184 



HISTORICAL GEOLOGY 



LEGEND 

 OCEANIC BASINS 

 MARINE WATERS (EPICONTINENTAL) 

 SEA OR LAND. MORE LIKELY SEA 

 LAND OR SEA MORE LIKELY LAND 

 LANDS 

 INDETERMINATE AREAS 



POLAR 



MARINE CURRENTS 



EQUATORIAL 



Fig. Ill 

 Paleogeographic map of North America during latest Paleozoic (Permian) 

 time. Outcrops of Permian strata are confined to the vertical and oblique- 

 lines areas, and in this way the map may also be regarded as a Permian 

 surface distribution map. (Slightly modified after Bailey Willis, courtesy 

 of The Journal of Geology.) 



