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Calcareous smaller foraminifers from the Lower Permian Council Grove Group near Hooster, Kansas
Groves, J.R.; Boardman II, D.R. (1999). Calcareous smaller foraminifers from the Lower Permian Council Grove Group near Hooster, Kansas. J. Foramin. Res. 29(3): 243-262
In: Journal of Foraminiferal Research. Cushman Foundation for Foraminiferal Research: Washington. ISSN 0096-1191; e-ISSN 1943-264X
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| Auteurs | | Top |
- Groves, J.R.
- Boardman II, D.R.
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| Abstract |
The classic work of Erich Spandel (1901) on Early Permian foraminifers from Hooser, Kansas is revised here on the basis of new collections. The stratigraphic interval exposed at Hooser is assigned to a portion of the Council Grove Group that spans the Asselian-Sakmarian stadial boundary within the Cisuralian Series. Preliminary analysis of the Hooser fauna demonstrates little congruence between foraminiferal biofacies and fourth-order depositional sequences independently defined on both sedimentologic and conodont abundance criteria. The lack of congruence is probably attributable to coarse and lithologically biased sampling for foraminifers. Nevertheless, diverse foraminiferal faunas correspond generally to shallow, normal marine depositional phases and impoverished faunas to restricted marine phases. Among the taxa first described from Hooser, only Geinitzina postcarbonica Spandel retains its original nomenclatural designation. The taxonomic status of Monogenerina Spandel has been unclear historically, and it remains so because we are unable to relate the type illustrations to anything recovered from the new samples. Specimens identified by Spandel as Bigenerina cf. eximia Eichwald and Textularia gibbosa d'Orbigny (sensu Brady) are probably referrable to the Palaeotextulariidae. Ammodiscus concavus Spandel is reassigned to Brunsiella as B. concava (Spandel). We follow previous authors in elevating Tetrataxis conica Ehrenberg var. lata Spandel to Tetrataxis lata Spandel, and in referring Nodosaria postcarbonica Spandel to Nodosinelloides. The genus Tezaquina Vachard was described originally as pseudoseptate. Re-examination of the type species, T. clivuli Vachard, confirms that it lacks septa but possesses internal wall thickenings that crudely partition the test. Primitively septate forms previously identified as Tezaquina are referred to Vervilleina n. gen., anchored by the type species Dentalina bradyi Spandel from the Hooser locality. The presence of septation delimits the Syzraniidae from the Geinitzinidae, both of which are classified here within the Lagenina. According to this interpretation, the Lagenina are probably a monophyletic group that originated in Moscovian time, and then diversified throughout the remaining Late Paleozoic before their major radiation in the Early Mesozoic. |
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