On the Lower Beds of the Upper Cretaceous Series in Lincolnshire and Yorkshire

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Abstract
Until recently no attempt had been made to describe the zonal divisions of the lower beds of the upper part, of the Cretaceous series in Lincolnshire. Indeed, Prof. Judd remarked in 1869, “The time has not yet come for separating the great mass of the Chalk formation in this county into zones, .... such a task not having been accomplished in the best-explored districts of the Chalk” *. In 1876 Dr. Charles Barrois†, having been unable to visit this county, follows, in his well-known work, the description given by Prof. Judd. It was not until the publication, in the spring of 1887, of the “Geology of part of East Lincolnshire,” a memoir of the Geological Survey, that a systematic attempt was made to correlate any part of the Chalk of Lincolnshire with that of the more southern counties of Cambridgeshire, Hertfordshire, &c. But the author of this memoir laboured under a disadvantage; for, as he remarks (p. 28), “The zones of the latter county [Cambridge] have not yet been traced northward into Norfolk, where the Chalk begins to put on what may be termed the northern or Lincolnshire facies; the data requisite for the proper correlation of the two areas are therefore incomplete.” And again (p. 31), “As yet we know nothing of the changes which the Chalk zones undergo in their passage from Cambridge to Norfolk; and in the absence of this connecting stratigraphical evidence, the correlations now suggested are not to be received as a decided expression of

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