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Recent benthic Ostracoda from Hornsund, south Spitsbergen, Svalbard Archipelago

100%

Mackiewicz A.

Polish Polar Research

2006

tom 27

nr 1

71-90

This paper includes a check-list of Recent Svalbard marine ostracods based on published sources and on diploma theses as well as some new studies. This is the first study of this group of crustaceans from Hornsund. A total of 41 species belonging to 12 families were collected at 55 sampling stations from dredged sediments. Seven species are reported for the first time from the Svalbard Archipelago. Polycope orbicularis Sars is the most abundant species in the present fauna. Species compositions of Hornsund and the Liefde- fjorden are seen to have the highest similarity (S = 50.6).

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Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia

84%

Evdokimova I. O.

Acta Palaeontologica Polonica

2006

tom 51

nr 4

773-778

Pronounced changes in benthic ostracod associations in the north−west part of the East European Platform, across the Early–Middle Frasnian (Devonian) transition, track a marine transgression event. More than 80 ostracod species belonging to the Eifelian Mega−Assemblage were recorded. Cavellinidae and Acratiidae generally dominate the Early Frasnian Sargaevo Horizon. Middle Frasnian ostracod associations of the Semiluki Horizon are more diverse and are characterised by different dominant both geographically and stratigraphically, resulting from significant palaeo−basin bottom relief and benthic biotope differentiation. The ostracod associations are indicative of very shallow, well oxygenated semi−restricted epeiric environment, with occasional marine influence, alternating with short periods of open shelf conditions. The relative abundance of ostracod species in the different associations, and faunal diversity indices, show considerable variations throughout the Early–Middle Frasnian, and suggest a less restricted position within an intra−platform setting in the Middle Frasnian, relative to a more restricted ostracod habitat in the Early Frasnian. The succession of Early–Middle Frasnian micro−benthic associations within the Main Devonian Field seems to be of a regional scale, and resulted from a marine regression−transgression couplet, corresponding to eustatic cycles IIb–IIc. This was paired with synsedimentary tectonic subsidence in adjacent areas of the north−east East European Platform, progressively improving marine water circulation in the extremely shallow−water shelf seas.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Polish Polar Research

1 Evdokimova I. O.

1 Mackiewicz A.

2 2006

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Recent benthic Ostracoda from Hornsund, south Spitsbergen, Svalbard Archipelago

Benthic ostracods from the Early-Middle Frasnian transition in the north-western East European Platform, Russia