Part I. D eposits. A: (a) The high tableland of the Cretaceous area of the Blackdown Hills and the summit of its outlying landmark, Haldon Hill, are capped by an accumulation of brown, yellowish, or grey clay full of broken unworn fragments of flint and chert. The clay rests alike on Chalk and Greensand in pipes*. Its character in Chalk districts is almost identical with that of the clay with flints in Kent; but near the westernmost extension of the Chalk (to the east of Sidmouth) the contained flints are seldom whole. In many places the matrix is thickly crowded with small flint chips and powder, giving it a grey colour and gritty texture, as on Haldon and Peak Hill, near Sidmouth. The clay with flints is confined to tableland areas : where the contour has been subsequently modified, it is only found on such heights as exhibit the original surface of the old plain from which they were isolated. The clay with flint and chert varies in thickness up to nearly 50 feet. That it has suffered from denuding agencies is testified by the presence of (β) Waterworn fragments of flint on its surface, bearing somewhat the same relation to the c]ay with flint and chert that is presented by the brick-earth to its representative in the south-eastern counties. This waterworn material is of very local occurrence on the Cretaceous tableland; upon Haldon it has been described by Mr. Godwin-Austen † and others. (γ) A patch of flint– and quartz-gravel