Roadian

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Roadian
273.01 ± 0.14 – 266.9 ± 0.4 Ma
Chronology
Hercosestria cribrosa, A reef-forming Roadian brachiopod from the Glass Mountains of Texas.

In the

million years ago (Ma). It was preceded by the Kungurian and followed by the Wordian.[3]

Stratigraphy

In 1961, the regional timescale used for the southeastern US had the Wordian and

IUGS timescale in 2001.[7]

The base of the Roadian is defined as the place in the stratigraphic record where fossils of

GSSP) is located in Stratotype Canyon in the Guadalupe Mountains, Texas (31°52′36″N 104°52′36″W / 31.87667°N 104.87667°W / 31.87667; -104.87667
). The top of the Roadian (the base of the Wordian Stage) is at the first appearance of fossils of conodont species Jinogondolella aserrata.

Roadian life

Main page: Category:Roadian life

Olson’s Extinction, a worldwide loss of terrestrial vertebrate life occurred during the Early Guadalupian (Roadian, Wordian).[8]

Notable formations

References

  1. ^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  2. ^ a b "GSSP for Roadian Stage". International Commission on Stratigraphy. Retrieved 13 December 2020.
  3. Cambridge University
    Press
  4. ^ Glenister, B.F. & Furnish, W.M.; 1961: The Permian ammonoids of Australia, Journal of Paleontology 35(4), pp 673–736.
  5. ^ Nassichuk, W.W.; 1964: Pennsylvanian and Permian rocks in the Parry Islands Group, Canadian Arctic Archipelago, Report of activities, field
  6. ^ Furnish & Glenister (1968)
  7. ^ Glenister, B.F.; Wardlaw, B.R.; Lambert, L.L.; Spinosa, C.; Bowring, S.A.; Erwin, D.H.; Menning, M. & Wilde, G.L.; 1999: Proposal of Guadalupian and Component Roadian, Wordian and Capitanian Stages as International Standards for the Middle Permian Series, Permophiles 34: pp 3–11.
  8. PMID 18198148
    .

Literature

External links
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