To the north of Tainton, near Burford, Oxon, the 500 O.D. contourline passes through the old quarry grounds where the wellknown Great Oolite freestone may be seen dipping at a high angle to the north-east. The bank falls 100 feet to the brook, 400 yards distant, where culvert and pipe trenches for new field waterworks have exposed what may be a continuation of a fault marked on the one-inch geological map of the Ordnance Survey as following the course of Coombe Brook, a mile to the north.