UPPER RED BEDS OF THE BLACK HILLS 369 



Feet. Inches. 



Covered to lower contact. 



At contact red, clayey sandstone with minute specks of glistening 

 quartz. 



Purple limestone (Permian). 



II. THREE-FOURTHS OF A MILE UP COLD BROOK FROM HOT SPRINGS. 



Massive buff sandstone (Jurassic). 



Rather coarse dark brick-red sandstone with few streaks of green 



clay ----------- 20+ 



Concealed. 



Mottled gypsum (admixture of red clay) ----- 4 



Reddish sands with thin green streaks - - - - - . . 8 



White gypsum .----..-. . . 2 

 Rather coherent bright red sandy shale with few small green 



specks .-.-.----- 2$-\- 



Concealed. 



Red sandy clay. 



(Abrupt change.) 



Massive pure white gypsum - - - - - - - 18 



Light red clayey sandstone with network of wafer-thin gypsum 



veins - - - - - - - - - - -10 



Massive white gypsum -------- 8 



Red sandy clay -..-.-..- 2 



Massive white gypsum -------- 20 



Red sandy clay --------- 40+ 



Lower contact covered. 



III. HEAD OF SHEPS CANYON, EAST OF CASCADE SPRINGS. 



Massive yellowish sandstone with few small basal pebbles of 



quartz (Jurassic) - - - . - . . . 30-40 



Erosional unconformity. 



Massive chocolate-brown, sandy shale ----- 30-I- 



Dark brown-red clayey sandstone with green clay streaks, not 



continuous, and thin interlacing gypsum veins - - - 30-)- 



IV. CANYON NORTHEAST OF CASCADE SPRINGS. 



Alternating red sandy shales and gypsum of undetermined thick- 

 ness. 

 Hard red clayey sandstone with green streaks - - - - . . 8 



Red clayey sandstone with thin partings 2-inch -j- of pure white 



gypsum ---------- 10 



Red sandy shale - - - - - - - - - io± 



Pure white massive gypsum ------- 3 6 



