[21] Though the valley is full of clay the road avoids it with
remarkable success. Of the eight miles between Alton and Farnham the
first three have chosen a narrow strip of good gravel, the next one
and a half miles are on green-sand. At the entry to Bentley village
the clay is unavoidable, but after a mile of it the road takes
advantage of a patch of gravel as far as the Bull Inn. It has then to
cross a quarter-mile belt of gault, but beyond this it uses a long,
irregular, and narrow patch of gravel, and at the end of this, just
east of the county boundary, it finds the narrow belt of sand which it
keeps to all the way to Farnham. The whole is an example of how a
primitive track will avoid bad soil.
[22] This field is marked 37 in the 1/2500-inch Ordnance Map for
Surrey, l. xxxi.