St Albans July 7 - 1952. Friday Studied the highly seasonally bandled slates beside the road up the hill from South Green School, 1/4 mile N.E. of Rock Run. This is about 3 miles N.E. of Highgate Center. Sales measured a number of places to show the varps. I gathered a bag full of specimens to show the wonderful detail of this banding. Sales pointed out the prominent bands at the tip of the dark part, but often the dark portion is again crudely banded. As many as seven of the lighter layers in a space of 3/8 inch of the dark portion of a varp. This material should give a good rate of sedimentation for each year. The finer banding in the black portion is thought to be due rather to heavy rains during the year, than to seasonal rate of mud supply. The formation is thought by Blick to be Highgate slate, but he is not certain. It has the lay of Highgate and probably is. First in the afternoon revisited the rail-road cut near Highgate Center to count the varps in the imbricate limestone. Took away two samples. The thickness of the limestone that one could count is