. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. â M' â. 82 CAMBRIAN FAUNAS OP NORTH AMERICA. [BULL. 30. shale and limestone \n from 100 to 200 feet in tbickness aud carries nu- merous fraf^mentH of fossils, among which we have determined six spe- cies, viz: Kutorgina ProspeetenHis, Scenelta conula, Olenoides quadriceps, OlenelluH Gilberti, 0. Iddingsi, Anomocareparvum,fi,rn\Ptych<ypariaBii. 1 § 54. The Prospect Mountain limestone is pra
. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. â M' â. 82 CAMBRIAN FAUNAS OP NORTH AMERICA. [BULL. 30. shale and limestone \n from 100 to 200 feet in tbickness aud carries nu- merous fraf^mentH of fossils, among which we have determined six spe- cies, viz: Kutorgina ProspeetenHis, Scenelta conula, Olenoides quadriceps, OlenelluH Gilberti, 0. Iddingsi, Anomocareparvum,fi,rn\Ptych<ypariaBii. 1 § 54. The Prospect Mountain limestone is practically a continuation of the limestone of the upper portion of No. 1, aud 500 feet up in it we find, in a baud of shale, Scenella conula, Agnoatits interatrictv^t 1, Olenoides quadriceps, Ptychoparia Prospectensia. All but the last are closely related to species from ihe Georgia horizon, in either Vermont or Canada. One other species, Stenotheca elongata, which is found as- sociated with Olenellua Thompaoni, Protypua aenectus, &c., at L'Anse an Lonp, is found 2,000 feet higher up in the limestone. Another species, Olenoides apinoaus, is found in association with species characteristic of a lower horizon than the typical Potsdam of Eureka, at Pioche, Nevada. § 55. Within a short distance of the summit of the limestone (-) we foupd a fauna that is more readily referred to the Upper Cambrian or Potsdam horizon, although Stenotheca elongata, Protypua aenectus, and Olenoidea apinoaus are elsewhere found in the Middle Cambrian. This fauna includes representatives of both the Georgia and the Potsdam faunas, and is, in a measure, the passage fauna between them. The species are: Obolella (liko O. pretiosa). Lingula nianticulu, KntoFf^ina Whitlielrti. Orthis Eurekensis. Stenotheca eluugata. AguoHtus communis. Agnoatns bidona. AgnoHtus Neon. Protypus senectus. Protypus expansus. Dicellncephalns ? nasutns. Ptycboi)aiia Oweni. Ptychoparia Hagiiei. Ptychoparia occidentalis. Pt
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