. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 677 Plat. Platyceras retrorsum, Hall. Pal. N. Y. Vol 3,1869,p. 320,. Hall. Fa/. Vo/, ///. /STS^. //. SST. ^ pl 58, fig. 10a, upper part of spire, shell worn smooth and partly gone; 5, profile showing elevated apex; (?, young, im- perfect. Found in shaley limestone of the Lower Helderherg. VI. (Among the specimens are some so difi'erent that Hall established as a variety P, abnorme.) Dr. Barrett has collected it on the Delaware river below Port Jervis, f
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 677 Plat. Platyceras retrorsum, Hall. Pal. N. Y. Vol 3,1869,p. 320,. Hall. Fa/. Vo/, ///. /STS^. //. SST. ^ pl 58, fig. 10a, upper part of spire, shell worn smooth and partly gone; 5, profile showing elevated apex; (?, young, im- perfect. Found in shaley limestone of the Lower Helderherg. VI. (Among the specimens are some so difi'erent that Hall established as a variety P, abnorme.) Dr. Barrett has collected it on the Delaware river below Port Jervis, from I. C. White's Stormville shales above and Stormville limestone beneath the Stormville conglomerate of Pike and Monroe counties. G6, pp. 132,131.—77. Platyceras spinigerum, Worthen, Geo. Sur. 111. Vol. 5, i^c. 1873, page 594, plate 28, figs. 4«, side view of the shell, show- ing the spine bases; ^5, view of the opposite side of the shell; JfC^ profile view, show- ing the aperture. Distin- guished from all other Coal measure species by groove (sinus) like long depressions and the spines on its surface. Brighton, 111., roof shale of Coal No. 6. XIII? Platyceras spirale, Hall, Pal. N. Y. Vol. 3,1859, page 334, plate 63, fig. 4, a young one yet without plications; ba^ 5, a larger one, with some strong plications; 6, plications partially developed, or only shown by waves of the striae; 7, one smooth in front and plicated a little behind; 8, larger and strongly plicated; 95, back of another, a little compressed. Found in the slaty beds of the New York Lcuer Helderlerg. VI — In Pennsylvania recognized by Claypole at various outcrops of the Lower HpMerherg chert h^df^^ just under the Oriskany^ in. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lesley, J. P. (J. Peter), 1819-1903; Pennsylvania. Board of Comm
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
