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The accompanying geological map of South America is preliminary to a final colored map which will be prepared by The Geological Society of America with the corrections and modifications submitted by geologists acquainted with South America. Therefore it should have a wide distribution and much careful study by geologists with South American experience.

Each person or organization who has knowledge of geological conditions in South America is urged to study the accompanying preliminary map and to send in tracings of any corrections that should be made on the final map. Such corrections would include geological contacts, major faults, intercountry correlations, and corrections of the explanatory legend. They should be accompanied by a letter explaining the source and nature of the data upon which the correction is based for the use of the committee. All corrections should be sent to:

Mr. George W. Stose, United States Geological Survey, Washington 25, D. C.

The final map will be printed in the standard geological color system used in the geological map of North America. For the convenience of those who desire to color the preliminary map in an approximation of the final color scheme, the standard color system is as follows:

System   Color  
Quaternary   Brownish-yellow  
Tertiary   Yellow-ocher  
Cretaceous   Olive-green  
Jurassic   Blue-green  
Triassic   Greenish-blue  
Carboniferous   Blue shades  
Devonian   Blue gray  
Silurian   Blue purple  
Ordovician   Red purple  
Cambrian   Dull red  
Pre-Cambrian   Brown  
System   Color  
Quaternary   Brownish-yellow  
Tertiary   Yellow-ocher  
Cretaceous   Olive-green  
Jurassic   Blue-green  
Triassic   Greenish-blue  
Carboniferous   Blue shades  
Devonian   Blue gray  
Silurian   Blue purple  
Ordovician   Red purple  
Cambrian   Dull red  
Pre-Cambrian   Brown  

This preliminary map is a compilation of the contributions of the official geological surveys and organizations of the South American countries. It is . .

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