MESOZOIC OF SOUTHWESTERN OREGON 515 



Igneous and Met amorphic Rocks. 

 Associated with the Dillard series. 



General characters. 



The basic series. 



The greenstones 



The feldspathic granular rocks 



The ultrabasic rocks. 



The docite-andesite group. 



Glaucophane and associated schists. 

 Relations to the Myrtle group. 



General relations. 



General comparison with the Dillard. 



The Myrtle conglomerates. 



Other evidence. 

 Summary. 

 Economic Relations. 



Purpose of the discussion. 

 The Myrtle group. 

 The Dillard series. 



General contrast. 



Quartz veins. 



Effects of structure. 



Copper. 



Nickel. 



Chrome iron. 



Platinum. 



Limestone. 



Sandstone and cherts. 

 Areal Distribution in the Region Studied. 



General method of determination. 

 The interior quadrangles. 



General distribution in Roseburg quadrangle. 



The Dillard area. 



The Myrtle Creek area. 



Smaller areas between the Dillard and Myrtle Creek areas. 



Contrast between closedying areas of Dillard and Myrtle. 



The Days Creek area. 

 The coastal quadrangles. 



The Coos Bay quadrangle. 



The Port Orford quadrangle. 

 The Discontinuity of the Dillard and the Myrtle. 

 Comparison with the Standard California Type Formations. 

 The Myrtle group. 



Identity with the Shasta. 



