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Tetradella complicata (Salter) and some Caradoc species of the Genus

Published online by Cambridge University Press:  01 May 2009

J. C. Harper
J. C. Harper
Affiliation:
University of Liverpool
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Extract

In this country the best known species of Tetradella is T. complicata (Salter), a form which is usually regarded as typical of Caradoc rocks and has been widely quoted in faunal lists as such. It happens, however, that this species was originally described as Beyrichia complicata, by Salter (Phillips and Salter, 1848, p. 352, pi. 8, fig. 16) from the Llandeilo Beds of Llan Mill, near Narberth, and it is extremely unlikely that it ever occurs in Caradoc beds. This confusion has no doubt arisen from the inaccuracies in Salter's original figure, the briefness of the accompanying description and the fact that McCoy figured what is obviously another species of Tetradella under the same name from the Caradoc Beds of Pont y Meibion (McCoy, 1851, pl. IE, fig. 3). At a later date T. R. Jones refigured T. complicata from Llan Mill with more accuracy than Salter and with a fuller description, but unfortunately figured under the same name a form from the Caradoc of Harnage, giving also a list of Llandeilo and Bala localities where T. complicata was supposed to occur (Jones, T. R., 1855, pp. 163–5, pl. vi, figs. 1–5). In addition to this figures have appeared in various textbooks and similar works of a general nature which are usually too poor for specific determination although it is obvious that in the main they cannot be referred to Tetradella complicata (Salter).

Type
Articles
Information
Geological Magazine , Volume 84 , Issue 6 , December 1947 , pp. 345 - 353
Copyright
Copyright © Cambridge University Press 1947

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References

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