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III.—On the Ballantrae Rocks of South Scotland and their Place in the Upland Sequence

Published online by Cambridge University Press:  01 May 2009

Charles Lapworth
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Extract

Next to the metamorphic region of the Northern Highlands there is perhaps no area in Britain where the strata have been so contorted and convulsed as in the great Lower Palæozoic region of the Southern Uplands of Scotland, and it is only by the zonal method of stratigraphy that these complexities can ever be successfully unravelled. So far as the present results of the application of that method enable us to judge, it appears that, underlying all these stratigraphical complexities, there is, in reality, a broad tectonic structure of great simplicity. For, if we make exception, on the one hand, of the lowest strata (the Ballantrae or Arenig rocks), which, as we have seen, only rise to the surface within the limits of the Ballantrae district; and on the other hand of the highest formations (Wenlock-Ludlow), which merely skirt the Upland plateau upon its north-west and south-west flanks, we find that almost the whole of the Lower Palæozoic strata of the Uplands are naturally grouped in two grand lithological terranes, viz. (I.) a Lower Terrane (Moffat Terrane), including strata ranging from the Upper Llandeilo to the Upper Llandovery; and (II.) an Upper Terrane (Gala or Queensberry Terrane), embracing strata generally of Tarannon age.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 2 , February 1889 , pp. 59 - 69
Copyright
Copyright © Cambridge University Press 1889

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References

page 60 note 1 Lapworth, , Girvan Succession, Q.J.G.S. 1882. pp. 537–666.CrossRefGoogle Scholar

page 60 note 2 Ibid, Moffat Series, Q J.G.S. 1878, pp. 240–346.

page 60 note 3 Compare Tables Q.J.G.S. 1882, p. 660, and 1878, p. 250.Google Scholar

page 60 note 4 Marr, and Nicholson, , Q.J.G.S. 1888, pp. 706–708.Google Scholar

page 61 note 1 Q.J.G.S. 1882, p. 659.Google Scholar

page 61 note 2 Marr, and Nicholson, , Q.J.G.S. 1888, pp. 674–678, etc.Google Scholar

page 62 note 1 Lapworth, , GEOL. MAG. 1883, p. 138,Google Scholar etc.

page 64 note 1 Compare Maps 15, 9, 3, 4, etc. and the accompanying Explanations, Geol. Survey, Scotland.

page 64 note 2 Explan. Sheet 15, p. 14, etc.

page 65 note 1 Compare Lapworth, , Transactions Geol. Soc. Glasgow, 1878, pp. 78 to 84,Google Scholar etc.

page 65 note 2 Sedgwick, , 1849, Rep. Brit. Assoc. p. 103;Google Scholar Nicol, . Q.J.G.S. 1850, p. 53;CrossRefGoogle Scholar Murchison, ibid. 1851, p. 137; Siluria, 4th edition, pp. 148–158; Geikie, A., Trans. Geol. Soc. Glasgow, 1867, p. 74;Google Scholar Explan. Sheet 3, Geol Survey Scotland, 1873, pp. 4–18;Google Scholar ibid. sheet 15, p. 9, etc.

page 67 note 1 Lapworth, Geol. Dist. Rhabdophora, Tullberg, Skånes Graptolither, etc.