The area to which this paper refers comprises that part of north Northamptonshire and Huntingdonshire lying to the east of the River Nene, not far from Oundle, 10 miles W.S.W. of Peterborough. It lies immediately east of the Northampton Ironstone Field, and is largely included in New Series, Sheet 171, and the adjacent parts of Sheets 157, 158, and 172 of the Geological Survey. The area was originally surveyed on the 1-inch scale by Judd (1875), and maps and memoirs published in 1872–6. Apart from the description of certain sections, notably by Beeby Thompson (1928, 1930) and Douglas and Arkell (1932), no subsequent work was done in this area until the Geological Survey commenced the primary 6-inch survey in 1939. During the progress of this work Survey Officers observed many structures which, by their relation to topography, were deduced to be of superficial origin. Hollingworth, Taylor, and Kellaway (1944, 1946) have given us a key to the interpretation of many puzzling features of structure and topography in the Jurassic scarplands, and it is their pioneer work which has made the present paper possible. In the area east of the Nene many of the types of structure described by those authors can be observed; there are, in addition, other structures which appear to be of similar origin, and which it is now desired to place on record.