期刊
REVIEW OF PALAEOBOTANY AND PALYNOLOGY
卷 173, 期 -, 页码 46-56出版社
ELSEVIER
DOI: 10.1016/j.revpalbo.2011.10.010
关键词
phytoplankton; Teratology; Ordovician-Silurian boundary; Hirnantian; Laurentia
资金
- Lille 1 University
- Laboratoire Geosystemes
- German Research Foundation (DFG) [Mu 2352/1]
- Schmauser-Stiftung (Erlangen, Germany)
A detailed study of Late Ordovician-early Silurian acritarchs (Palaeozoic phytoplankton) from Anticosti Island (Quebec, Canada) revealed an unusually high abundance of abnormal forms from the upper Hirnantian carbonate strata (uppermost Ordovician) of the Ellis Bay Formation in the western part of the island (member 6, Spinachitina taugourdeaui chitinozoan Biozone). The objective of this paper is to describe these abnormal forms in detail. Two species are particularly affected: Disparifusa psakadoria Loeblich and Tappan, 1978 presents abnormally hypertrophied central vesicles, whereas Peteinosphaeridium laframboisepointense nov. sp. has appendices that are fused along their length. The abnormal forms of acritarchs occur in rocks deposited during periods that are near time-equivalents to those of maximum ice-sheet extensions on Gondwana during the Hirnantian glaciation. Although this stratigraphic level corresponds to an interval of strong perturbations of the global carbon cycle, the exact factors causing the observed malformations remain unknown. (C) 2011 Published by Elsevier B.V.
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