Meaning of Colors on Tecfonic Maps 

 (Plates 2-15) 



BLUE Denotes regions of accumulations of sediments. Contours indicate thickness of sediments and 

 thus, approximately, the amount of subsidence. Thickness figures indicate thousands of feet. 



GREEN Denotes ocean basins; i.e., regions underlain by oceanic crust. 



ORANGE Denotes significant deformation. Where sediments have been deformed during the period in 

 which they were deposited such has been printed on the blue. 



RED Denotes belts of batholithic intrusion and appreciable metamorphism on all Plates except 

 1, 14, and 15. On Plate 1 various intensities of red plus orange and yellow denote orogenic 

 belts of different ages. On Plates 14 and 15, red denotes igneous rock, chiefly volcanic. 



YELLOW Denotes regions of comparative stability of the earth's crust. It includes on some maps regions 

 of broad and gentle uplift (Plate 1 excepted). 



