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Endolithic micro-organisms silicification of a bivalve fauna from the Silurian of Gotland
Authors:Louis Liljedahl
Institution:Department of Historical Geology Palaeontology. Sölvegatan 13, S-223 62 Lund, Sweden
Abstract:The silicified Wenlockian bivalve shells at Möllbos have been fragmented to a considerable extent. Shells which were broken prior to silicification exhibit possible original shell layers while those which were fragmented during laboratory treatment show no primary structures. The fauna at Möllbos was attacked by endolithic micro-organisms. The borings of these were then coated with a carbonate envelope. After burial the unattacked original shell material was dissolved the envelope silicified. Later, empty moulds were subsequently filled with drusy calcite occasionally with quartz crystals. A third silicification went occurred at a later diagenetic stage when matrix had become lithified.
Keywords:Bio-erosion und preservation  endolithic borings  boring fungi  boring algae (cyanobacteria)  silicification  bivalves  Silurian  Gotland  Sweden
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