Sheinwoodian

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Sheinwoodian
433.4 ± 0.8 – 430.5 ± 0.7 Ma
↓
Hughley Brook, Apedale, UK
52°34′52″N 2°38′20″W / 52.5811°N 2.6389°W / 52.5811; -2.6389
Lower GSSP ratified1980[4]
Upper boundary definitionFAD of the graptolite Cyrtograptus lundgreni
Upper boundary GSSPSheinton Brook, Homer, England
52°36′56″N 2°33′53″W / 52.6156°N 2.5647°W / 52.6156; -2.5647
Upper GSSP ratified1980[4]

In the

Ma and 430.5 ± 0.7 Ma (million years ago), approximately. The Sheinwoodian Age succeeds the Telychian Age and precedes the Homerian Age.[5]

Definition

The Wenlock-Llandovery boundary is defined by the first occurrence of Cyrtograptus centrifugus. The stage is named after Sheinwood village, north of Much Wenlock. The Buildwas Formation of Shropshire, United Kingdom contains the type section.[6]

References

  1. doi:10.1017/S0263593300000377
    .
  2. doi:10.1016/S0031-0182(03)00304-3
    .
  3. ^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  4. ^ a b c Holland, C. (1982). "The State of Silurian Stratigraphy" (PDF). Episodes. 1982: 21–23. Retrieved 11 December 2020.
  5. ISBN 9780521786737
    .
  6. ^ Silurian System


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