Walton (fig. 12), where a bed of unproductive sands overlies the shelly beds, and subtends them on to the London clay in a direction from N. to S.
In the railway-cutting between Woodbridge and Martlesham, this upper division is more developed, and the lower division presents a slightly eroded surface (fig. 13).
Fig. 13. — Section in Railway-cutting south of Woodbridge.
a. White sand and gravel, 3 feet.
3'. Upper Red Crag, yellow sands with a few patches of shells at base, 15 feet.
2. Lower Red Crag, shelly, 12 feet. l. London Clay.
The erosion of the lower division now becomes marked both to the eastward and northward of this place. Some well-marked instances may be seen in the cliff at Bawdsey (fig. 14), and again at Shottisham (fig. 15).
Fig. 14. — Section in Bawdsey Cliff.
Part of upper division; ochreous sand with few shells.
Part of lower divison, with shells more numerous, and ferruginous.
