SUBTERRANEAN GEOLOGY OF SOUTH-EASTERN ENGLAND. 149
It is evident that the thinness of the Chalk at Ware, as compared
with the other places mentioned, is chiefly caused by the fact that the
boring was begun in the alluvium of a valley, the full local thickness
Fig. 3.—Deep Borings of S.E. England (thicknesses from Mr. H. B. Woodward's Geology of
England and Wales).
of the Chalk not having been obtained. At Harwich, some miles
north-east of the above localities, the Chalk was found to be 890 feet
thick, and at Chatham, on the south-east (Well No. 2 Chatham