Cited by 73Paleontology and Stratigraphy of FossilsPaleontology and Evolutionary BiologyGeological formations and processes

Post-Cambrian closure of the deep-water slope-basin taphonomic window

Orr, Patrick J., Benton, Michael J., Briggs, Derek E.G.·2003·Geology

Abstract

Exceptional faunas (Konservat-Lagerstatten that preserve traces of volatile nonmineralized tissues) are statistically overabundant in the Cambrian Period; almost all examples preserved in continental-slope and shelf-basin environments are of this age. The hypothesis that an increase in the amount and complexity of bioturbation was an important agent in the elimination of this deep-water slope-basin taphonomic window is supported. Post-Cambrian ichnofaunal assemblages contain a higher proportion of pascichnia and agrichnia, ethologies produced by a mobile infauna. They also illustrate the lateral partitioning of organisms into different environmental niches; both opportunistic and equilibrium infaunas occur in low-oxygen environments in which the preservation of nonbiomineralized tissues was favored. Direct consumption of carcasses by bioturbating organisms was less important than changes to sediment properties as a result of bioturbation, notably enhanced microbial degradation of reactive organic matter, increased permeability, and the disruption of geochemical gradients necessary for mineral authigenesis.

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Crossref · 10.1130/g19193.1

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  • During the Precambrian, from the late Archean until the Ediacaran-Cambrian boundary interval, near-surface diagenetic processes including phosphatization and pyritization likely occurred closer to the sediment surface than at later times, leading to earlier and more rapid permineralization of unprocessed carbonaceous materials.

    “The key feature of this model is that during the Precambrian, from the late Archean until the Ediacaran-Cambrian boundary interval, near-surface diagenetic processes including phosphatization and pyritization likely occurred closer to the sediment surface than at later times (McIlroy & Logan, 1999; Orr et al., 2003; Bailey et al., 2006), leading to the earlier and more rapid permineralization of”

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Authors
Orr, P. J., Benton, M. J., & Briggs, D. E. G.
Affiliations
  • University College Dublin (IE)
  • University of Bristol (GB)
  • Yale University (US)
Venue
Geology
Published
2003
Volume
31
Issue
9
Pages
769
ISSN
0091-7613 (ISSN-L)
OpenAlex
W2087292482
Cited by
73
References
33
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2021: 2 · 2020: 1 · 2019: 2 · 2018: 2 · 2017: 5 · 2016: 4 · 2015: 2 · 2014: 7 · 2013: 2 · 2012: 5
FWCI
1.29
Type
journal article
Language
en
Open access
closed
Locations
  • Geology (publishedVersion)
  • Explore Bristol Research (submittedVersion)
  • Bristol Research (University of Bristol) (submittedVersion)
Funders
University of Chicago
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Evolutionary Biology
  • Physical Sciences › Earth and Planetary Sciences › Earth-Surface Processes › Geological formations and processes
Keywords
taphonomy, Lagerstätte, bioturbation, continental slope, infauna, low oxygen environment, authigenesis, microbial degradation, sediment permeability, geochemical gradients, Cambrian

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