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Title: Widespread delayed mixing in early to middle Cambrian marine shelfal settings

Constraining the timing and motivation of CSR in global view

https://doi.org/10.1016/j.palaeo.2014.01.024

wWillie Wei-Lun Chen

Department of Geoscience, National Taiwan University

Previous view

Introduction

Initial view:ㄇalong with CE

ㄇInitial view:ㄇalong with

C-E transition

  • Began along with the rapid diversification of infauna(Precambrian-Cambrian transition), or even occurred in late Neoproterozoic
  • Marked by the appearance of the index fossil, three-dimensional burrow Treptichnus pedum and the disappearance of widespread matground structures (( Seilacher and Pflüger, 1994,)
  • classic and cited by many publications

Subsequent study: gradual, protracted process

Subsquent study: gradual, protracted process

  • Tommotian (McIlroy and Logan, 1999)

  • Between Tommotian and Atdabanian(Droser and Bottjer, 1988)

  • Base of Atdabanian(Droser et al., 2002)

Paucity: rapid and conspicuous

Study Area

1. lower Cambrian Wood Canyon Formation (Great Basin,US)

2. lower to middle Cambrian Pioche (and correlative Bright Angel Shale) Formations (Great Basin,US)

3. lower Cambrian Torreárboles Sandstone (Guadalajara, Spain)

4. lowermost Cambrian Chapel Island Formation(Newfoundland, Canada)

4

3

1,2

overview map

ㄘHypothesis

Diplocraterion parallelum, Mángano and Buatois(2017)

hypothesis

Deep-tiered trace fossils found in the period, are belong to suspension feeding metazoa

less efficient on increased advection of bottom-waters into the substrate

The progress of CSR may pushed by the emergence of Trilobite in Cambrian series 2

Rusophycus radialis,

Mángano and Buatois(2016)

Method and Criteria

Over 450 m of section , comprising over 24,300 discrete beds, were examined, and data were collected

method and criteria

  • choose heterolithic succession

importance of facies

six ichnofossils criteria:

1) bedding thickness

2) fabric disruption

3) depth of bioturbation

4) bioglyphic preservation

5) the paleobiological and paleoecological complexity of trace fossil assemblages

6) surficially produced physical sedimentary structure

A

Q

&

Result

Discussion

References

References

  • Seilacher, A., Pflüger, F., 1994. From biomats to benthic agriculture: a biohistoric revolution.
  • McIlroy, Duncan, and Graham A. Logan. "The impact of bioturbation on infaunal ecology and evolution during the Proterozoic-Cambrian transition." Palaios 14.1 (1999): 58-72.
  • Droser, Mary L., and David J. Bottjer. "Trends in depth and extent of bioturbation in Cambrian carbonate marine environments, western United States." Geology 16.3 (1988): 233-236.

References

  • Droser, Mary L., Sören Jensen, and James G. Gehling. "Trace fossils and substrates of the terminal Proterozoic–Cambrian transition: implications for the record of early bilaterians and sediment mixing." Proceedings of the National Academy of Sciences 99.20 (2002): 12572-12576.
  • Mángano, M. Gabriela, and Luis A. Buatois. "The Cambrian revolutions: Trace-fossil record, timing, links and geobiological impact." Earth-science reviews 173 (2017): 96-108.

References

References

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