Second Contribution to the Studies on the Cambrian Faunas of North AmericaU.S. Government Printing Office, 1886 - 369 páginas |
Otras ediciones - Ver todas
Términos y frases comunes
Acrotreta Agnostus Amer angles apex appears Archæocyathus Barrande Bathyuriscus beak Bic Harbor Billings Calciferous Cañon characters Collection U. S. National convex Crepicephalus Dicellocephalus dorsal valve elongate Emmons Ethmophyllum Eureka facial suture feet Formation and locality.-Middle fossils free cheeks front genal genera genus Geological Georgia Formation glabella groove head Highgate Springs Highland Range horizon Hyolithes interior Jour Kutorgina L'Anse au Loup lateral lobes length limestone Lingulella locality.-Middle Cambrian Lower Cambrian Lower Silurian Mesonacis Microdiscus Middle Cambrian narrow nearly Nevada Obolella occipital Olenellus Olenellus Gilberti Olenoides operculum Paradoxides Plate pleuræ posterior margin Potsdam Potsdam sandstone Ptychoparia pygidium quartzite rocks rounded S. W. Ford scars Scenella segments septa shales shell side slate slightly species spines Stenotheca strata striæ surface Taconic System thorax transverse trilobite Troy type specimen U. S. National Museum Upper Cambrian ventral valve Vermont Walcott width York