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Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland

Published online by Cambridge University Press: 16 May 2001

PAUL M. MYROW and

JAMES G. GEHLING: Affiliation:
South Australian Museum, North Terrace, Adelaide, South Australia 5000, Australia
SÖREN JENSEN: Affiliation:
Department of Earth Sciences, University of California, Riverside, California 92521, USA
MARY L. DROSER: Affiliation:
Department of Earth Sciences, University of California, Riverside, California 92521, USA
PAUL M. MYROW: Affiliation:
Department of Geology, The Colorado College, Colorado Springs, CO 80903, USA
GUY M. NARBONNE: Affiliation:
Department of Geological Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada

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Abstract

The range ofTreptichnus pedum, the index trace fossil for theTreptichnus 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 ofTreptichnus isp., even further below the GSSP thanT. pedum in the Fortune Head section, and in other terminal Proterozoic successions around the globe, supports the concept of a gradational onset of three-dimensional burrowing across the Proterozoic–Cambrian boundary. AlthoughT. pedum remains a reasonable indicator for the base of the Cambrian Period, greater precision in the stratotype section can be achieved by a detailed re-evaluation of the stratigraphic ranges and the morphological variation of ichnotaxa included in theT. pedum Zone.

Type: RAPID COMMUNICATION
Information: Geological Magazine ,Volume 138 ,Issue 2, March 2001, pp. 213 - 218
DOI:https://doi.org/10.1017/S001675680100509X[Opens in a new window]
Copyright: © 2001 Cambridge University Press

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