usually exceed from 10 to 15 feet in thickness, and pass upwards into or are succeeded by the Chillesford Clay. This sequence is well shown at Chillesford, where I had a trench dug in the upper pit by the church down to the Red Crag, so connecting it with the Stackyard pit. The general section thus taken is as under (fig. 18).
Fig. 18. — Section at Chillesford.
8. Light- coloured boulder-clay with a seam of broken shell-fragments at base. Grey clay with a few shells and fish-vertebrae, passing down into light-coloured clayey sand, with patches of perfect but friable shells.
3'. Yellow sands without sheila. part proved by digging.
The same with a few shells.
Seams of ferruginous sands with a few seams of clay and some shells.
Seams of comminuted shells.
Pebbly sand.
Light-brown and iron sand, with a greater variety and more perfect shells.
Beds of comminuted shells, with some entire ones.
The fossils of these Chillesford, or upper Red Crag, sands are often very few ; and some portion of them may in this district be derived from the destruction of the lower division, in the same way that in the lower division we find fossils derived from the Coralline Crag. At Chillesford-Church pit, however, we get the fossils proper and peculiar to these sands, as it is evidently the spot where they lived *. At Walton a thin seam of undeterminable shell-fragments occurs in places at the base of these sands. At Newbourne I could not distinguish between the few fossils of these sands and those in the beds beneath. At Chillesford Stack-pit Scrobicularia piperata is stated by Mr. Searles Wood to be found in the upper part of the
- For lists of these fossils see Quart. Journ. Geol. Soc. vol. v. p. 350, and
vol. xxii. p. 545 ; also the general list.
