BT.TOHN.] SECTION THKOUGH STATION XX. 369 



point, in the abrupt slopes terminating the spur, sandstones and drab 

 limestone ledges are seen, probably the equivalents of the strata occur- 

 ring" below the summit in the ridge of the previous section. The section 

 here exposed, along a north-south line, commencing one and a quarter 

 miles south of Station XX, is as follows : 



Section through Station XX 



85. Heavy ledge of grayish, rusty- weathered, fragmentary limestone ; 

 dip northward. This bed may be the same as that in crest of ridge 

 southeast of Fall Creek Canon, shown under the same number in last 

 preceding section. 



86. Sag, with bluish-gray, soft, shaly, gritty deposits above, 50 yards 

 across. 



87. Dark gray, thin-bedded, fragmentary limestone, exposed 8 feet. 

 Dip 35° to 45°, X. 25° E. Contains segments of the column of Penta- 

 crinus, and a small Echinoid (?) spine. 



88. Slight depression covered with debris, 50 to 60 yards. 



89. Gray sandstone, in part thin-bedded, obscure outcrop in low crest. 



90. Deep sag, in the bottom and north slope of which appear red shales, 

 120 yards, more or less. 



91. Obscurely exposed ledge of bluish-gray, spar-seamed limestone, 5 

 feet, apparently dipping S. 40° TV., at an angle of 48°. Pentacrinus^ and 

 other indeterminate fossils. 



92. Drab, indurated, arenaceous shales, 30 yards. 



93. Limestone, similar to bed 91, 5 feet. 



94. Debris-covered slope, 30 yards. 



95. Dark blue-gray, brittle, spar-seamed limestone, 10 to 20 feet across 

 the outcrop; dip oo°, X. 35° E. Contains Pentacrinus. 



9o. Light drab, indurated shales, 30 yards. 



97. Limestone, like preceding bed, 10 to 20 feet across the exposure. 



98. Broad, shallow sag, with red shales, 100 yards. 



99. Brownish-red sandstone, obscure exposure. 



100. De&m-covered slope, with shaly, gray sandstone above, 150 

 yards. 



101. Brown, hard, thin-bedded, gritty limestone, 5 feet exposed ; dip 

 35°, X. GO E. Contains a small Ostrea, O. strigulecula. White, and Pen- 

 tacrin us. 



102. Gray indurated shales, 15 yards. 



103. Brown sandstone, obscure exposure. 



104. De&m-covered, shallow sag, 35 yards. 



105. Darkish-gray limestone, imperfect exposure of a heavy ledge, 

 associated with greenish-gray sandstone, 40 feet across outcrop; dip 

 35o, X. 75o E. Obscure fossils. 



10G. Grayish sandstone, seen in low, rocky ridge 40 feet across ; dip 

 44o, X. 55o E. 



107. Debris-covered surface, upon which rest large, abraded bowlder- 

 like masses of dark, rusty vesicular lava with obsidian, 300 yards. This 

 volcanic-covered bench is, perhaps, 400 feet lower than the summit. 



108. Heavy bed gray, thin-bedded sandstone, 20 to 25 feet ; dip 25° 

 to 30O X. 353 E. 



109. Debris-covered slope, 60 yards. 



110. Dirty gray, fragmentary limestone, obscure exposure. Contains 

 Belemnites densus ? Ostrea strigulecula. 



111. Slope, covered with debris and fragments of obsidian, 10 yards. 

 24 as 



