. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. " wAtcorrl INTRODUCTORY OBSfiRVAtlONS. 21 minima, Obolella prima, Palwacmea typica, CUmaeiichnitCft np. f and Ptychoparia minuta. Following tlio Handstoiic Hoiitli from Au Sublo Cba«m, it is seen outcroppiug all along tbo base of tbe mountains; at the Falls in the Hudson at Corinth, a good section is shown; in the town of Greenfield, Saratoga County, the calcareous layers begin to uppear r
. Second contribution to the studies on the Cambrian faunas of North America [microform]. Paleontology; Arthropoda, Fossil; Arthropoda, Fossil; Paléontologie; Arthropodes fossiles; Arthropodes fossiles. " wAtcorrl INTRODUCTORY OBSfiRVAtlONS. 21 minima, Obolella prima, Palwacmea typica, CUmaeiichnitCft np. f and Ptychoparia minuta. Following tlio Handstoiic Hoiitli from Au Sublo Cba«m, it is seen outcroppiug all along tbo base of tbe mountains; at the Falls in the Hudson at Corinth, a good section is shown; in the town of Greenfield, Saratoga County, the calcareous layers begin to uppear resting on the sandstone, and a little west of Saratoga Springs numerous fossils are found that correspond in character to the higher Potsdam sandstone faunas of Wisconsin; they are associated with others of a more distinctive type. The species now known are: Cryptozoa proliferuiu. BilliugBia Sarntoffouaia. Lingulepis acuminnta. Matthevia variabiliH. Platyceras ntinutiHsimam. Dioelloceplialna Hartti. Platyceras Hoyti. Dicellocephalus specioaus. Metoptoma comutiforme. Ptychoparia calcifera. Metoptoma simplex. Ptychoparia (A.) Baratogenais. § 27. This fauna was first noticed in a paper printed in advance of the Thirty-Second Annual Report of the New York State Museum of Natural History. It was there referred to the Calciferous horizon, January, 1^79. The fauna was referred to as Potsdam in 1883 (Amer. Jour. Sci., 3d ser., vol. xxvi, p. 439, footnote), and the reference to the Calciferous corrected in 1884 (Science, vol. iii, p. 136, February, 1884), and attention again called to the relations of the fauna to that of the PotHdam sandstone of Wisconsin, and a list of species given. Prof. Jules Marcou refers to the latter reference and uses the dala in Lis work on the "Taconic System and its position in Stratigraphic Geology" (Proc. Amer. Acad. Sci. and Arts, new ser., vol. xii, p. 222, 1885). § 28. The means of comparison now at hand show the Saratoga Pots- dam fauna t
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