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Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland
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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 of three-dimensional burrowing
across the Proterozoic–Cambrian boundary. Although
T. 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 the T. pedum Zone.
Cambridge University Press (CUP)
Title: Burrowing below the basal Cambrian GSSP, Fortune Head, Newfoundland
Description:
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 of three-dimensional burrowing
across the Proterozoic–Cambrian boundary.
Although
T.
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 the T.
pedum Zone.
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