882 



Subsurface Geologic Methods 



Figure 455. Paleotectonic map of Triassic. Black areas are erogenic belts; cross- 

 ruled areas are epeirogenic uplifts that were subjected to erosion; white areas 

 were covered by less than 1,000 feet of sediments; and stippled areas sank more 

 than 1,000 feet and received more than 1,000 feet of sediments. (From Eardley. 

 Reproduced permission Am. Assoc. Petroleum Geologists.) 



