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New Silurian cooksonias from dolostones of north-eastern North America

Edwards, Dianne, Banks, H. P., Ciurca, S. J. Jr. and Laub, R. S. 2004. New Silurian cooksonias from dolostones of north-eastern North America. Botanical Journal of the Linnean Society 146 (4) , pp. 399-413. 10.1111/j.1095-8339.2004.00332.x

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Abstract

New specimens of Cooksonia and Hostinella are described from the Bertie Group of Ontario and New York State, which is dated by faunas as latest Silurian (Přídolí). The rare plant fossils are unusual in that they are preserved in fine-grained, slightly argillaceous dolostones (‘waterlime’) rather than clastic rocks. At least two species of Cooksonia are present, one with ± globular sporangial morphology close to C. hemisphaerica Lang. Those with ellipsoidal/discoidal sporangia are compared with C. pertoni Lang, C. paranensis Gerrienne et al. and C. bohemica Schweitzer, the latter represented by a single specimen from the Přídolí of the Czech Republic. However, the paucity of specimens, which prevents assessment of taphonomic influences on shape, combined with the absence of any anatomical features and the gross morphological simplicity of the fossils, precludes specific assignment. Specimens of Hostinella include one in which apices and a lateral basal structure resembling a root are preserved. It is concluded that the Laurentian assemblage of Ontario and New York State is less diverse and disparate than coeval assemblages, which are also preserved in marine rocks. Its preservation in limestones may have been facilitated by the hypersalinity inferred from various sedimentary features, which would restrict the activity of many decomposers.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Q Science > QK Botany
Uncontrolled Keywords: eurypterids; graptolites; Hostinella; hypersalinity; Inocaulis; Přídolí
Publisher: Linnean Society of London
ISSN: 0024-4074
Last Modified: 04 Jun 2017 02:09
URI: http://orca.cf.ac.uk/id/eprint/10143

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