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The trace fossil Arachnostega in the Ordovician of Estonia (Baltica)

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Authors:Vinn, Olev; Wilson, Mark A.; Zaton, Michal; Toom, Ursula
Author Affiliations:Primary:
University of Tartu, Department of Geology, Tartu, Estonia
Other:
College of Wooster, United States
University of Silesia, Poland
Tallinn University of Technology, Estonia
Volume Title:Palaeontologia Electronica
Source:Palaeontologia Electronica, 17(3). Publisher: Coquina Press, Calvert, TX, United States. ISSN: 1935-3952
Publication Date:2014
Note:In English with Spanish and French and German and Arabic summaries. 12 refs.; illus., incl. strat. col., sketch map
Summary:In the Ordovician of Baltica, burrows assigned to the ichnogenus Arachnostega Bertling, 1992 occur in steinkerns of bivalves, cephalopods, gastropods and hyolithids. Arachnostega abundance decreased significantly during the Ordovician in Baltica. It was most abundant in the Darriwilian (17% of gastropod steinkerns), slightly less abundant in the Sandbian (11% of gastropod steinkerns) and least abundant in the Katian (3% of gastropod steinkerns). This change in Arachnostega abundance correlates well with the regional climatic change (from temperate to tropics) during this interval, along with resulting changes in sedimentary environment, geochemistry and biota. Arachnostega was substrate selective and preferred bivalves over gastropods. Arachnostega occurs only in the Middle and Upper Ordovician of Estonia and is absent in the Lower Ordovician.
Subjects:Baltica; Biostratigraphy; Bivalvia; Burrows; Carbonate rocks; Cephalopoda; Climate change; Darriwilian; Gastropoda; Gondwana; Hyolithes; Ichnofossils; IGCP; Katian; Marine environment; Middle Ordovician; Mollusca; Ordovician; Paleoclimatology; Paleoecology; Paleozoic; Sandbian; Sedimentary rocks; Sedimentation; Substrates; Subtropical environment; Temperate environment; Upper Ordovician; Worms; Baltic region; Estonia; Europe; Aluvere Quarry; Arachnostega; Arachnostega gastrochaenae; Haljala Stage; Keila Stage; Kukruse Stage; Kunda Stage; Northern Estonia; Pirgu Stage; Steinkern; Uhaku Stage; Vormsi Stage
Coordinates:N584000 N590500 E0270000 E0223000
Record ID:722691-14
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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