In some places it will be a most clay and in still another sandy, in still other places there are considerable quartz pebbles not much rolled but rather as the cones rounded. In this sands it is a fluviatile deposit from coming off a county of metamorphic rocks. In general the sequence seems to be as follows: Towards the close or at the close of the jurassic the eastern shore of North America was probably a low lying land with elevations not exceeding 100 feet and without any deeply cut river courses as the present Delaware, Susquehanna etc. The land was depressed some and a very shallow sea made its appearance depositing a basal zone of well washed angular sands with well rounded pebbles. Above this shallow sea was filled up or that while in places one had sand was deposited in other areas, these lagoons or rather deltas was deposits fluviatile deposits of mud and various alut clays. This condition became general during the Patapsco when only con- tinental deposits occur. Now a second shallow sea invades in places more persistent than in other but nowhere are there any true marine deposits laid down. This is the Raritan a Plastic clay of the Cretaceous. A third and decided out-