- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
A study of the planktonic foraminifera that occur in the valley of St. Ann's Great River has yielded results that change the previously assigned ages for some of the beds in this inlier. The Inoceramus beds range from late Coniacian to late Santonian. The base of the Campanian is at the base of the conglomerate below the Barriettia limestone. At least the upper part of the New Ground Conglomerate is Eocene in age.