The following communication is intended as a supplement to a paper read before the Society by one of the authors in 1883 (Quart. Journ. Geol. Soc. vol. xxxix. p. 348), and the two together form an amplification of an article on the same subject by Mr. W. H. Herrics (Geol. Mag. dec. ii. vol. viii. p. 171). In our last paper we devoted our attention almost entirely to the Upper and Middle Divisions of the Bagshot series. We now propose to treat more fully of the Lower Division, and to show that the occurrence of pebble-beds is by no means confined to one horizon in the Bagshot series, as would seem to be supposed by some observers. In the interval much has been written about the geology of the Bagshot district, no less than five papers by the Rev. A. Irving, and one by Mr. Hudleston, having appeared. The views lately advanced by Mr. Irving are very much at variance with the hitherto accepted interpretation of the geology of this district, and to a great extent we find ourselves compelled to differ from him. He considers (Quart. Journ. Geol. Soc. vol. xli. pp. 506, 507) that the Upper and Middle Bagshot beds, in some places, overlap the Lower Bagshot Beds, and rest directly on the London Clay, which had been thrown into a slight syncline previous to the deposition of the Lower Bagshot strata. He founds his argument partly on the relative thicknesses of the Lower Bagshot beds and the
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