VII.—Note on a further extension of the ‘Transition-bed’ and Crinoidal Limestone Band in the Middle Lias of Leicestershire

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Allusion has been made in a previous paper to the crinoidal limestone band and Transition bed at Billesdon Coplow, and to the existence of the former at Tilton Hill near Lowesby Station. At the latter place, though the Transition-bed is not exposed in situ, the position of the crinoidal limestone bed (after making full allowance for Drift deposits), is low enough, with beds normally horizontal or with a slight easterly dip, to adduce without any doubt the extension of the Transition-bed above it at this point. Thus the crinoidal limestone band had been traced at three points — Tilton (vide Wilson, ibid.), Billesdon Coplow, Tilton Hill—in the southern portion of the exposed area of the Rock-bed in Leicestershire, up to the time when the second paper, contributed by the author dealing with this bed in Leicestershire, was written. That is to say, it had only been found in the southern series of bold escarpments or spurs into which the district is divided. For the Twyford brook, running more or less west and east, divides the two series to which reference is directly made into a northern and a southern series, or if we include the Belvoir, Stathern, Eastwell, Holwell, and Waltham tract still more to the north, into three, with a central tract north of the Twyford brook.