Post-fossilization processes and their implications for understanding Ediacaran macrofossil assemblages

Matthews, Jack J. and Liu, Alexander G. and McIlroy, Duncan (2017) Post-fossilization processes and their implications for understanding Ediacaran macrofossil assemblages. In: Earth System Evolution and Early Life: a Celebration of the Work of Martin Brasier. Special publications, 448 (448). The Geological Society, London, SP448.20.

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Fossil assemblages from Newfoundland's Avalon Peninsula preserve diverse examples of the enigmatic Ediacaran macrobiota, offering some of the earliest evidence for large and complex multicellular life. These fossils are exposed on extensive coastal bedding planes in extraordinary abundances, permitting palaeoecological studies based on census data from spatially extensive palaeocommunities. Such studies have been used to constrain the reproductive strategy and phylogenetic placement of Ediacaran organisms. Geological mapping and stratigraphic correlation in the Mistaken Point Ecological Reserve reveal that some fossil-bearing surfaces can be tracked over distances of several kilometres. These laterally extensive surfaces reveal that the modern processes by which the sediment overlying a fossil surface is removed may impose important controls on the observed composition of fossil assemblages. Weathering and erosion – along with factors associated with tectonics, metamorphism and discovery – are here grouped as ‘post-fossilization processes’ and introduce biases that are often not explicitly accounted for in palaeoecological studies. Specifically, post-fossilization processes may differentially influence the preservational fidelity of individual specimens on a given surface and generate features that could be mistaken for original morphological characters. We therefore recommend that post-fossilization processes must be considered when undertaking palaeoecological studies in Ediacaran successions in Newfoundland and, potentially, elsewhere.

Item Type: Book Section
Uncontrolled Keywords: 2016AREP; IA71
Subjects: 04 - Palaeobiology
Divisions: 04 - Palaeobiology
07 - Gold Open Access
Journal or Publication Title: Geological Society, London, Special Publications
Volume: 448
Page Range: SP448.20
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 25 Apr 2017 21:27
Last Modified: 25 Apr 2017 21:27

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