ST. JOHN.] SECTION THROUGH 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 throi({fh 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 Caiion, shown under the same number in last 

 preceding section. 



8G. Sag, Anth bluish-gray, soft, shaly, gTitty deposits above, 50 yards 

 across. 



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

 Dip oo^ 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 exjiosed ledge of bluish-gray, spar-seamed limestone, 5 

 feet, apparently dipping S. 40° W., at an angle of 48°. Pentacrimis, and 

 other indeterminate fossils. 



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



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



94. i)c&r/.s-covered slope, 30 yards. 



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

 the outcrop; dip 55°, X. 35° E. Contains Pewfacrmws. 



90. 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. Z>ei>'/6-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, 0. sfrigulecula, White, and Pcn- 

 tacrimis. 



102. Gray indurated shales, 15 yards. 



103. Brown sandstone, obscure ex^iosure. 



104. J^eftm-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 

 35°, X. 75° E. Obscure fossils. 



100. Gravish sandstone, seen in low, rocky ridge 40 feet across ; dip 

 44°, X. 55° E. 



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

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

 volcanic-covered bench is, ]ierhai)s, 400 feet lower than the summit. 



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

 to 30°, X. 35° E. 



109. DcbHs-coveTed slope, CO yards. 



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

 Belemnites densus f (htrca fffrifjulecula. 



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

 24 GS 



