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

Published online by Cambridge University Press:  01 May 2009

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

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
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.