II.—Some Graptolite Zones in the Arenig Rocks of Wales

Gertrude L. Elles

doi:10.1017/S0016756800119612

II.—Some Graptolite Zones in the Arenig Rocks of Wales

Published online by Cambridge University Press: 01 May 2009

Gertrude L. Elles

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Gertrude L. Elles: Affiliation:
Newnham College, Cambridge.

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The Arenig Series, as originally defined by Sedgwick, has undergone much subsequent modification by its founder and other authors. There have been separated off from it the Tremadoc Series at the base, and the Llandeilo Series above, and a certain amount of ambiguity has arisen as to what constitutes the Arenig thus restricted; possibly, therefore, the recognition of three well-defined graptolite sub-faunas within the series in certain districts may help in some degree towards the solution of the problem.

Type: Original Articles
Information: Geological Magazine , Volume 1 , Issue 5 , May 1904 , pp. 199 - 211

DOI: https://doi.org/10.1017/S0016756800119612 [Opens in a new window]
Copyright: Copyright © Cambridge University Press 1904

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References

^{page 200 note 1} Geol. Mag., 1902, p. 118.

^{page 200 note 2} Brit. Assoc., 1903.

^{page 200 note 3} Quart. Journ. Geol. Soc., 1885, p. 476.

^{page 200 note 4} Quart. Journ. Geol. Soc., 1896, p. 523.

^{page 200 note 5} Summary of Progress, 1902.

^{page 200 note 6} Mem. Geol. Survey, vol. iii, p. 161.

^{page 200 note 7} Quart. Journ. Geol. Soc., 1876, p. 134.

^{page 206 note 1} Quart. Journ. Geol. Soc., 1891, p. 368.

^{page 207 note 1} “Geology of North Wales,” vol. iii.

^{page 208 note 1} Hicks, Brit. Assoc. Rep., 1872, 1873: Quart. Journ. Geol. Soc., 1875, p. 167.

^{page 208 note 2} Hopkinson, Brit. Assoc. Rep., 1872, 1873.

^{page 208 note 3} Cf. lists of Hicks and Hopkinson, loc. cit., and Hopkinson and Lapworth, Quart. Journ. Geol. Soc., 1875, p. 631.

^{page 209 note 1} Cf. lists of Hicks and Hopkinson, loc. cit.

^{page 210 note 1} Loc. cit.

^{page 210 note 2} Loc. cit.

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II.—Some Graptolite Zones in the Arenig Rocks of Wales

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