Macrofossils of the Wenlockian Slite Siltstone of Gotland
作者:
ClaesF. Bergman,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 1
页码: 13-25
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009448585
出版商: Taylor & Francis Group
关键词: Brachiopoda;Gastropoda;Nautiloidea;Bivalvia;Bryozoa;Crinoidea;Tabulata;Trilobita;Echinodermata;Graptolithina;algae;ichnofossils;faunal list;palaeoecology;preferred;orientation;shallow-water environment;new locality;Slite;Siltstone;Slite Beds;Wenlockian;we
数据来源: Taylor
摘要:
The Slite Siltstone, the uppermost unit in the Wenlockian Slite Beds of Gotland, Sweden, is fairly unfossiliferous as a whole, but the silty beds are intercalated with a few calcareous beds which contain a diverse and abundant fauna. The brachiopodsStrophochonetes cingulatus and Plagiorhyncha cordataare the characteristic fossils of the siltstone. The preferred orientation of high-spired gastropods (Holopellasp.) and orthoconic nautiloids, recorded at two localities, was probably caused by sediment-sliding. DisarticulatedCypricardiniaspecimens occur in convex-up position and thus indicate a turbulent environment. An assemblage ofStrophochonetes cingulatushas been found in life position, which shows that a rapid burial and a less turbulent environment are probable. The oriented fossils and the faunal composition show that the siltstone was deposited in a shallow marine environment, below the normal wave-base in the central area. In the north-cast and south-west of the siltstone extension, a shallower water depth seems probable. Large-scale transport of sediment was frequent. The presence of‘Atrypa’ dormitzerifrom the locality Svarvare 1 suggests a relation with assemblages from Scania and Bohemia. The siltstone fauna does not correlate with any depth-related assemblage from Wales or the Welsh borderland.
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