GSSP for the Base of Telychian


Definition:

The base of the Telychian Stage is defined in an abandoned quarry forming part of the Cefn-cerig Road section, Wales, UK, and is just above the highest record of the brachiopod Eocoelia intermedia and below the earliest record of the succeeding species Eocoelia curtisi.


Location:

The GSSP is located in an abandoned quarry forming part of the Cefn-cerig Road section, just below the top of the Wormwood Formation, Wales, UK.
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Sedimentology:

The GSSP lies within the bioturbated sandstones and siltstones of the Wormwood Formation.
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Primary Markers:

The base of the Telychian Stage is defined at a point just above the highest record of the brachiopod Eocoelia intermedia and below the earliest record of the succeeding species Eocoelia curtisi.

Secondary Markers:

Acritarchs:
The boundary horizon corresponds with the base of the Biozone 4 acritarch fauna of Hill (1974). It is characterized by the incoming of Deunffia monospinosa, Domasia bispinosa and Pterospermella cf. foveolata.

Other Locations around the World:

See:
Holland, C. H. and Bassett, M. G. (eds.). A global standard for the Silurian System. National Museum of Wales, Geological Series 9, Cardiff.

References:

Cocks, L. R. M., 1989. The Llandovery Series in the Llandovery Area. In: Holland, C. H. and Bassett, M. G. (eds.). A global standard for the Silurian System. National Museum of Wales, Geological Series 9, p. 36 - 50, Cardiff.