12 at the time with an average ambient temperature of well below freezing. At the very top there is a layer of find wind—blown silt (brickearth) which was deposited around 10,000 years ago. The beds overlying the Crag have, in the past, yielded bones of mammoth, elephant and hippo together with deer antlers. Flints supposedly fashioned by early man have also been found. It is hoped that collecting will still be possible at this site for many years to come despite pressure on the authorities to extend coastal defences further north along the Naze. The current rate of erosion is very rapid and as a testimony to this, a concrete block house built some distance from the cliff edge during World War II can now be seen lying on the beach. Walton is always a favourits site for collectors but this is probably as much due to the mild weather, the pleasant beach and the ice cream parlour than it is to the fossils! GERALD LUCY Secretary of the Essex Rock and Mineral Society (Since this article was written the Waltonian Red Crag has been re-classified by geologists and now appears under the Pliocene period.) If you have found this article interesting why not come along to Mr. Graham Ward's talk on the Geology of Essex on 30th March, 1990. Tele- phone David Turner for details on 0245 267450.