REPORT OF THE CHIEF ASTRONOMER 



561 



SESSIONAL PAPER No. 25a 



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Middle California. 



Local vulcanism. 

 Glaciation. 



Local vulcanism. 

 Fresh-water sedimen- 

 tation. 



Coastal marine sedi- 

 mentation. 



Fresh-water sedimen- 

 tation. 



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Oregon and 

 North- 

 ern California. 



Local vulcanism. 

 Glaciation. 



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Coastal marine 

 sedimentation. 



Fresh-water sedi- 

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Central Washing- 

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Local vulcanism. 

 Glaciation. 



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Vulcanism. 



Batholithic intru- 

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(Orogenic disturb- 

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Fresh- water sedi- 

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Vulcanism ? 

 Fresh- water sedi- 

 mentation. 



Coastal marine sedi- 

 mentation. 



Fresh-water sedi- 

 mentation with 

 vulcanism. 



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Western 



Geosynolinal 



Belt, 49th 



Parallel. 



Local vulcanism . 

 Glaciation. 





Vulcanism. 

 Batholithic intru- 

 sion. 



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Vulcanism. 

 Fresh-water sedi- 

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Western British 



Columbia and 



Yukon. 



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Fresh-water s e d i- 

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Vulcanism . 

 Fresh-water sedi- 



mentation. 

 Vulcanism. 



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Southeastern 

 Alaska. 



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Fresh-water and 

 marine (?) sedimen- 

 tation . 



Fresh-water and 

 marine (?) sedimen- 

 tation . 



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