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DISCUSSION

Journal of the Geological Society, 128, 551-559, 1 November 1972, https://doi.org/10.1144/gsjgs.128.6.0551
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Abstract

Mr P. Evans, congratulated the authors on a very interesting and useful piece of work. There had been so much difference of opinion about the age of high-level erosion surfaces that it was important to have this definite evidence of a Pliocene surface.

The low relief of the 450 m Brassington surface suggested that it had been eroded to a base-level only a little below this. Sissons's Holme Moss surface was about 100 m higher, and Mr. Evans agreed that it would have supplied sediment: base-level might well have been the Bradfield level of about 400 m which is traceable at intervals as far as the south of France.

Old high sea-levels back to about 200 m at something over a million years ago could be plotted to give the rate of fall of sea-level for that spell of time, but to continue back to earlier periods was guesswork. His independent guess put the Brassington Beds at 4 million years, and the authors had guessed 7. In the present state of ignorance about Pliocene dates, the difference between guesses of 4 and 7 million years was not worth arguing about.

The Authors thanked Mr. Percy Evans for his kind remarks, but would naturally prefer to have their 7 million year dating for the sub-Brassington Formation surface accepted as a carefully-reasoned deduction, after many years of palaeobotanical research rather than a 'guess'. Having ascertained that the Kenslow flora was approximately of Mio-Pliocene boundary age, the 7 million year figure was derived

  • © Geological Society of London 1972

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Journal of the Geological Society: 128 (6)
Journal of the Geological Society
Volume 128, Issue 6
November 1972
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DISCUSSION

Journal of the Geological Society, 128, 551-559, 1 November 1972, https://doi.org/10.1144/gsjgs.128.6.0551

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