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VI.—On the Occurrence of Neocomian Sands with Phosphatic Nodules at Brickhill, Bedfordshire
Published online by Cambridge University Press: 01 May 2009
Extract
In a traverse through part of Buckinghamshire and Bedfordshire last vacation, with the object of tracing the extent of the Cambridge Greensand, I was informed of some recently opened Coprolite works at Brickhill, near Bletchley. On further inquiry, they proved to be the “red coprolites,” a term applied by the workmen to the phosphatic nodules of the Neocomian like those of Potton and Upware (the Cambridge Greensand and Gault nodules being known as the “black coprolites”).
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References
page 373 note 1 In the lower part they are more numerous and blacker.
page 373 note 2 Walker, J. F., Geol. Mag. 1867, Vol. IV. p. 309.CrossRefGoogle Scholar
page 373 note 3 Walker, op. cit. p. 310.
page 373 note 4 I was informed that about four years ago they bored for coal in this yard!
page 373 note 5 Geol. Mag. 1866, Vol. III. p. 153.Google Scholar
page 373 note 6 MrWalker, J. F. has kindly examined and confirmed my identifications of those species described by him in the Geol. Mag. Vol. IV. p. 454; Vol. V. p. 399.Google Scholar
page 374 note 1 Mr. Walker informs me that this species has lately been also met with at Folkestone.
page 374 note 2 I am indebted to Mr. Davidson for this identification. He informs me that “the same variety occurs in the Bargate stone (Upper Neocomian) of Guildford and Godalming in Sussex.”
page 374 note 3 I hope to be able to add to this list as the workings go on, the result of which may prove worthy of another communication to this Magazine.
page 374 note 4 Faint striæ have been observed on some of the Upware specimens. See MrWalker's, J. F. article in Geol. Mag. 1868, Vol. V. p. 403, Plates XVIII. and XIX.Google Scholar
page 374 note 5 My father has since obtained for the Woodwardian Museum a few sponges from Brickhill.
page 375 note 1 The eroded appearance of the Cambridge coprolites has frequently, and to a great extent incorrectly, been referred to the trituration produced by washing in the mills.
page 375 note 2 Vide analysis by DrVoelcker, , Geol. Mag. 1866, Vol. III. p. 154.Google Scholar
page 375 note 3 Ann. Nat. Hist. Nov. 1866.
page 375 note 4 This theory has no reference to the nodules of the Gault and Cambridge Greensand, which are far too pure for such an origin.
page 375 note 5 ProfessorMorris, has already (Geol. Mag. Vol. IV. p. 459)Google Scholar from similar evidence stated his conviction that the Wealden beds were present over the neighbourhood of Aylesbury.
page 375 note 6 M. J. Harris Hall, of St. John's College, informs me that he found coprolites scattered over this hill at Brickhill about two years ago. The result of his inquiry into the Potton and Upware deposits (Sedgwick Prize Essay) will be published very soon.