The Canadian journal of industry, science and art . division of the groupas subdivided by the New York geologists, or of the equivalents oftheir Water-lime Group or Tentaculite Limestone. With us, inWestern Canada, it might be called the Bertie or Cayuga dolomite,as its only known exposures are in those townships ; or a still betterterm would be the Eurypterus formation, so named from its principaland characteristic fossil: the Eurypterus remipes, a low form of thecrustacean class, figured in woodcut 227- In the above townships itsstrata consist of thin-bedded greyish dolomites, interstratifie
The Canadian journal of industry, science and art . division of the groupas subdivided by the New York geologists, or of the equivalents oftheir Water-lime Group or Tentaculite Limestone. With us, inWestern Canada, it might be called the Bertie or Cayuga dolomite,as its only known exposures are in those townships ; or a still betterterm would be the Eurypterus formation, so named from its principaland characteristic fossil: the Eurypterus remipes, a low form of thecrustacean class, figured in woodcut 227- In the above townships itsstrata consist of thin-bedded greyish dolomites, interstratified towardsthe base with a few brownish shales, and with a brecciated bedcomposed chiefly of dolomite fragments. At St. Helens Island and Round Island, opposite Montreal, onIsle Bizard, and at one or two neighbouring localities, some outlying * The gypsxxm, as quarried, sells at about §2 the ton. When erround for manure, the costper ton is about $ ; and when calcined for plaster, about fifteen or sixteen dollars, 440 A POPULAR EXPOSITION OF THE. Fig. remipes (reduced). or small isolated patches of conglo-meritic rock, referred to the Lower Hel-derberg division, have been recognisedof late years. Their existence was firstpointed out by Dr. Dawson. They aremade up of fragments of various rocks,gneiss, Trenton limestone, Utica shale,syenite, &c., cemented together by apaste of greyish dolomite. These con-glomerates are regarded as patches ofstrata once continuous with the LowerHelderberg series of eastern New York,their removal in intervening areas havingbeen effected by denudation. The lime-stones and shales which at Cape Gaspe,and elsewhere in that region, rest un-conformably on the dark shales of theCalciferous or Quebec formation, are likewise referred by Sir William Logan to the Lower Helderberggroup. These beds are, at present, known provisionally as the Upper Gaspe Limestones—the lower limestones of the Gaspeseries, already alluded to as occurring on th
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