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Details van artikel 9 van 18 gevonden artikelen
| Titel: |
Permian ammonoids from Eastern Australia |
| Auteur: |
Armstrong, J. D. Dear, J. F. Runnegar, B. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 14 (1967) nr. 1 pagina's 87-97 |
| Jaar: |
1967 |
| Inhoud: |
Two new species of Uraloceras, U. lobulatum, and U. whitehousei from the lower part of the Tiverton Formation at Homevale, northwest of Nebo, Queensland, have affinities with Artinskian and probably early Artinskian (Aktastinian) species from the type areas of the Lower Permian in the Ural Mountains, Russia. A possibly similar species, Uraloceras pokolbinense (Teichert), occurs in the Farley Formation in the Hunter Valley of New South Wales. The rich invertebrate fauna associated with the ammonoids at Homevale belongs to Fauna II of Dickins and it is now known that species of Neocrimites are associated with a similar fauna at Chatsworth, north of Gympie, and probably with the same fauna in the Lakes Creek Beds near Rockhampton. Neocrimites meridionalis Teichert & Fletcher from the lower part of the Branxton Sub-group in the Hunter Valley may also be of a similar age. Since Neocrimites has not been recorded from beneath the upper (Baigendzhinian) substage of the Artinskian, some of the rocks containing Fauna II in Queensland may be early Baigendzhinian in age and therefore slightly younger than has previously been thought. Alternatively the range of Neocrimites may extend into the Aktastinian and some evidence for the latter view may be provided by the obvious difference in whorl profile between N. meridionalis and other described species of Neocrimites. In either case the Aktastinian-Baigendzhinian boundary appears to lie at or near the top of the Tiverton Formation and equivalents in Queensland. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 9 van 18 gevonden artikelen
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