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III.—The Igneous Rocks, etc., of the Neighbourhood of the Warwickshire Coal-field

Published online by Cambridge University Press:  01 May 2009

Frank Rutley
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Extract

These rocks may be classed into five or six more or less distinct groups.

I. Syenitic Rocks (Croft Series).

II. Andesite and Andesitic Tuffs (Caldecote Series).

III. Hartshill Quartzite with Breccia at its base.

IV. Diorites.

V. Andesites or Diorites containing Augite.

VI. Basalts or Diorites containing Olivine.

The three last groups appear to graduate into one another, and seem to correspond with similar rocks described by Mr. Allport. Many of the specimens examined are in a more or less advanced stage of decomposition, calcite, serpentine, pyrites, etc., being very commonly present.

Type
Original Articles
Information
Geological Magazine , Volume 3 , Issue 12 , December 1886 , pp. 557 - 565
Copyright
Copyright © Cambridge University Press 1886

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References

page 557 note 1 On the Diorites of the Warwickshire, Coal-field, Q.J.G.S. vol. xxxv. p. 637Google Scholar.

page 558 note 1 “Lehrbuch der Petrographie,” vol. ii. p. 7, Bonn, 1866Google Scholar.

page 558 note 2 “The Igneous Rocks of Stanner,” Geol. Mag.. Decade III. Vol. III. p. 225 (05, 1886)Google Scholar.

page 559 note 1 See also “On the Pre-Carboniferous Roeks of Charnwood Forest,” by the Rev. Bonney, T. G. and Rev. Hill, E., Q.J.G.S. vol. xxxiv. pp. 119–239, 1878Google Scholar.

page 559 note 2 See also Waller, T. H., Geol. Mag. 1886, p. 323Google Scholar.

page 560 note 1 See also Waller, T. H., Geol. Mag. 1886, p. 323Google Scholar.

page 561 note 1 See also Waller, T. H., Geol. MaG. 1886, p. 324Google Scholar. The Dark Basic Rock.

page 562 note 1 See also Waller, T. H., Geol. Mag. 1866, p. 235Google Scholar. The Quartzite.

page 562 note 2 See also Teall, J. J. H., Hornblende-Bearing Rocks, Geol. Mag. 1886, p. 351Google Scholar.

page 564 note 1 Quart. Journ. Geol. Soc. vol. xxxv. p. 639Google Scholar.

page 564 note 2 Récherches sur les Pseudomorphoses, Tableau II. p. 52, Annales des Mines, t. xvi. 1859.