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Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland

100%

Malinky J. M., Skovsted C. B.

Acta Palaeontologica Polonica

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2004

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tom 49

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nr 4

The hyolith assemblage from the Lower Cambrian Bastion Formation of North−East Greenland is significant in that it contains several hyolith taxa that possess traits of both orders Hyolithida and Orthothecida. They possess morphological traits that seem to be characteristic of the ancestral forms of both groups. In addition, many hyolith taxa from this interval are globally distributed, supporting the notion that these fossils have potential as stratigraphic indicators. This assemblage contains genera and/or species seen in Australia, North America, the Siberian Platform, and South China. Hyoliths identified include the hyolithids Parkula bounites, Hyptiotheca karraculum, Microcornus eximius, M. petilus, Paracornus poulseni gen. et sp. nov., as well as Similotheca similis?, S. bastionensis sp. nov., and S. groenlandica sp. nov.; two opercula remain in open nomenclature. Orthothecids from this assemblage are one unnamed species each of Contitheca and Gracilitheca. Large, macro−sized hyoliths from the same formation described by Poulsen (1932) are mostly unidentifiable, although an operculum formerly identified as Hyolithes (Orthotheca) communis is reassigned to Hyptiotheca. Problematic organisms of uncertain affinity include Cupitheca holocyclata, Conotheca australiensis, an unnamed species of Coleolus, and the cap−shaped Cassitella baculata gen. et sp. nov. that may be an operculum of some as yet unknown organism. Missarzhevsky (1969) used Hyolithes(Orthotheca) bayonet var. groelandicus and H. (O.) bayonet var. longus as the basis for Lenatheca, but the specimens on which that genus is based are too poorly known for a proper diagnosis of Lenatheca.

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Small shelly fossils from the argillaceous facies of the Lower Cambrian Forteau Formation of Western Newfoundland

70%

Skovsted C. B., Peel J. S.

Acta Palaeontologica Polonica

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2007

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tom 52

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nr 4

A diverse fauna of helcionelloid molluscs, hyoliths, and other small shelly fossils is described from limestone layers within the Forteau Formation of the Bonne Bay region in western Newfoundland. The fauna is dominated by internal moulds of various molluscs and tubular problematica, but also includes hyolith opercula, echinoderm ossicles, and other calcareous small shelly fossils preserved by phosphatisation. Originally organophosphatic shells are comparatively rare, but are represented by brachiopods, hyolithelminths, and tommotiids. The fauna is similar to other late Early Cambrian faunas from slope and outer shelf settings along the eastern margin of Laurentia and may be of middle Dyeran age. The similarity of these faunas indicates that at least by the late Early Cambrian, a distinctive and laterally continuous outer shelf fauna had evolved. The Forteau Formation also shares elements with faunas from other Early Cambrian provinces, strengthening ties between Laurentia and Australia, China, and Europe during the late Early Cambrian. Two new taxa of problematic fossil organisms are described, the conical Clavitella curvata gen. et sp. nov. and the wedge−shaped Sphenopteron boomerang gen. et sp. nov.

3

Early Cambrian molluscs from glacial erratics of King George Island, West Antarctica

61%

Wrona R.

Polish Polar Research

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2003

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tom 24

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nr 3-4

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Polish Polar Research

2 Skovsted C. B.

1 Malinky J. M.

1 Peel J. S.

1 Wrona R.

1 2007

1 2004

1 2003

Hyoliths and small shelly fossils from the Lower Cambrian of North-East Greenland

Small shelly fossils from the argillaceous facies of the Lower Cambrian Forteau Formation of Western Newfoundland

Early Cambrian molluscs from glacial erratics of King George Island, West Antarctica