450 



STRUCTURAL GEOLOGY OF NORTH AMERICA 



SEDIMENTARY ROCKS 

 REVNOSA fe-^-d MtNOEZ k yX T^ SAN T ELIPeEHtaMAULIPAS 



□ i 



IGNEOUS ROCKS 





SIERRA DE SAN JOSE 



TUNA MANSA 



ANTICLINE 



T 



1000 



2000 SOUTHWEST 



1000 A t 



HUAHUIRAN-OJO 



DE ACUA 

 LINE OF FOLDING 



EL MULATO 



Inortmeast 



CERRO OIENTE 



CIRRO JATERO 

 \ 



3000 



,ooo SOUTHWEST 



1000 C g . t ^ _>,-- ' '.\\ ' -;t 



CERRO CUERO DURO- 



SACRAMENTO TAMAULIPECA HUAHUIRAN-OJO 



TUNA MANSA 1 AURELIS STRUCTURE OE AGUA 



ANTICLINE I LINE OF FOLDING I LINE OF FOLDING 



CERRO CORCOVADO 



CRtll L L A S 



3000 



looo SOUTHWEST 

 iooo E 



NORTHEAST 

 .F 



Fig. 28.8. Cross sections of the San Carlos Mountains, Tamaulipas, Mexico. Reproduced from Kellum, 1937. 



OROGENIC HISTORY 



In review of the orogenic history of northeastern Mexico, it has been 

 concluded that the late Paleozoic belt of folding and thrusting of the 

 Marathons of western Texas curved southward and probably extended 

 into the site of and formed the later Coahuila peninsula. From the south- 

 ern part of the peninsula, the late Paleozoic orogen turned eastward to 



Monterey, according to Humphrey ( 1947 ) and then south-southwesterly 

 for a long, but unknown, distance. It seems doubtful that the orogenic 

 belt could have endured throughout more than early Mesozoic time, 

 when epeirogenic movements may have rejuvenated segments of it which 

 served as barriers to marine invasions from the Gulf region. The Mexican 

 geosyncline developed in Jurassic and Cretaceous time on the western 

 and southern (foreland) sides of the Paleozoic belt, but sedimentation 



