The Early Cambrian Fauna of North-East Greenland

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The Early Cambrian Fauna of North-East Greenland

Skovsted, Christian B., 1974- (författare): Uppsala universitet,Institutionen för geovetenskaper

Peel, John S. (preses)

Holmer, Lars E. (preses)

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Geyer, Gerd, Professor (opponent): Institut für Paläontologie, Universität Würtzburg, Würtzburg

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ISBN 9150617311
Uppsala : Institutionen för geovetenskaper, 2003
Engelska 22 s.

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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)

Abstract Ämnesord

Stäng

Small shelly fossils are common in sediments of Early Cambrian age and include the earliest common representatives of metazoan animals with mineralized hard parts. The group includes fossils of very different morphology, composition and ultrastructure. They seem to represent skeletal remains of numerous animal groups, the biological affinities of which are largely unresolved. However, the wide geographic range of many forms has the potential to enhance biostratigraphic and palaeogeographic resolution in the Early Cambrian. The late Early Cambrian sequence of North-East Greenland has yielded an assemblage of more than 88 species of small shelly fossils, brachiopods and trilobites, indicative of a middle Dyeran age (Botoman equivalent). The recovered fossils include a number of species that are known from other Early Cambrian palaeocontinents, and particularly strong ties to late Early Cambrian faunas of Australia are documented. The many cosmopolitan taxa thus identified suggests a close juxtaposition of palaeocontinents at this time. The systematic affinity of many of these small shelly fossils is poorly understood, partly because of their fragmentary nature and poor preservation. However, new data from North-East Greenland improves our understanding of the function and biological affinity of certain taxa. Collections of the problematic fossil Mongolitubulus from North and North-East Greenland exhibit characters indicative of a defensive function as spines of bivalved arthropods, while species of the problematic genus Triplicatella represent the opercula of an unknown tubular shell, probably related to orthothecid hyoliths. The bivalved fossil Mickwitzia from North-East Greenland combines characters of linguliform brachiopods and sclerites of Micrina, a non-bivalved problematic form (halkieriid) from Australia. The combination suggests that Mickwitzia is a stem group brachiopod and strengthens arguments for a halkieriid ancestry of the brachiopod phylum.

Ämnesord

NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

Earth sciences
Early Cambrian
Dyeran
Botoman
Biostratigraphy
Palaeogeography
Small Shelly Fossils
Brachiopoda
Mollusca
Hyolitha
Trilobita
Geovetenskap
Earth sciences
Geovetenskap

Publikations- och innehållstyp

vet (ämneskategori)
dok (ämneskategori)

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Av författaren/redakt...: Skovsted, Christ ...; Peel, John S.; Holmer, Lars E.; Geyer, Gerd, Pro ...

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