Summary traits of southern Appalachian orogen

Some major components (described from foreland to the west to hinterland to the east): Map from USGS shows some of these major divisions and the distinction between the Northern and Southern Appalachians, with New York City close to the switch over location. One questions that can be asked is what in the geologic history led to the difference between the northern and southern sections. We are focusing on the Southern Appalachians simply because I know it a bit better.

Valley and Ridge province of the Appalachians outlined by two white lines in the USGS Tapestry Map, Image source: .

This is a shaded relief DEM image taked from the NASA Visible earth site . See if from the description you can pick out the following: anticlines and possiple thrusts in the Valley and Ridge, the approximate contact between the Valley and Ridge, the Brevard zone. The land surface as a geologic signature simply because erosion selectively etches into the underlying geologic structure.


Some major events:

Map showing two of the better exposed, studied and known Triassic grabens in the Appalachians - the Newark and Connecticutt River basins. More basins lie buried underneath the Coastal Plain Province. This rifting started perhaps some 50-60 millions after the Alleghanian deformation stopped - not along time. Image source: .

Penetration of Appalachian strain and fluids into the continent.


Select references:

Course materials for Plate Tectonics, GEOL 3700, University of Nebraska at Omaha. Instructor: H. D. Maher Jr., copyright. This material may be used for non-profit educational purposes with appropriate attribution of authorship. Otherwise please contact author.