Present position of the former topographic surface of Appalachia (from seismic evidence)

Abstract

The foregoing paper by Professor Nelson [see 1 of “References” at end of paper] has traced the evolution of the sub‐Cretaceous land‐surface of Appalachia and has cited the geologic evidence indicative of both the rate of (seaward) slope, and the nature of the topographic relief characterizing this former continental surface. In the present paper, I will present a geophysical continuation of Dr. Nelson's geologic story and will describe how the seismic method of geophysical exploration has been, and may be, used in the further mapping of the buried Appalachian land‐surface— both within the area of the present Atlantic Coastal Plain, and within the western part of the Atlantic. Seismic explorations within these areas have not, it is true, as yet passed beyond the reconnaissance‐stage; but, even so, the results already obtained have led to positive conclusions and have justified the formulation of much more extensive exploratory projects. The latter are even now getting under way, and presage both extensive and intensive seismic exploration of coastal areas from New England to Florida.