ILLUSTRATIONS V 



Page 



Plate 13 — Gilbert : Giant sand ripples (2 figures) 135 



14 — Crosby : Geological map of the Manitou embay ment 144 



15 " View in Ute pass, Colorado, looking south 146 



16 " View on road to Manitou grand cavern, Colorado 148 



17 " Eagle River canyon, Colorado 156 



IS " View in the Black hills. South Dakota 158 



19 — Gushing : Railroad cut in augite-syenite, Loon lake. New York 179 



20 " Banded gneiss included in augite-syenite 180 



21 — Tyrrell : Canadian Yukon district 193 



22 — W.^LCOTT : Dixon graphite mine 227 



23 ' ' Cryptozoon ? occidentale . 239 



24 " Annelid trails on Grayson shales 240 



25 " Crustacean remains from Grayson shales 241 



26 " Crustacean remains from Grayson shales 242 



27 " Belt, Avalon, and Grand Canyon terranes 243 



28 " Figures for comparison 244 



29— White : Relation of Grahamite fissure of Ritchie county, West 



Virginia, to Burning Springs-Eureka anticline 277 



30— Hayes : Map of region adjacent to Nicaragua Canal route 285 



31 " Geological sections of San Juan valley, Nicaragua 291 



32 " Geological sections in Nicaragua from the Cai'ibbean sea to 

 the Pacific ocean 309 



33 — Hall and Sakdeson: Eolian deposits in Minneapolis, Minnesota 



(3 figures) 351 



34 " " " Dune sand and modified drift at Pine City, 



Minnesota : 352 



35 — Kemp : Map of southern Connecticut and Rhode Island 361 



36 " Granite quarries in Rhode Island and Connecticut (2 figures). 366 



37 " Granite quarry at Leets island, Connecticut (2 figures) .. . 367 



38 " Photomicrograph of granite and gneiss (2 figures) 368 



.39 " Photomicrograph of orthoclase and basic inclusion in gran- 

 ite (2 figures) 371 



40 " Pegmatite veins and dikes and vein of biotite and garnet 

 (3 figures) 372 



41 '' Pegmatite dike and " Silex " mine (2 figures) 375 



42;— Dakton : Natural bridge in first canyon south of BuflFalo gap 391 



43 " Lakota sandstone and Unkpapa sandstone (2 figures) 392 



44 " Jurassic sandstone on red beds (2 figures) 393 



45 — Eastman : FJiolldophorus Americanus (3 figures) 408 



46 " Pholidophorus Americanus (2 figures) 408 



47 " FlioUdophorus Americanus {b 'Rgnres) 408 



48 " J ?)iio2ms.?drt)'^oniv' and an undetermined ganoid (3 figures). 408 



49 — Stevenson : James Hall 424 



50 ' ' James Hall 425 



51 — Dawson : Riviere Blanche landslip (2 figures) 485 



52 " Riviere Blanche landslip (2 figures) 488 



53 — Gulliver : Thames River terraces in Connecticut (2 figures) 493 



54 " Thames River terraces in Connecticut (2 figures) 493 



