104 



REPORT UNITED STATES GEOLOGIC.iL SURVEY. 



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Mud spring. 



Mud pot. 



Boiling mud pot. 



Mud hole near No. 21. 



Turbid sulphur pool below No. 21. 



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Ravine above that of No. 23 on the river's 

 bank. 



a and b are on line of Assure back from No. 

 24 ; c is detached. "Water is milky-hued. 



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