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allied angle anterior appear associated base beak beds broad Cañon cardinal cast characters closely collection concentric conical convex curved depressed described Devonian Devonian limestone diameters differs distinct dorsal valve elongate enlarged Eureka District examples Expl extending figs fixed cheeks Formation Formation and locality.Lower Fortieth fossils front frontal furrows Genus Geol Geological glabella Group Hall head height Hill horizon illustrated interior known lateral left valve length less limb limestone lobe locality Lone Mountain Lower margin Meek narrow Natural nearly Nevada northwest of Eureka obliquely occurs outer outline Peak Plate Pogonip portion posterior radiating range referred represented ridge rounded scar shale shell short showing shown side slightly slope species specimens Spirifera striæ strong strongly surface Surface marked Surv transverse unknown Upper ventral valve volution White Pine width York
Page 4 - ... a sparse fragmentary fauna which closely resembles in general character the fauna of the similar upper Devonian black shales of the eastern continental area. In these western sections there is a remarkable difference in the range and habit of species. " Some species," as Mr. CD Walcott has shown, "have reversed their relative position in the group as they have been known heretofore, and others have a greater vertical range.