Xll BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Davis : P ftge 



Figures 1 and 2— "The sequence of forms developed on faulted struc- 



tures . . . 193 



Figure 3 — Young faults in a mountainous district. 194 



. «« 4— Transverse faults in a monoclinal structure 205 



" 5 — An imaginary example of a resequent fault-line scarp.. . 212 

 Spencer: 



Figure 1 — Map of the triangulation of deformation measured in the 



Iroquois and Algonquin beaches 222 



Spencer : 



Figure 1 — Map showing effects of the Niagara limestone in the evo- 

 lution of the lake basins . 230 



Matthew : 



Figure 1 — Relations of homotaxial and synchronous stages in a 



widely dispersed phylum 289 



Paige: 



. Figure 1— ^Sketch map showing pre-Cambrian structure in northern 



Black Hills. ....... . 295 



....".. 2— Diagrammatic plan and cross-sections. jf»; . 298 



Watson and Gline : 



- Figure 1^-Geo logical map of middle western Virginia. 304 



u 2-^-Microscopic sketches of thin-sections of tesehenite illus- 

 trating occurrence of analcite. 319 



u 3 — Sketch showing abnormal twinning in hornblende of 



camptonite 323 



u 4r— Sketches illustrating zonal structure observed in horn- 

 blende of the camptonite ......> 324 



" 5 — Diagram illustrating kinship relations of dikes in north- 

 ern Augusta County, Virginia, on the basis of relative 



distribution 330 



Cushing : 



Figure 1 — Shale overlying lava on low point projecting from Starks 



Knob r 339 



" 2r^-Nearly vertical wedge of shale enclosed in lava of Starks 



Knob 340 



" 3 — Sketch of shale wedge enclosed in lava at the north end 



of Starks Knob » 340 



" 4— Diagram illustrating relation of lava and enclosing shales 



of Starks Knob 342 



Grab au : 



Figure 1 — Diagram of compound cross-bedding. .V 402 



" 2 — Diagram of complex bedding 404 



" 3 — Diagram showing the gradual eastward replacement of 

 the Trenton and higher limestones by shales of the 



Utica type 412 



r ..." 4 — Diagram showing the Bald Eagle delta deposits (sub- 

 aerial) on the east, replaced westwardly by Martins- 

 burg (Hudson) shales, which in turn merge westward 

 into and are replaced by limestones 431 



