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Details van artikel 123 van 165 gevonden artikelen
| Titel: |
Revised correlations for Carboniferous marine invertebrate zones of eastern Australia |
| Auteur: |
Roberts, J. Jones, P. J. Jenkins, T. B. H. |
| Verschenen in: |
Alcheringa |
| Paginering: | Jaargang 17 (1993) nr. 4 pagina's 353-376 |
| Jaar: |
1993 |
| Inhoud: |
A review of the international significance of Carboniferous biostratigraphic units of eastern Australia, incorporating brachiopod, ammonoid, conodont and foraminiferal/algal evidence, is carried out in order that new ion microprobe ages can be used to calibrate the Australian units and to provide greater precision to the international geological timescale. The ages of brachiopod zones, which have been most used for regional correlation throughout eastern Australia, are revised using new conodont information from Jenkins et al. (1993), recent revisions of European ammonoid zones (Riley, 1990a, 1991), existing foraminiferal/algal data, and new internal evidence from brachiopods. Major changes include recognition that: the Tulcumbella tenuistriata Zone straddles the Devonian-Carboniferous boundary and extends into the mid-Hastarian (Tn1b-lowest Tn2b); the Schellwienella burlingtonensis Zone is late Hastarian to earliest Molinacian (Tn2c-Tn3c) in age; the Orthotetes australis Zone early Visean (Chadian to early Arundian; V1a-V1b) rather than late Visean in age based on new data from conodonts and reinterpretation of the ammonoid evidence; the Delepinea aspinosa Zone ranges in age from Arundian to early Holkerian (V1b to V2b), though the boundary with the succeeding Rhipidomella fortimuscula Zone cannot be well defined; the fortimuscula Zone is late Holkerian to Asbian (V3b), with the top of the zone being taken within the B2b ammonoid zone; and the Marginirugus barringtonensis Zone extends throughout the remainder of the Asbian and the Brigantian, to the end of the late Visean. Gondwanan assemblages succeeding the Early Carboniferous cosmopolitan faunas cannot be readily correlated with Northern Hemisphere biozones. The Levipustula levis Zone is Namurian in age at the base. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 123 van 165 gevonden artikelen
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