The ridge of Jurassic land which lies to the west of Bourne in Lincolnshire, England, overlooks the town and the reclaimed fens to its east. This statement should not however, be allowed to give an impression of great altitude. This is a region of very gentle relief. The fen edge is at an altitude of about seven metres and 2½ kilometres away, the highest ground in the wood is at about 58 metres. The Jurassic beds (clay and sandy clay) are capped by glacial till or boulder clay, left from glaciations that occurred in the British Isles during the Anglian and Wolstonian stages respectively1. In former times, this till made the land too difficult for the early farmers to use as arable land and too wet and tenacious to be ideal for pasture. It is natural therefore, to find that much of it has been left as woodland, which was in itself, a valuable resource for fuel and constructional material. As far south as Bourne though, the remaining strip of glacial till is narrow and most of Bourne wood is on the Jurassic Kellaways clay and sand.