The lower strata of the Inferior Oolite, near Cheltenham, and in other parts of Gloucestershire, present some features of novelty and interest, which I now proceed to lay before the Society; and this will form a conclusion to my previous paper on the superior Divisions of this Formation*. The bed immediately below the “shelly freestone” has been correctly termed Pisolite or Pea-grit in the ‘Geology of Cheltenham†,’ and is there described as being “made up of small flat concretions from a quarter to half an inch in diameter, which give it the appearance of a nummulitic rock.” At Leckhampton Hill it admits of the following subdivisions:— The same characters are presented by the Pisolite at Cleeve on the north-east, and at Crickley on the south, where it admists of the same subdivisions and contains identical fossils, although its average thickness is probably rather more*. South of Birdlip and along the more south-western range of the Cotswolds, the Pisolite disappears, but its absence is more than compensated for by the increased thickness of the Ammonitiferous oolite and inferior sands, the latter of which at Wotton-under-Edge are estimated by Mr. Lycett to be about 40 feet thick, and near Minchinhampton to average from 35 to 40 feet; while up the Chalford valley they are reduced (he says) to less than half that amount, and they probably thin out northwards where they are succeeded by the Pisolite. The next strata between the sands and the Pisolite, which constitute the lowest of the Inferior