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The impact of anoxia on pelagic macrofauna during the Toarcian Oceanic Anoxic Event (Early Jurassic)

Caswell, Bryony A. and Coe, Angela L. (2014). The impact of anoxia on pelagic macrofauna during the Toarcian Oceanic Anoxic Event (Early Jurassic). Proceedings of the Geologists' Association, 125(4) pp. 383–391.

DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.pgeola.2014.06.001
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Abstract

Extreme environmental change during the Toarcian Oceanic Anoxic Event had widespread impacts on marine biota. This study provides new evidence, from the Yorkshire coast sections, UK, that the event was associated with periods of elevated fish and ammonite mortality. Using a synthesis of pelagic macrofaunal changes, benthic macrofaunal data and geochemical proxies we show that there are stratigraphical correlations between: (1) pelagic macrofaunal ranges and abundance, (2) benthic macrofaunal abundance, and (3) geochemical proxies that indicate deoxygenation. We identify eight stratigraphical intervals of differing character. Results suggest two major phases of relatively persistent deoxygenation with photic zone euxinia. The cyclostratigraphic timescale indicates that each phase lasted at least tens of thousands of years. Belemnite migration during the event probably resulted from increased seawater temperatures and low food supply similar to that observed for many marine taxa, including squid, within the present-day oceans.

Item Type: Journal Item
Copyright Holders: 2014 The Geologists' Association
ISSN: 0016-7878
Project Funding Details:
Funded Project NameProject IDFunding Body
PhD StudentshipNot SetNERC (Natural Environmental Research Studentship
Keywords: oceanic anoxic event; environmental change; belemnites; ammonites; biogeographic range shift; fish mortality
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 52806
Depositing User: Angela Coe
Date Deposited: 08 Jan 2018 10:31
Last Modified: 02 May 2018 14:37
URI: http://oro.open.ac.uk/id/eprint/52806
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