Paleontology of the Eureka DistrictU.S. Government Printing Office, 1884 - 298 pages |
Common terms and phrases
18 miles northwest angle apex Arethusina Atrypa beak Brachiopoda Cambrian Carboniferous Group cardinal characters Chonetes concentric striæ Conrad convex costæ Crepicephalus curved depressed Devonian limestone diameters Dicellocephalus Discina dorsal furrows dorsal valve east side elongate Eureka District Expl eyelobes fauna figs fixed cheeks Formation and localities.-Lower Formation and locality.-Lower Fortieth fossils front frontal limb Genus Geol glabella Hall Pal Hamilton Group hinge-line horizon Hyolithes Iowa left valve lines of growth Lingula locality.-Lower portion Lone Mountain Meek moderately convex muscular scars N. Y. State Cab narrow Nevada northwest of Eureka obliquely occurs Olenellus Orthis outer outline Plate plications Pogonip Pogonip Group posterior margin Productus Proetus Prospect Mountain Ptychoparia pygidium Rhynchonella ridge right valve Sanguinolites shale Silurian sinus siphuncle slightly small conical hill species specimens Spirifera Strophomena Surface marked Surv transverse Upper Helderberg ventral valve volution White Pine District Whitfield width York
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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.