JOURNAL OF Geology, Vol. XXX, No. 3 



Plate I 



EXPLANATION 



Late Tertiary 

 iedimentary roc 



I'y rocks 



Pre -Tertiary 



Igneous and 



metamorpliic rocks 



Fault 



Relief shading by J.H.Renshawe 

 lTOmdatasup,of,edbyauthor 



Reconnaissance map of the sreoloicy and topography of .Salton Basin and 



