ILLUSTRATIONS 



Vll 



Crosby : 





Figure 



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Coleman : 





Figure 



1 1- 



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2 



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Gushing : 





Figure 



1 1- 



Walcott : 





Figure 



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-Contact broken by a fault with reversed flexure 149 



-Contact broken by a gravity fault 149 



-Contact broken by compensating thi'ust fault 149 



-Residuary hummock of the granite surface ■ 150 



-Residuary hummocks of the granite surface 150 



-Structure similar to figure 18 150 



-Erosion irregularity of the contact 151 



-Contact broken by a gravity fault. . 151 



-Contact broken by a thrust fault 151 



-Contact broken by a gravity fault 152 



-Probable oblique faulting and shearing of the contact 152 



-Small erosion scarp of the granite surface 152 



-Original depression of the granite surface 152 



-Contact broken by a thrust fault 153 



-Contact broken by a gravity fault 153 



-Overthrust flexure of the basal Cambrian beds in fourth 



outlier 153 



-East-west section of the contact in Williams canyon 154 



-Irregular erosion contact of the sandstone and gneissoid 



granite in Williams canyon 154 



-Original erosion hollow in the contact surface. 155 



-Grand Canyon section 157 



-Section of north side of Grand canyon 158 



-Section of Packsaddle mountain, Texas 158 



-Section of upper Narrows of Baraboo river, Wisconsin 159 



-Section on Black river, Wisconsin ......... 159 



-Diagrammatic sections 160 



-Map of Iroquois beach near Toronto 166 



-Curve of elevation of Iroquois beach 169 



-Section at Taylor's brickyard, Don valley 171 



-Section at Scarboro heights 172 



-Section in railroad cut near Loon lake. New York 179 



-Distribution of Belt terrane in Montana, as shown by shaded 

 area 205 



-Diagrammatic section showing relations between Cambrian 

 and Belt terrane 211 



-Unconformity between Helena limestone and Cambrian 

 sandstones 212 



-Unconformity between Marsh shale and Cambrian sand- 

 stone ' 212 



-Section showing unconformity between Algonkian and Cam- 

 brian formations in the Grand canyon of the Colorado. . . 214 



-Diagrammatic section from Signal hill. Saint Johns harbor, 

 Portugal cove, Conception bay - ■ . . 221 



-Sections showing deposition of Potsdam sandstone in Wis- 

 consin 225 



