<P> Foreland basins are a product of tectonic deformational loading, or crustal thickening along the orogen, a consequence of overthrusting and folding . The Acadian foreland basin is categorized as a retroarc foreland basin, which occurs on the overriding continental lithosphere, adjacent to a foreland fold - thrust belt behind a continental margin arc . The initial result of loading is a bulge move out and uplift of the foreland, which generates a localized unconformity . The distributions of unconformities display an asymmetric pattern in relation to the promontories . Subsidence follows bulge movement and uplift, and is produced on the cratonic side of the orogen due to regional isostatic adjustment to the load by the lithosphere . Once thrust propagation declines, substantial relief and drainage nets have had time to develop, and the as a resulting coarser clastic sediment is eroded and transported to the foreland basin . </P> <P> The basement structures of the Appalachian foreland basin at the onset of the Acadian orogeny were reactivated during foreland lithospheric flexure . These structures affected the foreland basin evolution and sedimentation patterns, and the preexisting faults partitioned the basin into regions of fault - controlled uplift and depocenters . </P> <P> The Appalachian basin, during the Middle Devonian and Early Mississippian, is characterized by large volumes of deltaic sedimentary rocks that were deposited in the Acadian foreland basin as a response to the Acadian orogeny . These deposits extend from central New York and Pennsylvania westward to Ohio, and south along the Appalachian Mountains through Virginia and Tennessee to Alabama . The Acadian delta complex is categorized into two deltas, the Catskill Delta of Middle and Upper Devonian age, and the Price - Rockwell (Pocono) delta of Late Devonian and Early Mississippian age . The Acadian delta complex is coupled to the four tectophases of the Acadian orogeny, both in terms of provenance and depositional settings . The relief resulting from the orogeny was the fundamental source of the delta sediments . </P> <P> The Catskill Delta complex consists of a coarsening upward sequence of rocks . Its thickness is greatest in eastern Pennsylvania and thins westward into Ohio . The Catskill paleogeography appears to consist of many small streams, which deposited their sedimentary load along a coastal alluvial plain that was hundreds of miles long . </P>

Which deltaic complex in north america originated as a result of the taconic (acadian) orogeny