Géologie . Ille, Wyo, Yellowstone Park, Wyo, New Castle, Wyo-S. D. 3 Voir Little Belt Mountain, fort Benton, Three Forks et Livingston folios, U.S. Geol. Surv. 4 Pour le Dakota du Sud, voir Darton, 21ème Ann. Rept. U. S. Geol. Surv., Pt, IV, et les folios suivants, U. S. Geol. Surv. : Oelrichs et Edgemont, S. D.-Neb. 5 outre les folios ci-dessus, U. S. Geol. Surv., voir aussi ce qui suit : ANTHRA-cite et Crested Butte, Ten Mile et Telluride. LA PÉRIODE JURASSIQUE. 65 la courroie marquée comme étant en terre sur la Fig. 346, apporte un soutien supplémentaire à la con-clusion qu'une barrière terrestre a séparée les eaux intérieures

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Geology . ille, Wyo., Yellowstone Park, Wyo., New Castle, Wyo.-S. D. 3 See Little Belt Mountain, Fort Benton, Three Forks and Livingston folios, U. S.Geol. Surv. 4 For South Dakota, see Darton, 21st Ann. Rept. U. S. Geol. Surv., Pt, IV, and thefollowing folios, U. S. Geol. Surv.: Oelrichs and Edgemont, S. D.-Neb. 5 In addition to the above folios, U. S. Geol. Surv., see also the following: Anthra-cite and Crested Butte, Ten Mile, and Telluride. THE JURASSIC PERIOD. 65 the belt marked as land in Fig. 346, lends further support to the con-clusion that a land barrier separated the interior waters from thoseof the Californian coast. The identity of many species from the UpperJurassic beds of the Queen Charlotte Islands and from the FrazerRiver in British Columbia, with those of the western interior, implyeither connection between these areas, or connection of both withsome point along the migratory routes which the marine life followed.Whether this connection was direct through British Columbia, or. Fig. 347.—A cliff of Jurassic rock, 1^ miles west of Bluff City, Utah.(Cross, U. S. Geol. Surv.) whether it was by way of Alaska, east of the Rockies, is unknown.The similarity of the Upper Jurassic marine fossils of America andof Russia, more fully set forth later, would be explained by eitherof these connections; so also would the fact that a few of the speciesof the California!! coast are identical with those of the Queen CharlotteIslands. Either connection would call for an extension of the Jurassicbeds of Montana, Dakota, Wyoming, etc., to the north or northwest.In spite of the fact that such extension has not been demonstrated, or> GEOLOGY. the most rational explanation Of the Marine Jurassic beds in question is that they were deposited in a greal dependence of the north Pacific or the Arctic Ocean, 1 which coveredthe area where the strata occur.If this be correct, it must be sup-posed that the northerly extensionof the marine Jurassic of the UnitedStates has been

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