Isolated Chewtonian (Lower Ordovician) graptolites from western Newfoundland |
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Authors: | Jörg Maletz |
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Affiliation: | (1) Department of Geology, University at Buffalo, State University of New York (SUNY), 772 Natural Sciences and Mathematics Complex, 14260-3050 Buffalo, New York, U.S.A. |
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Abstract: | Isolated material of Chewtonian graptolites from the Cow Head Group of western Newfoundland shows some new and unexpected structural details. A high number of the two- and three-stipedPendeograptus fruticosus specimens show metasicular origin for th11 combined with a normal isograptid proximal development. Sigmagraptine sicular development includes a large parallel-sided prosicula and a parallel-sided metasicula. One species acquired an azygograptid-like proximal end, characterised by a loss of the initial branching, but kept the capacity to produce distal dichotomies.Maeandrograptus sinosus n. sp. andKeblograptus geminus n. sp. are described as new species. |
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Keywords: | Ordovician Chewtonian graptolites proximal development |
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