432 N. H. DARTON — CATALOG OF PHOTOGRAPHS 



6^ by 82 inches 



1104. Gypsum in red beds, Hot Springs, Black hills, South Dakota (No. 473). 



1105. Jurassic sandstone on supposed Triassic red beds. 7 miles south of Hot 



Springs, Black hills, South Dakota (No. 474). 



1106. Cone-in-cone concretion in Pierre shale, southeast of Hot Springs, South 



Dakota (No. 472). 



1107. Granite needles near Harney peak, Black hills, South Dakota (No. 465). 



1108. Granite needles near Harney peak, Black hills, South Dakota (southern 



group) (No. 468). 



1109. Natural bridge in middle Jurassic sandstone near Buffalo gap, Black hills 



(No. 480). 



1110. Faulted middle Jurassic sandstone near Buffalo gap, Black hills (No. 479). 



1111. Cambrian sandstone on crystalline schists one mile north of Deadwood, 



South Dakota (No. 256). 



Photographed by C. D. Walcott 

 5 by 7 inches. Negatives in United States Geological Survey 



1112. View of pegmatite rocks- on Sylvan lake 6 miles north-northeast of Custer, 



Black hills (No. 405). 



1113. View of pegmatite rocks on Sylvan lake 6 miles north-northeast of Custer, 



Black hills (No. 406). 



1114. View of pegmatite rocks on Sylvan lake 6 miles north-northeast of Custer, 



Black hills (No. 408). 



1115. View from the summit of Harney peak, Black hills (No. 410). 



1116. View from the summit of Harney peak, Black hills (No. 412). 



Photographed by J. F. Kemp, Columbia University, New York, New York 



7 by 7 inches 



1117. Open cut in Father de Smet mine, Black hills of Dakota. 



1118. Old Abe cut, Lead City, Black hills. 



1119. Deadwood gulch, near Deadwood, Black hills. The near cliffs are phonolite. 



1120. Bear butte from Plain to South Black hills, a trachyte plug. 



Photographed by Grdbill Portrait Company, Chicago, Illinois 



1121. " Spearfish falls," Black hills. 



1122. " Needle point," Elk canyon, on Black Hills and Fort Pierre railroad. 



Photographed by Iowa Geological Survey 

 6J by 8-2- inches 



1123. Canyon in Sioux quartzite, new, taken from bottom, Dell rapids. 



1124. Cross-bedding in Sioux quartzite, Sioux Falls. 



1125. Palisades, showing Sioux quartzite on Split Rock creek, Minnehaha county 



1126. Palisades as in 1125; distant view. 



