Sep. 21 1924 Keith thinks the Middle Cambrian pinches out to the north. Clear the fusiliforms at Milton of the Highgate range is not in the Adams Pasture. This pinching out he thinks is due to overlap and not to faulting. The intervals of erosion between the different formations is usually of considerable time geologically. I don't if the St. Albans shale has half the thickness as at Rockliffe it has in Adams Pasture. It certainly is not present at Mr Highgate Falls. Therefore it has pinched out and probably before even in the Hungruford Brook area.