In this paper it has been shown that, in the Bath-Doulting district, there is no Inferior-Oolite deposit of pre- Garantianæ date. Consequently, there is a great non-sequence between the Inferior Oolite and the underlying beds. Expressed in terms of universal application, all the Aalenian and Bajocian beds are absent: the Bathonian rests non-sequentially upon the Toarcian, and in the immediate neighbourhood of the Mendips upon the Palæozoic rocks. In the hills south of the Avon Valley, at Bath, and as far as a line drawn east and west through Carnicote, near Timsbury, the Upper Trigonia -Grit rests upon the Midford Sands. South of this line, and between it and one similarly oriented about half a mile farther south, it rests upon the local Cephalopod-Bed—here of greater antiquity than the ‘Sands’ (Midford); not younger, as in the case of the Cotteswold Cephalopod-Bed. South of the latter line, the Upper Trigonia -Grit, often conglomeratic, rests upon the non-arenaceous Liassic deposits, until, in the more immediate neighbourhood of the Mendip Hills, it is overstepped by the Doulting Stone, which rests directly upon the well-planed, bored, and oyster-covered surface of the White Lias (Rhætic) and the Carboniferous Limestone-strata.In the valley between Egford Bridge and Broad Grove, Cloford, the Oolite rests in most places upon the Carboniferous Limestone, but sometimes—as the researches of that indefatigable geologist, Charles Moore, demonstrated—upon a thin deposit (only a few feet thick)representing a portion or the whole of the sediment laid down during the Rhmtic and Liassic Periods at those particular places.