Vlll BULLETIN OF THE GKOLOGICAL SOCIETY OF AMERICA 



Hayes : Page 



Figure 1 — Basins of the Rio Grande and Rio Las Lajas 338 



Hall and Sardeson : 



Figure 1 — Section of glacial and postglacial deposits 356 



" 2 — Section from edge of Mississippi River gorge across ancient 



channel bed 3(i0 



Darton: 



Figure 1 — Outline map of Black hills 384 



" 2 — Outline of history of Jurassic deposition in Black Hills re- 

 gion 395 



Eastman : 



Figure 1 — Head of the so-called Isopholis ( Ophiopsis) muensteri Wagner. . . 400 



" 2 — Head of PhoUdophorus macrocephalus Ag 401 



Hopkins : 



Figure 1 — Location of the Conshohocken plastic clays of Montgomery 



county, Pennsylvania 483 



Dawson : 



Figure 1 — Sketch-plan showing area of landslip (horizontal lining), 

 part of clay-filled river- valley (vertical lining), and ap- 

 proximate boundary of an ancient landslip of the same 

 kind 486 



(54 plates; 83 figures.) 



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