Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland

@article{Gehling2001BurrowingBT,
  title={Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland},
  author={James G. Gehling and S{\"o}ren Jensen and Mary L. Droser and Paul M. Myrow and Guy M. Narbonne},
  journal={Geological Magazine},
  year={2001},
  volume={138},
  pages={213 - 218}
}
The range of Treptichnus pedum, the index trace fossil for the Treptichnus pedum Zone, extends some 4 m below the Global Standard Stratotype-section and Point for the base of the Cambrian Period at Fortune Head on the Burin Peninsula in southeastern Newfoundland. The identification of zigzag traces of Treptichnus isp., even further below the GSSP than T. pedum in the Fortune Head section, and in other terminal Proterozoic successions around the globe, supports the concept of a gradational onset… 
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TLDR
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