ILLUSTRATIONS. Vll 



Page. 

 D'Invilliers : Figure 1 — Map of the Island of Navassa, West Indies 76 



WiNCHELL : Figure 1 — Map of Part of the Huronian Kegion 88 



" " 2 — Section along Echo River and Lake and northward, 



showing Unconformity of Huronian and Kewatian 117 



" " 3 — View of rough Surface of Echo Lake Limestone 118 



Bell: Figure 1 — Section of brecciated Ore from Murray Mine 133 



" " 2 — Section of decomposed Ore from Murray Mine 134 



" " 3 — Hand Specimen of Ore from Stobie Mine 134 



Bell (Williams) : Figure 4 — Section of silicified -Glass-Breccia 139 



Hayes : Figure 1 — Yalley Rocks of Northwestern Georgia 143 



Dawson : Figure 1 — Sketch Section through the Selkirk Range, British 



Columbia 174 



Becker: Figure 1 — Broken Pestle from Auriferous Gravels. One-half natural 



size 193 



Pumpelly: Figure 1 — Section through Stamford Dike 212 



" " 2— Plan of Stamford Dike 212 



" " 3— Plan of Hoosac Mountain 213 



" " 4 — Section exposed by Mining on western Flank of Iron 

 Mountain, Missouri, showing Mantle of pre-Silurian 

 residuary Ore under Silurian Limestone 220 



WiNSLOW : Figure 1 — Generalized Cross Section from Poteau Mountains to Fay- 



etteville 227 



" " 2 — Cross-Section through the Poteau Mountains 228 



" " 3 — Cross-Section through the Washburn anticline 228 



" " 4 — Cross-Section through the Backbone anticline 229 



" " 5 — Cross-Section into the Boston Mountains 229 



" " 6 — Cross-Section into the Boston Mountains 229 



" " 7— Ideal Section of Arching Strata. First Stage 234 



" " 8 — Ideal Section of Arching Strata. Second Stage 234 



" " 9— Ideal Section of Arching Strata. Third Stage _, 234 



Williams : Figure 1 — Northern Section through the Piedmont Region in Mary- 

 land 312 



" " 2 — Central Section through the Piedmont. Region in Mary- 

 land 312 



