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Product: 021 Devonian ammonoids from the Appalachians and their bearing on international zonation and correlation.


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Product - 021 Devonian ammonoids from the Appalachians and their bearing on international zonation and correlation. Image
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Special Papers in Palaeontology: 21
<br />1978.
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<br />Devonian ammonoids from the Appalachians and their bearing on international zonation and correlation.
<br />M R House
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<br />70 pp., 10 pls.
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<br />ABSTRACT. New ammonoid records from eastern North America are described as part ofa sequence ofthirty successive faunas recognized especially in the Middle and Upper Devonian. Most of these assemblages occur in the New York succession, but those occurring elsewhere are integrated with that succession as far as evidence allows. Critical ammonoid sequences in North Africa and Europe are described for the pre-Famennian Devonian. This enables comments to be made on the correlation of the America faunas.
<br />Anarcestes is described from New York. From the pre-Tioga Bentonite Onondaga Limestone equivalents in Virginia and West Virginia, two goniatite faunas are distinguished, an earlier with abundant agoniatitids, including Agonia/i/es oliveri sp. nov., and a later fauna with Foordites buttsi. From near Salem, Virginia, a rich barytized fauna is described with Cobrieroceras plebeiforme, Agoniati/es, and Holzapfeloceras croyi sp. novo which is thought to correlate with the Werneroceras Bed of New York, and with the Cabrieroceras-bearing levels of Morocco, Algeria, the Montagne Noire, Czechoslovakia, and the Rhenish Schi~fergebirge which, in those areas, is usually taken to mark the basal Givetian. Higher Givetian faunas in the Appalachians include levels with Maenioceras, Sobolewia, and tomoceratids. From West Virginia are described Koeneni/es lamellosus kirchgasseri subsp. nov., Lob%rnoceras hassoni sp. nov., Epi/ornoceras, and ?Pharciceras from borizons thought to be equivalent to pre-Genundewa strata in New York. This fauna is thought to correlate with European early Frasnian horizons. Faunas at approximately the Genundewa level including Probeloceras and Manticoceras are recognized in West Virginia. A fauna with Platyclymenia, Cyr/oclymenia, and Sporodoceras is reported from Lorain County, Ohio, and a higher level with Cymoclymenia is described from the same area. These comprise the first records of clymenids from eastern North America.
<br />A Middle Devonian silicified fauna with Cabrieroceras is described from Nevada and compared with the eastern Middle Devonian faunas. A specimen of Tornoceras is described which is the first Devonian goniatite recorded from Bolivia.