Vlli BULLETIN OP THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Plate 15 — Caibnes : The Ordovician-Silurian limestone : dolomite belt 339 



" 16 " Dissected character of the topography in areas of the 



Mesozoic beds 340 



" 17 " Erosion phenomena on a characteristic slate-phyllite 



side hill 342 



" 18 " Plateau surface in the limestone-dolomite belt where 



equiplanation is active 345 



" 19 — CuMiNGS : Development of the Monticuliporoids 3G7 



" 20 " Development of the Monticuliporoids 368 



" 21 " Development of the Monticuliporoids 369 



" 22 " Development of the Monticuliporoids 370 



" 23 — WooDwoBTH : Slickensided pebble and boulderet from Caney 



shales at Talihina, Oklahoma 459 



" 24 " Slickensided and striated Ordovician limestone 



fragments from Talihina, Oklahoma 461 



" 25 — Todd : Map of pre-Wisconsin channels in southeastern South Da- 

 kota and northeastern Nebraska 463 



" 26 " Pre-Wisconsin channels in northeastern Nebraska 465 



" 27 " Pre-Wisconsin channels in southeastern South Dakota... . 469 



" 28 — Blackwelder : Lower end of the Gros Ventre slide 487 



" 29 " Detail of the surface of the slide 488 



" 30 " One of the bulging domes, with crevasses 489 



" 31 " A closer view of crevasses, with dislocated sides. 490 



" 32 " Portion of the west edge of the earth-floor 491 



" 33 — Hershey : Glaciated stone from near Kingston, Idaho 517 



" 34 — Smith : Moraines in northwestern Alaska 563 



" 35 " Alatna River glacier and outwash plains of Noatak 



Valley 566 



" 36 " Topography in the vicinity of the Noatak canyon 569 



" 37 — Allen : Preliminary map of Pleistocene deposits of portions of 

 Glacier National Park and Blackfoot Indian Reserva- 

 tion, Montana 687 



" 38 " Pre-Wisconsin glacial material in Montana 691 



" 39 " Pre-Wisconsin glacial material in Montana 692 



** 40 " Pre-Wisconsin glacial material in Montana 700 



" 41 — Shimek : Sections showing mingling of Pleistocene formations. . 710 



" 42 — Keyes : Illustrations of plateau plains 715 



" 43 " Lucero type of plateau plain and rock-floor structure.. 717 



Figures 

 Shimek : 



Figure 1 — Map of Sioux Falls and vicinity 131 



OSBORN : 



Figure 1— Section from Hell Creek. Montana 233 



2 — Composite section. Cretaceous to Lower Eocene series.. 235 

 3 — Generalized section — typical Wind River series of west- 

 ern Wyoming 236 



" 4 — Generalized section — Lower Eocene of Big Horn Basin, 



western Wyoming 238 



