A Delimitation of the Cenomanian:—being a Comparison of the Corresponding Beds in South-western England and Western France

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Abstract
1. Historical Introduction. The object of this paper is to compare the beds which form the lower part of the Upper Cretaceous series in those parts of Western France and Western England , which are nearest to one another. In England these beds are known by the names of Gault, Upper Greensand, and Lower Chalk; in France they are classed under d‘Orbigny‘s ‘Albien’ and ‘Cénomanien’ stages. It is well known that in both countries the deposits referable to these groups change their lithological character so greatly, in passing towards the west and south-west, that different observers have formed different opinions in their attempts to correlate one area with another. Further, no geologist has yet endeavoured to make a careful comparison of the French and English types; but it is only by such a comparison that the true stratigraphical position of d‘Orbigny‘s, Cénomanien stage can be determined, and that the limits of this stage in areas outside the typical Cénomanien district can be fixed. The name ‘Cénomanien’ was introduced by d‘Orbigny in 1847 to designate the lower part of the series which he had previously called ‘Turonien,’ when he found that this lower portion contained a fauna, essentially distinct from that of the upper part. He then proposed to retain the name ‘Turonien’ for the upper part, and to adopt the name ‘Cénomanien’ for the lower part, taking the name from Le Mans, in the Sarthe, the Cenomanum of the Romans,and regarding that district as the typical area of his new

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