Le genre Paraspirifer Wedekind, R., 1926 dans le Dévonien moyen de la partie orientale de l’Amerique du Nord
Godefroid, J; Fagerstrom, J.A. (1983). Le genre Paraspirifer Wedekind, R., 1926 dans le Dévonien moyen de la partie orientale de l’Amerique du Nord. Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 55(2): 61 pp., 7 figs, 15 pls.
In: Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. Aardwetenschappen = Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. KBIN: Brussel. ISSN 0374-6291, meer
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| Auteurs | | Top |
- Godefroid, J, meer
- Fagerstrom, J.A.
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| Abstract |
The authors describe seven species of the genus Paraspirifer WEDEKIND, R., 1926 on the basis of more than one hundred specimens from twenty-three localities in North America. Three of these species are new: P. conradi n. sp., P. halli n. sp. and P. clarkei n. sp. Two others are provisionally named P. cf. halli and P. sp. A. A Neotype is proposed for P. acuminatus (CONRAD, T.A., 1839) and the Lectotype of P. brownockeri (STEWART, G.A., 1927) is designated. The problems concerning the species Terebratula acuminatissima DE CASTELNAU, F., 1843 and Delthyris prora CONRAD, T.A., 1842 are briefly discussed. The genus Paraspirifer is confined to an area of ± 6.500.000 km2 in eastern North America. In New York, the biostratigraphic range-zone for the genus is from the upper Onondaga Limestone (Moorehouse Member) to the middle Marcellus Shale (Solsville Member) and, in Ohio and Ontario, from the upper part of the Columbus Limestone (Zones F — H) to the Silica Shale. In Indiana and Kentucky, the genus occurs in the upper Jeffersonville Limestone (P. acuminatus sensu lato Zone) and, in Illinois and Missouri, in the Grand Tower Limestone. |
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