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Leaving no stone unturned: the feedback between increased biotic diversity and early diagenesis during the Ordovician

Wright, V. Paul and Cherns, Lesley 2016. Leaving no stone unturned: the feedback between increased biotic diversity and early diagenesis during the Ordovician. Journal of the Geological Society 173 (2) , pp. 241-244. 10.1144/jgs2015-043

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Abstract

Ordovician change in the nature of seafloor carbonates saw rapid decline of previously widespread flat pebble conglomerates and the Palaeozoic peak abundance of hardgrounds. The effective disappearance of flat pebble conglomerates, widely attributed to physical disruption of substrate by bioturbation, is reinterpreted as reflecting increased depth of carbonate precipitation below the Taphonomically Active Zone such that early lithified carbonates were less frequently reworked by scour. With deeper, more stable zones of cementation, exhumed limestones formed hardgrounds, whose mid-Ordovician acme supported rapid increase in epizoan diversity. Further deepening of cementation to below normal scour accompanied post-Ordovician decline in submarine hardgrounds.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Additional Information: First published online 23 December 2015 PDF uploaded in accordance with publisher's policies at http://www.sherpa.ac.uk/romeo/issn/0016-7649/ (accessed 24.3.16).
Publisher: Geological Society of London
ISSN: 0016-7649
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 26 October 2015
Last Modified: 13 May 2019 14:25
URI: http://orca.cf.ac.uk/id/eprint/88244

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