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II.—The Lias Marlstone of Tilton, Leicestershire

Published online by Cambridge University Press:  01 May 2009

E. Wilson  and
W. D. Crick
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Extract

When the new railway from Nottingham to Market Harborough was made, several instructive sections in the Upper and Middle Lias series were opened out between the latter place and Tilton. Most of these are now covered up and grass-grown, but one of the best is still partially laid bare in the deep cutting at Tilton Station. This Tilton section has become one of considerable interest to the geologists of the Midland district, from the complete and characteristic exposure which it gives of the Marlstone Rock of Leicestershire in its fully developed and unweathered form, and also on account of the rich fauna which that rock, and in particular its top or ‘Transition Bed,’ has here yielded.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 7 , July 1889 , pp. 296 - 305
Copyright
Copyright © Cambridge University Press 1889

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References

page 296 note 1 “Jack,” a quarryman's term for a bed of marlstone made up of an agglomeration of the shells of Rhynchonella tetrahedra and Terebratula punctata.

page 297 note 1 “On some Middle and Upper Lias Beds in the Neighbourhood of Banbury,” by Walford, Edwin A., F.G.S., Proc. Warwick Nat. and Arch. Field Club. 1878.Google Scholar

page 297 note 2 “Notes on Local Geology,“ by Thompson, B., F.G.S., part x. “The Junction Beds of the Middle and Upper Lias,” Journal Northants. Nat. Hist. Soc. vol. ii, p. 239, 1883.Google Scholar

page 298 note 1 As an illustration of the effect of atmospheric action in producing this change, it may be mentioned, that under the railway bridges where the Marlstone ballast has been protected from the rain, the rock remains in practically the same hard state as that in which it was first quarried.

page 298 note 2 We are indebted to Mr. B. Thompson, F.G.S., of Northampton, for the privilege of inspecting his collection, and also for the loan of some of the most interesting of the fossil here described.

page 299 note 1 Oppel was evidently mistaken in considering Turbo Patroclus, d'Orb., as the equivalent of Turbo subangulatus, Mü.

page 299 note 2 Figs, 1a, 1b, accurately represent this form, except that in Fig. 1a the shelly callus on the inner lip should have been shown to continue as far as the end of the posterior canal.

page 300 note 1 Geol. Mag. 12 II. Vol. IX. (1882), p. 11.Google Scholar

page 300 note 2 Pal. Soc. British Jurass. Gast. pt. i. p. 8, and p. 83.Google Scholar

page 301 note 1 As a general principle, no doubt, it is not safe to found a genus or even a species on a single specimen, and this prevents my giving a more precise diagnosis of Nortonia. In justification of the above genus-making however, it may be said, that the characters of N. Patroclus are exceedingly well defined, that our solitary specimen is apparently an adult shell, and is exceptionally well preserved, and that there is evidence of its maintaining its characters constant over a wide geographical area.

page 303 note 1 Journ. Northaots Nat. Hist. Soc. vol. ii. (1883) p. 296,Google Scholar pl. fig. 5.

page 304 note 1 “The Yorkshire Lias,” by Tate, & Blake, , p. 338,Google Scholar pl. x. fs. 7, 7a.