Relationships of Paleozoic Structures to Large Anomalies of Coastal Element of Eastern North America

摘要: ABSTRACT Studies of the coastal element eastern North America indicate that large structural anomalies have been influenced, or even controlled, by Paleozoic and older structures. Initially, in late Permian to Jurassic times, downfaulting downflexing continental margins, back generally parallel orogenic belts, effected unstable areas where sediments geosynclinal proportions accumulated Mesozoic Cenozoic. In United States, certain negative areas, for example, Rio Grande syncline, oppose salients Appalachian Ouachita belts. Some positive as Cape Fear arch, border recesses Others appear be related roughly belts cut across trends. Similar, but opposite relationships, exist between Sierra Madre Oriental folds larger structures Mexico. It is suggested they were positioned now mostly covered belt larger, modern, may used interpret, a very general way, patterns Offsets alignments geologic features, at south end Coahuila peninsula, along Champlain-Hudson valleys, suggest basement fracturing which controlled subsequent