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I.—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

Description.—Shell trigonal, thick; umbones large, angulated and terminal, ending in acute points, which curve downwards, forwards, and a little outwards; the sides of the shell, triangular in form, slightly excavated and highly inclined to the areas, are bounded by prominent carinæ, an acute carina separating the side from the slightly concave triangular area in front, and a more rounded carina separating it from the slightly convex triangular area behind. The valves are marked with strongly defined and somewhat sinuous subimbricating lines of growth at wide and fairly regular intervals, between which may be discerned numerous fine lines of growth. Lunule small and deep. Cardinal tooth elongated, oblique and prominent in the right valve, small and triangular in the left.

Type
Original Articles
Information
Geological Magazine , Volume 6 , Issue 8 , August 1889 , pp. 337 - 342
Copyright
Copyright © Cambridge University Press 1889

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References

page 339 note 1 The otherwise faithful drawing, Fig. 5a, should have fewer granules upon the interradial plates close to the basal plates.

page 340 note 1 “Der Jura,” p. 201, pl. 24, fs. 59–62, and pp. 246–7, pl. 34, fs. 2–5.

page 340 note 2 “The Yorkshire Lias,” p. 448.