EXCURSION TO \VORCESTER PARK AND . SATURDAY, APRIL 29TH, 1922. REPORT BY ARTHL'R WRIGLEY, Director of the Excursion. A LARGE party visited the pit near Coldharbour Farm, worked by the 'Worcester Park Brick Co. Here an extensive excavation, over 50 feet deep, exposes stiff, grey Clay with septaria at an horizon estimated to be about 250 feet above the Base­ ment Bed. After a description of the fossil mollusca which have been found here, and an interval for collecting, the party walked to New Malden, to examine the pit of the Norbiton Potteries Ltd., in Blagdon Road. This presents another large and deep section of London Clay. Proximity to the Fault makes it difficult to estimate exactly the horizon of this section, but from the fossils which occur it appears to lie in the upper third of the London Clay. Here most members were successful in obtaining some specimens. At New Malden, l\Ir. E. A. Turner, F.G.S., gave an account of the local drift and has furnished the following abstract of his remarks: " The situation of this pit is interesting, lying as it does in the New Malden abandoned valley, once occupied, it is considered, by the River Mole, which, instead of uniting with the Thames at Molesey, joined the Wandle in the neighbourhood of .* " The valley is floored with deposits of sand and sandy gravel, having a thickness near Merton Church of from 16 to 20 feet, and a surface level of between 40 and 50 feet O.D. To the north the ground rises comparatively steeply to the plateau of Wimbledon Common and Kingston Hill (170-180 feet O.D.), and on the south much more gently to the Chalk outcrop at Sutton and . " The valley of the makes a notch on the north side, through which most of the drainage of the area now finds outlet."

• See" Geology of :' M,m. Gcol, Surv•• 1921, p. 68.