Abstract
MR. H. W. MONCKTON has done good service in calling the attention of geologists to the section through Brentwood Common (NATURE, vol. xlii. p. 198); and I am glad to say that I entirely agree with the interpretation of the section which he has suggested. The classification of all these beds as “Lower Bagshot” is in fact but a repetition of the error committed in former years in the Newbury country (see Q.J.G.S., vol. xliv, pp. 178, 179). Lithological and palæontological evidence now concur to prove what seemed to me in the highest degree probable when the discovery of fossils in the Bagshot Beds at Frierning was announced in the new edition of the “Geology of London” last year, and what I suggested on general grounds three years ago (see Geological Magazine, March 1887, p. 115); namely, that in the Essex area there is an attenuation of the lower sands implying a transgressive relation of the “Bagshots” to the London Clay, such as has been shown by me (Q.J.G.S., vols. xliii. and xliv.) to occur along the northern margin of the Bagshot area from Englefield Green to Farley Hill, south of Reading.
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IRVING, A. The Essex Bagshots. Nature 42, 222 (1890). https://doi.org/10.1038/042222d0
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DOI: https://doi.org/10.1038/042222d0
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