Thursday August 31-1983 Wea. MON. OCT. 18, 1909 Ther. Mr Smith of The Manor at Highgate sent a car forme and at 9.15 we leave St. Altans. At our 9.30 I am at the Donaldson road and I leave the car to spend the day be- tween here and Highgate. When the Corlin enyl. crosses the road from Highgate to N. a house. To the S of the house I made a tra- verse as follows; At road Corlin enyl. Then W. for 290 yards all in Highgate to study facing cliff, fence and low land beyond without exposures, in this distance there is an arch; for 230 yards from E. the dip appears true around 10°, then it turns and dips NW and at 290 yards orat if road dips around 60° W. At about 110 yards from road here in layer thin- kerm for 40-50' across. The casting dip if about 10° seems about 20° cast of Highgate road to E. of house at corner of road to Donaldsons farm W. At northern house 70 yards from road here is a second exposure of Corlin enyl. 11 yards across.