Last year I described before the Society a series of flint implements of Upper Palaeolithic (Upper Mousterian-Aurignacian) facies discovered by me in Yorkshire at the base of, and passing up into, a deposit considered by Lamplugh to resemble a weathered Boulder clay and classed by him as of Late Glacial Age. The geological aspects of these archaeological finds I have dealt with fully in a paper read subsequently to the Prehistoric Society of East Anglia. Both papers, however, were complementary to one read by J.Reid Moir on archaeological discoveries of a similar nature made by him in north-west Norfolk in the Brown Boulder clay. With the objects of obtaining confirmation of Lamplugh's geological opinion and of bridging the gap between north-west Norfolk and Yorkshire, I decided to investigate the glacial sequence in north-east Lincolnshire, choosing Kirmington as a centre.