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VI.—On the Occurrence of Aragonite in the Middle Lias of Leicestershire; with some remarks on the calcareous character of the spinatus beds

Published online by Cambridge University Press:  01 May 2009

A. R. Horwood
A. R. Horwood
Affiliation:
Leicester Museum
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Extract

The Liassic strata generally are so barren of any minerals of importance or of an appreciable size or extent that the record of the discovery of one not hitherto known to occur in a crystalline form, apart from the part it plays in the formation of shell-layers at that horizon, is assuredly of interest. Hitherto the Liassic strata have not yielded any minerals unassociated with shell-structure, except selenite, which occurs commonly in some Upper Liassic clays, whilst it is not unusual to find fossils converted into iron-pyrites or marcasite, especially at certain horizons. The Doggers of Yorkshire are noteworthy instances of this kind. In the Middle Lias, zinc, nickel, and cobalt are found in the iron-ores of the Cleveland district.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 4 , April 1910 , pp. 173 - 178
Copyright
Copyright © Cambridge University Press 1910

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References

page 174 note 1 Rudler, Vide, “Minerals of the British Isles”: Mem. Geol. Surv., 1905, p. 191.Google Scholar

page 174 note 2 See Geol. Mag., 1907, p. 471. These boulders varied in size from that of a pea to that of a mass 100 tons in weight.

page 174 note 3 Geol. Mag., 1907, pp. 462–3

page 174 note 4 Ibid., 1886, p. 296 et seqq.

page 174 note 5 Trans. Northants Nat. Hist. Soc., 1907, p. 105.

page 175 note 1 Chemisohe Mineralogie, 1896, p. 156.

page 175 note 2 Neues Jahrb., 1871, p. 288.

page 175 note 3 Geol. Mag., 1907, pp. 462–3.

page 176 note 1 Quart. Journ. Geol. Soc., 1879, vol. xxxv, pp. 63 et seqq.Google Scholar

page 176 note 2 See also Kendall, P. F., Geol. Mag., 1883, pp. 497 et seqq.Google Scholar, for a further list of forms preserved in calcite and aragonite respectively in the Coralline Crag. His researches bear out in a remarkable way, as to that formation at least, those of Sorby, whilst in so far as my own observation has gone I am able to corroborate his conclusions in the case of the Middle Lias (vide supra).

page 176 note 3 Ibid., p. 84.

page 177 note 1 Quart. Journ. Geol. Soc., 1865, vol. xxi, pp. 413–21.Google Scholar

page 177 note 2 “On the Mineralogical Constitution of Calcareous Organisms”: Geol. Mag., 1888, p. 66.

page 177 note 3 Though so called this locality is close to Lowesby Station (G.N.R.), and must not be confounded with the cutting near Tilton Station (joint L.N.W.R. and G.N.R.). a locality more widely known than the Lowesby one.