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Ediacaran fossils from the Innerelv Member (late Proterozoic) of the Tanafjorden area, northeastern Finnmark

Published online by Cambridge University Press:  01 May 2009

J. Farmer ,
G. Vidal ,
M. Moczydłowska ,
H. Strauss ,
P. Ahlberg  and
A. Siedlecka
J. Farmer
Affiliation:
Department of Earth and Space Sciences, University of California, Los Angeles, 405 Hilgard Avenue, Los Angeles, CA 90024, U.S.A.
G. Vidal
Affiliation:
Institute of Palaeontology, University of Uppsala, Box 558, S-751 22, Uppsala, Sweden
M. Moczydłowska
Affiliation:
Institute of Palaeontology, University of Uppsala, Box 558, S-751 22, Uppsala, Sweden
H. Strauss
Affiliation:
Institut für Geologie, Ruhr-Universität Bochum, Postfach 102148, D-4630 Bochum 1, Germany
P. Ahlberg
Affiliation:
Department of Historical Geology and Palaeontology, Lund University, Sölvegatan 13, S-223 62, Lund, Sweden
A. Siedlecka
Affiliation:
Norges Geologiske Undersøkelse, P.O. Box 3006, N-7001 Trondheim, Norway
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Abstract

An Ediacaran assemblage dominated by an unidentified species of CyclomedusaSprigg 1947, along with species of Ediacaria?Sprigg 1947, BeltanellaSprigg 1947, HiemaloraFedonkin 1982, and Nimbia?Fedonkin 1980, is described for the first time from the Innerelv Member of the Stappogiedde Formation exposed in coastal outcrops west of Tanafjorden on Digermul Peninsula, in northeastern Finnmark, northern Norway. The fossil assemblage is dominated by discoidal forms which share certain affinities with the cosmopolitan genera. Cyclomedusaand Ediacaria. However, our specimens differ from these and other discoidal Ediacaran fossils in the absence of radial sculpture. This, along with a basically concentric organization, are characteristics shared with Kullingiafrom the Dividal Group of northern Scandinavia, the White Sea, Podolia, and northwestern Canada, along with undescribed discoidal remains from the Charnian Supergroup, Charnwood Forest, Leicestershire, England, and the Conception Group, Avalon Peninsula, Newfoundland.

Our discovery of an Ediacaran-type assemblage within the Middle Innerelv Member provides support for previous suggestions of a late Vendian age for this sequence. This general conclusion is consistent with the occurrence of early Cambrian taxa, including the trace fossil Phycodes, and the problematical forms Vendotaenia and Sabellidites, in basal portions of the Lower Breivik Formation, within the same stratigraphie section. The lowest formally-proposed faunal zone in northern Scandinavia is the Kullingia Zone, based on the occurrence of the fossil medusoid Kullingia concentrica in Member III (Middle Sandstone C) of the Dividal Group, northern Scandinavia. Kullingiais a distinctly chambered form that was probably pelagic. In contrast, Cyclomedusa,and related genera of the so-called Cyclomedusaplexus, comprise an informal grouping of intergrading, probably benthic, taxa that possess radial and/or concentric organization. In light of the intergradational nature of taxa, present difficulties in taxonomic interpretation and correlation, and the abundance of cyclomedusoids in many Ediacaran assemblages, we suggest that the concept of the Kullingia Zone, as originally defined for northern Scandanavia, be broadened to include the common form genera of the Cyclomedusa plexus, inclusive of the occurrences in the Innerelv Member described herein. It is our hope that additional fieldwork will provide a basis for more refined taxonomic evaluations and biozonation.

Type
Articles
Information
Geological Magazine , Volume 129 , Issue 2 , March 1992 , pp. 181 - 195
Copyright
Copyright © Cambridge University Press 1992

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