Deposition of Cretaceous and Tertiary Sediments in the Eastern Mississippi Salt Basin (With Emphasis on the Richton Dome Area): Volume 2, Plates

摘要

Regional structure-contour and isochore maps were constructed for selected Cretaceous and Tertiary lithostratigraphic units in the eastern half of the basin. Analysis of the isochore maps suggests that 70 to 80% of the sediment deposited within the basin during the Cretaceous Period was accompanied by subsidence of the continental margin; the remaining 20 to 30% was accompanied by subsidence of the Mississippi Salt Basin. As the continental margin reached isostatic equilibrium during the Tertiary, less sediment was deposited and thus was accompanied by less regional subsidence. Maximum depositional rates occurred during periods of delta building, and minimum rates occurred during periods of shallow marine deposition. Structure-contour and isochore maps were also constructed for a 1400-mi sup 2 (3500-km sup 2 ) area in the vicinity of Richton Dome to illustrate the effects of local salt withdrawal on the sedimentation patterns. This volume contains only maps. (ERA citation 13:014220)