Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 572 CANADIAN EQUIVALENTS. [Ch. XXVII. because they contain certain species,-such, as Asaphus (Isotelus) gigas, Illcenus crassicauda and Orthoceras bilineatum, in common with, the overlying Trenton Limestone.* But, according to Prof. Hall, the Illcenus was erroneously identified, an error to which he confesses that he himself contributed; and on the whole these lower beds con- tain, he thinks, a very distinct set of
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 572 CANADIAN EQUIVALENTS. [Ch. XXVII. because they contain certain species,-such, as Asaphus (Isotelus) gigas, Illcenus crassicauda and Orthoceras bilineatum, in common with, the overlying Trenton Limestone.* But, according to Prof. Hall, the Illcenus was erroneously identified, an error to which he confesses that he himself contributed; and on the whole these lower beds con- tain, he thinks, a very distinct set of species, only 3 or 4 of them out of 83 passing upwards into the incumbent Be this as it may, the Black River Limestone, No. 15, contains certain forms of Orthoceras of enormous size (some of them 8 or 9 feet long!), of the subgenera Ormoceras and JSndoceras, seeming to represent the Lower Silurian or Orthoceras limestone of Sweden. Moreover, the general facies of the fauna of all these beds is essen- tially similar. Another ground for extending our comparison of the Llandeilo beds of Europe as far down as the calciferous sandstone is derived from the researches of Sir William Logan in Canada, and the study by Mr. Salter of the fossils collected by the Canadian surveyor near the end of the Ottawa River, where one mass of limestone Fossils from Allumette Rapids, River Ottawa, Canada, a Fig. 659.
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