Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)

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URI: http://hdl.handle.net/2042/35594  |   DOI : https://doi.org/10.4267/2042/35594
Title: Early large borings in a hardground of Floian-Dapingian age (Early and Middle Ordovician) in northeastern Estonia (Baltica)
Author: VINN, Olev; WILSON, Mark A.
Abstract: Large plug- or slightly amphora-shaped borings have been found in the hardground marking the boundary between Early and Middle Ordovician rocks in northeastern Estonia. These borings cut large bioclasts of the trilobite Megistaspis and cannot be assigned with certainty to any known ichnotaxon. They indicate that the diversity of early borings may have been greater than was recognized previously.
Description: De grandes perforations cylindriques ou légèrement renflées, en forme d'amphore, ont été découvertes dans le fond durci qui sépare l'Ordovicien inférieur de l'Ordovicien moyen. Ces perforations recoupent de gros bioclastes dont des débris de trilobites (du genre Megistaspis). Elles ne peuvent être rattachées avec certitude à aucun ichnotaxon connu. Par conséquent la diversité des perforations primitives est certainement plus importante que ce qui était jusqu'à présent admis.
Subject: Bioerosion; Gastrochaenolites; hardground; Early Ordovician; Baltica; Bioérosion ; Gastrochaenolites ; fond durci ; Ordovicien inférieur ; Baltique
Publisher: Association "Carnets de Géologie"
Date: 2010

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