SOUTH DAKOTA 431 



1073. Big Bad lands ; south end of Sheep mountain from the southeast ; volcanic 



ash bed near top ; Washington county (No. 380). 



1074. Protoceras sandstone on Oreodon beds 2 miles east of mouth of Wounded 



Knee creek ; looking east ; Washington county (No. 385). 



1075. Protoceras sandstone area, Big Bad lands (No. 519). 



1076. Protoceras sandstone area, Big Bad lands (No. 520). 



1077. Protoceras sandstone area, Big Bad lands (No. 522). 



1078. Protoceras sandstone area, Big Bad lands (No. 523). 



1079. Protoceras sandstone area, Big Bad lands (No. 524). 



1080. Natural bridge, Protoceras sandstone area, Big Bad lands (No. 526). 



1081. Protoceras sandstone area, Big Bad lands (No. 531). 



1082. Big Bad lands of South Dakota, in the vicinity of the Flour trail ; looking 



north (No. 506). 



1083. Looking west over portion of Big Bad lands near Flour trail (No. 507). 



1084. Looking west over portion of Big Bad lands from near Flour trail (No. 509). 



1085. Looking southwest over a portion of Big Bad lands near Flour trail (No. 510). 



1086. Sandstone lenses near Flour trail, Big Bad lands (No. 515). 



1087. Columns of clay capped by sandstone near Flour trail, Big Bad lands (No. 517). 



1088. Looking down head of South fork of Coral draw, Big Bad lands (No. 532). 



1089. Big Bad lands in the vicinity of Flour trail, looking west (No. 536). 



8 by 10 inches 



1090. Big Bad lands of South Dakota, east side of Cedar draw, Washington county 



Columns capped by sandstone, White River formation (No. 637). 



1091. Big Bad lands of South Dakota, head of Cedar draw. Erosion forms in 



Titanotherium sands (No. 643). 



1092. Big Bad lands of South Dakota, east side of Cedar draw. Columns of sandy 



clay capped by sandstone (No. 648). 



1093. Bis Bad lands of South Dakota. A portion of the divide between Battle 



draw and Cedar draw. Oreodon beds of White River formation (No. 647). 



1094. Big Bad lands of South Dakota, looking across head of Battle draw, Washing- 



ton county. Titanotherium beds in middle-ground, overlain by Oreodon 

 beds on the higher slopes. Late afternoon view (No. 642). 



1095. Fossil tree in lower Cretaceous sandstone southwest of Minnekahta station, 



Southern Black hills (No. 673). 



1096. Thermal spring at Cascade springs, Black hills (No. 672). 



1097. Granite needles near Harney peak, Black hills (No. 618). 



1098. Granite needles near Harney peak, Black hills, near view; Telephoto (No. 



619). 



1099. " Hogbacks" of Dakota sandstone on south side of Buffalo gap, Black hills, 



looking southwest (No. 622). 



1100. Grindstone quarry in Dakota sandstone north of Edgemont. southern mar- 



gin of Black hills uplift (No. 670). 



1101. Sandstone dike, southeast of Maitland, in Benton shales (No. 754). 



1102. Beecher rocks. Erosion in pegmatite, south of Custer (No. 746). 



1103. Oligocene cross-bedded gravel in railroad cut south of Fairburn (No. 780). 



