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Intra-Jurassic Movements and the Underground Structure of the Southern Midlands

Published online by Cambridge University Press:  01 May 2009

Arthur Hubert Cox  and
Arthur E. Trueman
Arthur Hubert Cox
Affiliation:
University College of South Wales and Monmouthshire, Cardiff.
Arthur E. Trueman
Affiliation:
University College of South Wales and Monmouthshire, Cardiff.
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Summary

1. The occurrence of anticlinal folding during Jurassic times has been demonstrated by Mr. Buckman's detailed zonal work in the Vale of Moreton and in the North Cotteswolds. These anticlines are indicated on the map by marked bends in the outcrops of the Lower Jurassic formations.

2. Similar bendings of outcrops are seen at several localities in the Eastern and Southern Midlands, and the structure at one such locality—Melton Mowbray—has recently proved to be anticlinal.

3. Intra-Jurassic folding betrays itself by non-sequences and reduced thicknesses of Lower Jurassic zones along anticlinal axes. Such evidence suggests the existence of anticlinal structures in the neighbourhood of Banbury, Weedon, and perhaps also Market Harborough, in addition to the cases mentioned above.

4. Movement was probably almost continuous along some or all of these axes, at least from Rhætic to Bajocian times. Outcrops of post-Bathonian formations are not affected by the flexures, although the folding was perhaps renewed in later Jurassic or even Tertiary times.

5. Several of these lines of Jurassic folding probably follow the lines of earlier and more powerful movements. The bearing of such flexures on the structure of the Palæozoic floor is discussed.

6. Attention is called to a curious symmetry in the disposition of the Palæozoic formations on either side of a prolongation of the Pennine axis.

Type
Original Articles
Information
Geological Magazine , Volume 57 , Issue 5 , May 1920 , pp. 198 - 208
Copyright
Copyright © Cambridge University Press 1920

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References

page 198 note 1 Cox, , “A Report on Magnetic Disturbances in Northamptonshire and Leicestershire and their Relations to the Geological Structure”: Phil. Trans., ser. A, vol. 219, 1919, Appendix, pp. 73–135.CrossRefGoogle Scholar

page 198 note 2 Loc. cit., p. 122.Google Scholar

page 198 note 3 Buckman, , “The Toarcian of Bredon Hill”: Quart. Journ. Geol. Soc., vol. lix, 1903, p. 449.Google Scholar

page 198 note 4 A list of Mr. Buckman's chief papers on these subjects is given in Quart. Journ. Geol. Soc., vol. lxvi, 1910, p. 53.Google Scholar

page 198 note 5 Op. supra cit., 1903, p. 449.Google Scholar

page 199 note 1 Richardson, , “The Evidence for a Non-Sequence between the Keuper and Rhætic Series in North-West Gloucestershire, etc.”: Quart. Journ. Geol. Soc., vol. lx, 1904, pp. 349–58.CrossRefGoogle Scholar

page 199 note 2 The Bredon syncline, as Mr. Buckman has shown, is a prolongation of the Cleeve Hill syncline (Buckman, op. cit., 1903).Google Scholar

page 200 note 1 Buckman, , “The Cleeve Hill Plateau”: Quart. Journ. Geol. Soc., vol. lviii, 1897, pl. xlviGoogle Scholar; and also “The Bajocian of the North Cotteswolds”: ibid., vol. lvii, 1901, p. 146.

page 200 note 2 Trueman, , “The Lias of South Lincolnshire”: Geol. Mag., 1918, p. 108.Google Scholar

page 201 note 1 The thicknesses of zones have been obtained mainly from the following sources: Judd, The Geoloqy of Rutland, etc. (Mem. Geol. Surv.), 1875Google Scholar. Walford, , Proc. Warwick. Nat. Field Club, 1878, p. 37Google Scholar. Thompson, , Journal Northants Nat. Hist. Soc., vol. ii, 1882–1883Google Scholar. Wilson, & Crick, , Geol. Mag., 1889, p. 296Google Scholar. Thompson and others in Report of Brit. Assoc., 1891, pp. 334–51Google Scholar. Woodward, , Lias of England and Wales (Mem. Geol. Surv.), 1893Google Scholar. Richardson, , Handbook to the Geology of Cheltenham, etc., 1904Google Scholar. Trueman, , Geol. Mag., 1918, pp. 106–8.Google Scholar

page 202 note 1 Judd, , The Geology of Rutland, etc. (Mem. Geol. Surv.), 1875, p. 83, etc.Google Scholar

page 202 note 2 Although in some of our figures. perhaps a portion of the exaratum zone may also be included.Google Scholar

page 202 note 3 Buckman, , “Certain Jurassic (Lias-Oolite) Strata of South Dorset, etc.”: Quart. Journ. Geol. Soc., vol. lxvi, 1910, p. 88.Google Scholar

page 203 note 1 Trueman, , Geol. Mag., 1918, pp. 67–70.Google Scholar

page 203 note 2 Buckman, , “Jurassic Chronology: I. Lias”: Quart. Journ. Geol. Soc., vol lxxiv, 1919.Google Scholar

page 203 note 3 Trueman, , “The Evolution of the Liparoceratidæ”: Quart. Journ. Geol. Soc., vol. lxxiv 1919, p. 252, etc.Google Scholar

page 205 note 1 Rastall, , Cambridgeshire: Geology in the Field, pt. i, 1910, p. 143.Google Scholar

page 205 note 2 Cox, , Phil. Trans., ser. A, vol. 219, Appendix, 1919.Google Scholar

page 205 note 3 Buckman, , “The Bajocian of the North Cotteswolds”: Quart. Journ. Geol. Soc., vol. lvii, 1901, pp. 147–9.Google Scholar

page 205 note 4 Op. cit., p. 154.Google Scholar

page 205 note 5 Presidential Address to Section C (Geology), Report Brit. Assoc., Newcastle-on-Tyne, 1916, p. 383.Google Scholar

page 205 note 6 Report of the Royal Commission on Coal Supplies, pt. ix, Appendix iii.Google Scholar

page 205 note 7 Cambridgeshire: Geology in the Field, pt. i, 1910, p. 143.Google Scholar

page 206 note 1 Cox, , Phil. Trans., ser. A, vol. 219, Appendix, 1919, p. 124.Google Scholar

page 206 note 2 Report of the Royal Commission on Coal Supplies, pt. ix, Appendix iii, 1905.Google Scholar

page 206 note 3 “Some Effects of Earth-movement on the Coal Measures of the Sheffield District,” Part II: Trans. Inst. Min. Eng., vol. li, Pt. iii, 1916, p. 107 (with references).Google Scholar

page 206 note 4 Matley, , “The Upper Keuper (or Arden) Sandstone Group and Associated Rocks of Warwickshire”: Quart. Journ. Geol. Soc., vol. lxviii, 1912, p. 269.Google Scholar

page 206 note 5 Geology of the Country around Lichfield (Mem. Geol. Surv.), 1919, p. 7.Google Scholar

page 207 note 1 Compare Matley, op. supra cit.: also Davies, A. Morley & Pringle, J., “Two Deep Borings at Calvert…”: Quart. Journ. Geol. Soc., vol. lxix, 1913, p. 335Google Scholar; also Baker, , “Charnian Movement in East Kent”: Geol. Mag., 12 VI, Vol. IV, 1917, p. 398.CrossRefGoogle Scholar

page 207 note 2 Strahan, , Presidential Address: Quart. Journ. Geol. Soc., vol. lxix, 1913, p. lxxGoogle Scholar. See also A. Morley Davies & J. Pringle, ibid., p. 134.

page 207 note 3 Strahan, op. cit.Google Scholar