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An agrichnial feeding strategy for deep-marine Paleogene Ophiomorpha group trace fossils

John Paul Cummings and David M. Hodgson
An agrichnial feeding strategy for deep-marine Paleogene Ophiomorpha group trace fossils
Palaios (April 2011) 26 (4): 212-224

Abstract

Ophiomorpha group trace fossils occur abundantly in a range of Eocene-aged deep-marine environments of deposition in the Basque basin, northern Spain. The morphology and dimensions of these trace fossils, observed in off-axis submarine lobe deposits, are discussed. The reported specimens display a highly organized and systematic burrowing behavior preserved on turbidite bed bases that display interconnecting Y-shaped (hexagonal-polygonal) morphologies. This observation, together with the cross-cutting relationship with tool marks, suggests construction of postdepositional agrichnial burrow networks. The networks probably harvested microbes that broke down cellulose-based organic matter providing an exploitable nutrient source for crustacean trace makers of Ophiomorpha. Therefore, the Ophiomorpha group-related traces discussed herein are postulated to represent an ethological response to changes in deep marine environmental conditions driven by global climate change during the early Paleogene, including the early Eocene hyperthermal events.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 26
Serial Issue: 4
Title: An agrichnial feeding strategy for deep-marine Paleogene Ophiomorpha group trace fossils
Affiliation: University of Liverpool, School of Environmental Sciences, Liverpool, United Kingdom
Pages: 212-224
Published: 201104
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 80
Accession Number: 2011-050378
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., 1 table, geol. sketch map
N43°17'60" - N43°17'60", W02°15'00" - W02°15'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201128
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