III.—The Marsupites Chalk of Brighton

Abstract

A description on modern lines of the Brighton chalk below the (old) zone of Actinocamax quadratus is to be found in Dr. Rowe's “Coast Sections”, pt. i, p. 346. The principal points that he makes are that between Ovingdean Pumping Station and Black Rock the cliffs display below the (old) zone of A. quadratus a thickness of 58 feet of chalk, the whole of which, he assigns to his zone of Marsupites, and further to his Marsupites band as Uintacrinus was not found in it, but he notes that Uintacrinus has been found on the reefs. These points have, as far as I know, stood unchallenged hitherto, but I am unable to reconcile them with my experience.