Abstract
I FEEL that the evidence cited by Mr. T. R. Owen does not necessarily support an Upper Westphalian (Morganian) age for the orogeny and granites. An intra-Westphalian orogeny could only be satisfactorily demonstrated by the discovery of younger unconformable Carboniferous sediments, as, for example, in northern Spain1. Such post-orogenic sediments are not known in Devon and Cornwall. However, our knowledge of this region is still very meagre, and it may be that they will yet be found. Meanwhile, it seems to me preferable on the present evidence to correlate the main orogeny in Devon and Cornwall with that in adjacent regions to the north. In this, I agree with Kulp et al. 2 and Lambert and Mills3 ; but also with Mr. Owen that the case has not been proved.
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References
Wagner, R. H., Estudios Geologicos, 16, 55 (1960).
Kulp, J. L., Long, L. E., Giffin, C. E., Mills, A. A., Lambert, R. St. J., Giletti, B. J., and Webster, R. K., Nature, 185, 495 (1960).
Lambert, R. St. J., and Mills, A. A., Ann. N.Y. Acad. Sci., 91, 378 (1961).
Kulp, J. L., Science, 133, 1105 (1961).
Holmes, A., Trans. Edin. Geol. Soc., 17, 183 (1959).
Dodson, M. H., Miller, J. A., and York, D., Nature, 190, 800 (1961).
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BUTCHER, N. Age of the Orogeny and Granites in South-West England. Nature 191, 486–487 (1961). https://doi.org/10.1038/191486b0
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DOI: https://doi.org/10.1038/191486b0
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