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Baryte-bearing nodules from the Middle Lias of the English east midlands1

Published online by Cambridge University Press:  14 March 2018

J. H. Taylor
J. H. Taylor*
Affiliation:
King's College, University of London
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Extract

The Middle Lias of Rutland, east Leicestershire, and north-west Northamptonshire was described by Judd in 1875 as comprisingan upper ferruginous member—-the Marlstone Rock Bed-—and a lowerargillaceous division of blue clays, often micaceous or sandy, and carryingbands of 'septaria' and of 'ironstone balls'. In the septaria he recordedthe occurrence of 'specular-iron, zinc-blende and pyrites'.

During the six-inch survey of one-inch New Series sheets 157 (Stam-ford) and 171 (Kettering) together with the adjacent parts of sheets 156(Leicester) and 170 (Market Harborough) a considerable area of thelower argillaceous division was mapped.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 208 , March 1950 , pp. 18 - 26
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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Footnotes

1

Published with the permission of the Director of H.M. Geological Survey

References

Page 18 note 2. J. W. Judd, The Geology of Rutland. Mem. Geol. Surv., 1875.

Page 19 note 1 Lang, W. D., Spath, L. F., and Richardson, W. A., Shales with "beef", a sequence in the Lower Lias of the Dorset coast. Quart. Journ. Geol. Soc. London, 1923, vol. 79, pp. 47-99. [M.A. 9.-535.]Google Scholar

Page 19 note 2. S.I. Tomkeieff, On the occurrence and mode of origin of certain kaolinite-bearing nodules in the Coal Measures. Proc. Geol. Assoc. London, 1927, vol. 38, pp. 518-547. [M.A. 3-555.]

Page 21 note 1. J. H. Taylor, Petrology of the Northampton Sand Ironstone formation. Mem. Geol. Surv.. 1949, pp. 48-50.

Page 22 note 1. These numbers refer in all cases to the Geological Survey's English series of microscope slides.

Page 22 note 2. Spectrographic analysis by Dr. J. A. C. McClelland shows a strontium content in the baryte of approximately 2.5 %.

Page 23 note 1. Richardson, W. A., The relative age of concretions. Geol. Mag. London, 1921, vol. 58, pp. 114-124. [M.A. 1-399.]Google Scholar

Page 24 note 1. North, F. J. and Howarth, W. E., On the occurrence of millerite and associated minerals in the Coal Measures of South Wales. Proc. S. Wales Inst. Eng., 1928, vol. 44, pp. 325-348. [M.A. 4-84.]Google Scholar

Page 24 note 2. Richardson, W. A., On the origin of septarian structure. Min. Mag., 1919, vol. 18, pp. 327-338.CrossRefGoogle Scholar

Page 24 note 3. Goldschmidt, V. M., The principles of distribution of chemical' elements in minerals and rocks. Journ. Chem. Soc. London, 1937, pp. 655-673. [M.A. 7-165.]Google Scholar

Page 24 note 4. Clarke, F. W., The data of geochemistry. 5th edit., Bulk U.S. Geol. Surv.. 1924, no. 770, p. 30.Google Scholar

Page 24 note 5. Guimarães, D., Mineral deposits of magmatic origin. Econ. Geol., 1947, vol. 42, p. 733.CrossRefGoogle Scholar

Page 25 note 1. Goldschmidt, V. M, Geochemische Verteilungsgesetze der Elemente. IX. Die Mengenverhältnisse der Elemente und der Atom-Artcn. Skrifter Norske Videnskaps- Akad. Oslo, I. Mat.-Naturv. Kl., 1938, for 1937, no. 4, pp. 81-82. [M.A. 7-166.]Google Scholar