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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

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