeated by faults. They are distinguished 

 by numerous beds of conglomerate, and of fine and coarse grits,, 

 plainly derived from the Pre- Cambrian strata. At numerous points 

 are found beds filled with species of Lingula, Trilobites (Agnostus and 

 Olenus), Orthis, Obolella, &c., comparable with the fossils of the 

 Lower Potsdam of the province of Quebec. At several points there 

 are beds containing nodules of phosphate of lime, resolvable under 

 the microscope into a bituminous paste holding siliceous matter and 

 fragments of Lingulce &c.,- — coprolites, presumably of some of the 

 larger species of Trilobites. Mr. Pletcher further draws attention 

 to the general similarity of these measures to the primordial rocks 

 of Kewfoundland, and to those found by Mr. Kichardson on the 

 Strait of Belleisle. The following abstract of the section of these- 

 rocks, as exposed on Long Island, will show their general character 

 in St. Andrew's Channel : — 



1. Greenish-grey, coarse, calcareous conglomerate, containing red syenite, 



felsites, and quartzites of many colours, interstratified with coarse, 

 micaceous, haematitic sandstones, and blue, purple, and red felsites. 



2. Bluish, slaty felsite, with much calcspar and haematite. 



3. Greenish, calcareous, pebbly and shaly sandstones. 



4. Dark blue, greenish, and red felsites, with pebbles and veins of calcspar. 



5. Sea-green and bluish conglomerates, with pebbles of felsite, calcspar, 



quartzite, and argillite. 



6. Bluish felsite, with much calcspar. 



7. Bluish limestone. 



8. Red conglomerate. 



9. Bluish hmestone, felsite, and contorted argillite, with veins of hgematite 



and calcspar. 



10. Bluish quartzose grit, passing into a red conglomerate, 



11. Limestone and felsite alternating in thin beds. 



12. Bluish-grey felspathic sandstone. 



13. Alternations of felsite, limestone, quartzite, and argillite. 



14. Indian red sandy marl, with calcareous sandstone. 



15. Bluish felsite, with beds of limestone and quartzite. 



In the Mira Eiver district, on the Sydney road, are met greenish, 

 purple and reddish, soft, felspathic, micaceous, arenaceous shales and 

 sandstones, quartzite, grit, and conglomerate, with pebbles of lime- 

 stone and greenish argillite. On Kelvin's Brook are conglomerates 

 containing pebbles of the Pre- Cambrian Measures, succeeded by 

 purple, grey, and red quartzose and felspathic sandstone and grit, 

 and by Indian red argiUites ; and on Salmon Eiver are beds of 

 whitish sandstone, with impressions of Obolella, &c., with red sand- 

 stone, marl, conglomerate, <S:c. It may be remarked that these 

 measures are, as a rule, free from the eruptive rocks which charac- 

 terize the succeeding formation at many points. 



Devonian. 



These measures occupy an irregular tract, extending from Loch 

 Lomond to St. Peters, and reappear in Isle Madame. They are met 

 with again in that part of Guysboro Co., in Nova Scotia proper, lying 

 between Chebucto Bay and the Strait of Canso, and, recrossing the 

 Strait, extend irregularly from Plaster Cove towards the head waters 



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