The Canadian journal of industry, science and art . Fig. 2\3,—Pentamerm oblongus and Internal east. MINERALS AND GEOLOGY OF CANADA. 211 the Niagara beds proper. Thus defined, the formation consists at itslower part of about twenty feet of dark-grey limestone (in part dolo-mitic, and in which the well-known Pentamerus oblongus, fig. 213,first appears), followed by a considerable thickness of dark, more orless bituminous, thin-bedded limestones or calcareous shales, which intheir turn are overlaid by dark, thick-bedded limestones, also of abituminous character. These relations are shewn in the s
The Canadian journal of industry, science and art . Fig. 2\3,—Pentamerm oblongus and Internal east. MINERALS AND GEOLOGY OF CANADA. 211 the Niagara beds proper. Thus defined, the formation consists at itslower part of about twenty feet of dark-grey limestone (in part dolo-mitic, and in which the well-known Pentamerus oblongus, fig. 213,first appears), followed by a considerable thickness of dark, more orless bituminous, thin-bedded limestones or calcareous shales, which intheir turn are overlaid by dark, thick-bedded limestones, also of abituminous character. These relations are shewn in the sections,fig. 210: beds A, 5, and 6. At the Falls of Niagara, the calcareousshales make up a thickness of about 80 feet, and the thick-beddedstrata which succeed, and over which the cataract breaks, exhibitabout the same amount; but in adjoining localities it attains a thick-ness of 165 feet. Thin bands of gypsum occur in both the shalesand limestones; and the latter contain, in various places, small cavi-ties and fissures filled with crystals of
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