. Bulletins of American paleontology. American Lituitidae (Cephalopoda) 147. Text-figure 1. Ranges of the families of the Tarphyceratida in terms of the American section, on the left, and the Swedish and Baltic sections combined on the right. Family names are largely abbreviated by elimination of the -atidae endings. Symbols on the left are L (G), Lower Canadian, Gasconadian; D, Demingian; J, Jeffersonian ; C, Cassinian; A-P indicates the Ashby-Porter- field intervals; I consider the Eden a shaly phase of limestone beds of the late Trenton. On the right, the Tarphyceratidae are largely confine
. Bulletins of American paleontology. American Lituitidae (Cephalopoda) 147. Text-figure 1. Ranges of the families of the Tarphyceratida in terms of the American section, on the left, and the Swedish and Baltic sections combined on the right. Family names are largely abbreviated by elimination of the -atidae endings. Symbols on the left are L (G), Lower Canadian, Gasconadian; D, Demingian; J, Jeffersonian ; C, Cassinian; A-P indicates the Ashby-Porter- field intervals; I consider the Eden a shaly phase of limestone beds of the late Trenton. On the right, the Tarphyceratidae are largely confined to the Kunda, with a few doubtful records from higher beds. The Trocholitidae are nearly as old in Norway. The acme of the Lituitidae is in the Kunda-Lasnamagi interval, de- clining in the Uhaku, and persisting higher only as Tyrioceras. The range of the Barrandeoceratida is represented in terms of the first appearances in North America; the order is yet unknown in the Baltic region until Apsidoceras and Cliaractoceras of the Apsidoceratidae (not represented) appear in the Upper 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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