348 THE CARBOXIFEKOUS SYSTEM. 



appears, I found Productus semireticulatus, with other shells, also 

 occurring in the East River ; and Productus cora^ a shell not yet met 

 with in the East River limestones, but very characteristic of the 

 gypsiferous formation in other parts of the province. Below this 

 limestone there is another break, also showing traces of sandstones 

 and a bed of gypsum, and then a thick bed of dark limestone, partly 

 laminated and partly brecciated, without fossils, and containing in its 

 fissures thin plates of copper-ore. Beneath this limestone is a great 

 thickness of reddish conglomerate, composed of pebbles of igneous 

 and metamorphic rocks, and varying in texture from a very coarse 

 conglomerate to a coarse-grained sandstone. In one place it contains 

 a few beds of dark sandstones and shales. These are succeeded by 

 red, gray, and dark sandstone and dark shales, in a disturbed condition, 

 but probably underlying the conglomerate. They contain a few fossil 

 plants, especially a Lepidodendron which appears to be identical with 

 the species already mentioned as found in a similar geological position 

 at Horton and Noel. The limestones, with their characteristic fossils, 

 may be seen still farther west on the West River of Antigonish. 



Dr Honeyman has recently discovered the pygidlum of a PhilUpsia 

 in these limestones, being the second instance of the occurrence of 

 Trilobites in the Lower Carboniferous of Nova Scotia. He has also, in 

 the Transactions of the Nova Scotia Institute, published an interesting 

 paper on the Geology of Antigonish County, in which he more accu- 

 rately than heretofore defines the limits of the formation. I have 

 availed myself of this paper in correcting the geological map in this 

 edition. 



On the west side of the Ohio River, about fifteen miles from Anti- 

 gonish, this Carboniferous district terminates against the metamorphic 

 hills, which here occupy a wide surface, and send off a long branch to 

 Cape Porcupine in the Strait of Canseau. This branch consists in great 

 part of slates older than the Carboniferous system, but it also appears 

 to contain altered Carboniferous rocks. It bounds this district on the 

 south. Along its northern side, the Lower Carboniferous limestones 

 and gypsum appear at the north end of Lochaber Lake, at the South 

 River, and at the northern end of the Strait of Canseau. They 

 are probably continuous, or nearly so, between these points. In the 

 coast between the place last mentioned and Antigonish, Carboniferous 

 rocks, principally sandstones, appear in several places ; and towards 

 Pomket and Tracadie, in the central part of the district, the Coal for- 

 mation, probably its lower portion, is seen ; and small seams of coal 

 have been found in it. I have had no opportunity of examining them, 

 but have no doubt that they form the southern edge of the coal-field 



