x ILLUSTRATIONS. 
PiatE XL. Sections of Bonnybel, Durant, Aspen, and Late Acquisition mines___._._. ------ 
XLI. Sections of Pride of Aspen, Camp Bird, Iowa Chief, Mollie Gibson, and Smug- 
gler mines _..-.----.--.--------- -----------+--- =. ++ ---- 6+ +--+ ---------------- 
XLII. Sections of Smugeler, Della S., Bushwhacker, and Park-Regent mines___. -___.- 
XLIII. Sections of Park-Regent, Aspen Contact, Dubuque, and Little Annie mines ____ 
Fig. 1. Oxidized fine-grained dolomite, with residual areas ___.-..-.----------------------- 
9. Zones of reduction in oxidized fine-grained dolomite _.-_....-.-----.---- Ao) Am ata 
8. Nodule of lithographic dolomite in dolomitic sandstone -__. -.-_-..----------------- 
4, Sandstone veins in dolomite _--..-.-------------- CN Aas yh Galea eer spa aS aE NSC Eee SF en 
Be Mrachures ma Wie ela LiI eS tiO 110 see aera tee ohe 
6. Deformation of drift in Della S. mine, by movement along fault__-.._-----_..-.-_-- 
%, Diagram of Smuggler and Mollie Gibson ore bodies -.__._.-- --..----------------- 
8. Successive stages of faulting in Smuggler and Mollie Gibson mines______._--------- 
OM CTASSCEOSSIS 1) eee ee eee 
10. Microscopic fractures in granitic quartz -._____..___. -.-- .. .--. -------------.-----. 
11. Fossil changed to mative silver .---.-2.-2--.----------. ------ ===. ee 
