VI 



BULLKTIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Figures 

 Lane : 



Figure 1— Douglas- Hough ton ravine, Keeweenaw point 

 Fairchild : 



Figure 1 

 Gulliver: 



Figure 1 

 2 



Page 

 13 



-Hyi)er-Iroquois channels 54 



4- 

 5- 



6- 



7- 

 8- 

 Gilbert : 



Fissure 1- 



" 



5- 



• " 



6- 



u 



7- 



Gilbert : 





Figure 



1- 



" 



2- 



Gilbert : 





Figure 



1- 



(( 



2- 



" , 



8- 



If 



4^ 



Crosby 



Figure 1- 



" 2- 



3- 



4- 



" 5- 



Drainage system of Ural mountains 72 



Chafranowa section 74 



Diagrammatic section of the Urals 75 



Section at Ufa 80 



•Simsk grade-plains 80 



•Profile near Ust-Kataw 81 



•Yurezusk grade-plains 81 



-Taganai section 82 



Peojile and section in western New York from the Cornifer- 



ous terrace to lake Ontario . . 1 23 



2 — Map of Niagara limestone and escarpment 123 



3 — Typical peoples of the Niagara escarpment . . 124 



-Contour on the Niagara limestone at the Niagara escarpment. 125 



-Plan of the northern boundaries of resistant ledges 126 



-Drainage map in western New York 127 



-Diagrammatic section of glacial furrow and ridges ... 128 



-Sketch map of Thirty mile Point 132 



-Section at Thirtymile Point 133 



-Section of prism of sandstone 136 



-Typical peoples of sand-ripples 136 



-Cross-bedding produced by slow shifting of ripi)le system 



during deposition . 139 



-Compound cross-bedding produced by deposition and partial 



erosion associated with shifting sand-ripples 139 



-Comj>lex cross-bedding and unconformities associated with 



ripples 140 



-Cambrian sandstone in Williams canyon, Colorado . . 142 



-Carboniferous conglomerate, Nautasket, Massachusetts.'. . . . 142 



-Contact broken by a gravity fault 146 



-Contact broken by a thrust fault 146 



-Overthrust flexure of basal Cambrian beds on east side of 



Ute pass 146 



6 — Faulting and shearing of the contact 147 



7 — Erosion irregularity of the contact 147 



8 — Residuary hummock of the granite surface 147 



9 — Irregular contact broken b}' a fault 147 



10 — Contact modified bj' a thrust fault and flexure 148 



11 — Angular erosion irregularity of the contact 148 



12 — Slight erosion irregularity of the contact 148 



13 — Contact broken by a gravity fai;lt , 148 



