VI BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Plate 23 — Clark and Bibbins: Distribution of the formations of the Potomac 



group in Maryland 188 



" 24 " " " Patuxent formation (2 figures) 191 



" 25 " " " Arundel formation 195 



"26 " " " Patapsco formation (2 figures) 200 



" 27 " " " Raritan formation (2 figures) 202 



" 28 " " " Fossils from Patuxent and Arundel formations 



(2 figures) 212 



" 29— Clark and Martin : Distribution of the Coal Measures of Maryland. 215 

 "30 " " " Top of upper Connoquenessing sandstone at 



Swallow falls, Youghiogheny river, Pottsville 



formation 218 



11 31 " " " Columnar sections of the Pottsville formation.. 219 



" 32 " " " Pottsville formation (2 figures) 220 



" 33 " " " Columnar sections of the Allegheny formation. 221 



" 34 " " " Allegheny formation (2 figures) 222 



" 35 " " " Columnar section of the Conemaugh formation. 223 



" 36 " " " Conemaugh formation (2 figures) 225 



"37 " " " Sections of the Monongahela formation 226 



" 38 " " " Monongahela and Dunkard formations (2 fig- 

 ures) , .... 228 



" 39 " " " Columnar sections of the Dunkard formation. . 230 



" 40 — Schrader: Geological reconnaissance section of the Rocky moun- 

 tains in northern Alaska from Koyukuk river (latitude 



66°) to the Arctic coast (latitude 70° 30") 233 



" 41 Edge of A naktoovuk plateau and base of Ei\dicott range. 235 



" 42 Endicott plateau and Endicott mountains carved from it. 236 



" 43 " Colville river and bluffs 249 



" 44 — Keyes : Devonian section of the Mississippi valley 267 



" 45— Coleman : West end, Boyer lake, Helen mine. 293 



" 46 — Willis : Mount Gould, Lewis range 305 



" 47 " Margin of Great plains and north side of Swift Current 



valley 311 



" 48 " Map of Great plains and Front ranges, northwest Montana. 313 



" 49 Goathaunt, Lewis range 323 



" 50 Panorama from Swift Current pass and view in Livingston 



range (2 figures) 330 



" 51 Panorama from Swift Current pass and foothills of Chief 



mountain (2 figures) 331 



"52 Chief mountain, Lewis range (2 figures) 331 



" 53 Geological sections (5 figures) 338 



" 54— Watson : Copper mines, Person county, North Carolina (2 figures) . . 353 

 " 55 High Hill copper mines, Halifax county, Virginia (2 



figures) 358 



"56 Copper mines, Person county, North Carolina (2 figures). 363 



" 57 — Adams : Portrait of George M. Dawson 497 



" 58 — Turner: Section across bed of the Neocene Tuolumme river, on 



west side of Piute canyon. . . , 541 



