On the Subdivisions of the Chalk of Trimingham (Norfolk).

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Abstract
The Chalk in question is seen on the sea-shore when freed from shingle and sands by favourable tides, and portions of it rise as bluffs in the more recent deposits of the cliffs, being exposed from time to time as these beds in their turn are denuded away. This Chalk, by the evidence of its fossil contents, is younger than the Chalk of the mucronata -zone, which is the highest member of the White Chalk exposed elsewhere in England. This mucronata -Chalk dips generally eastwards, and, although exposed between Weybourne and Cromer, disappears just east of the latter place and is seen no more. The Chalk described in this paper lies on the top of mucronata -Chalk, and is correlated by its fossil-contents with the Chalk of Rügen. It is, therefore, in normal succession to the mucronata -Chalk, and represents the highest beds of the Cretaceous System existing in this country. It has not been found in any other part of the British Islands. The literature on it is scanty, and for present purposes it will be useful to call attention to Mr. Clement Reid's ‘Geology of the Country around Cromer’ Mem. Geol. Surv. 1882; to the present writer's ‘Stratigraphy & Fauna of the Trimingham Chalk,’ 8vo, London (Dulau) 1900, and Geol. Mag. 1906, which gives a complete fauna of these beds and of the mucronata -Chalk between Weybourne and Cromer; also to Mr. A. J. Jukes-Browne's ‘Upper Chalk of England,’ vol. iii of the ‘Cretaceous Rocks of Britain’ Mem. Geol. Surv. 1904. In a

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