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Article: Ichnology and palaeobiology of Phoebichnus trochoides from the Middle Jurassic of north‐east England

Papers in Palaeontology - Cover Image - Volume 2 Part 1
Publication: Palaeontology
Volume: 2
Part: 1
Publication Date: Febuary 2016
Page(s): 139 154
Author(s): Jillian N. Evans, and Duncan McIlroy
DOI: 10.1002/spp2.1035
Addition Information

How to Cite

EVANS, J.N., MCILROY, D. 2016. Ichnology and palaeobiology of Phoebichnus trochoides from the Middle Jurassic of north‐east England. Papers in Palaeontology, 2, 1, 139-154. DOI: 10.1002/spp2.1035

Author Information

  • Jillian N. Evans - Memorial University of Newfoundland Department of Earth Sciences St. John's Newfoundland Canada (Email: jne223@mun.ca)
  • Duncan McIlroy - Memorial University of Newfoundland Department of Earth Sciences St. John's Newfoundland Canada (Email: dmcilroy@mun.ca)

Publication History

  • Issue published online: 13 February 2016
  • Article first published online: 01 January 1970
  • Manuscript Accepted: 02 October 2015
  • Manuscript Received: 22 July 2015

Funded By

NSERC Discovery Grant
Canada Research Chair
NSERC Alexander Graham Bell Canada Graduate Scholarship
SEPM Foundation Student Research

Online Version Hosted By

Wiley Online Library
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Abstract

Phoebichnus trochoides is a large, radiating trace fossil most commonly found in shallow marine siliciclastic deposits. The structure consists of a central boss from which extend numerous, lined, radiating burrows which have an active fill. Serial grinding and modelling techniques allow the full three‐dimensional morphology of Phoebichnus trochoides to be constructed for the first time. Three‐dimensional models of the trace fossil demonstrate that the central zone is composed of stacked disc‐shaped layers. The structure is inferred to result from collapse of sediment below a surficial cone created by the trace‐maker from excavated sediment produced during burrowing. The fill of the radial burrows is herein determined to be composed of angle of repose laminae that are inclined towards the central zone rather than the meniscate backfill documented in the ichnogeneric diagnosis and all subsequent descriptions. The structure of the fill resulted from the trace‐making organism filling its burrows from a dwelling position close to the central boss, probably with material excavated from other parts of the burrow system. This study also reports for the first time subtle conical structures above the radial galleries that are inferred to result from collapse cone feeding. The new fully three‐dimensional data set created of the burrow and the near‐burrow environment allows for a new palaeobiological understanding of the burrow, which suggests that a crustacean trace‐maker is most likely.

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