The description of new sections of the junction between Cambrian and Pre-Cambrian rocks in Messrs. Boons quarry by Dr. Wills and Mr. Shotton in the November, 1934, issue of the Geological Magazine is of exceptional interest to me. I discovered the grano-phyric rock in 1932 and along with it the peculiar microdiorite which they describe, and have included description of both rocks and an analysis of the granophyre in a thesis recently submitted to London University.