The Lias in the vicinity of Lincoln is well exposed in the several brick-pits that lie at the foot of the “cliff” or in the steep slope beneath the escarpment of the Northampton Sand and Lincolnshire Oolite which go to form the cliff; the exposures however show us nothing below the Ammonites capricornus zone of the Lower Lias, the limestones and lower beds of this division lying several miles away to the west. The whole of the series, Upper, Middle, and Lower, is almost purely argillaceous, the usual sandy beds of the Middle and Lower Lias being entirely absent or only very feebly represented. The following is a description of the beds. Zone of:—