QUADKANT MOUNTAIN'. 



35 



Section of beds exposed at the southeastern end of Quadrant Mountain — Continued. 



Crow- 

 foot 



sec- Solu- 

 tion, ber. 



Feet. 



32 



31 



30 



I'll 



28 

 28 



19 Limestone breccia. The lower 30 feet is a white limestoue, weathering cream, con- 

 taining angular fragments of blue, brown, and buff limestone, from one-eighth 

 of an inch to 2 inches in diameter. The matrix is coarsely granular, and grades 

 above the first 30 feet into a crushed and splintered limestone similar to the 

 matrix just mentioned. The outcrop is massive, rough weathering, often pinkish. 



Rock is slightly cherty. Dip, 12° N. ; strike, S. 78° W 



18 Limestone, finely crystalline, gray, weathering light gray, with granular surface. 

 Generally massive, though bedded at base. No fossils seen ; is splintery and 



weathers rough 



17 Limestone, very light brownish gray, splintered and cemented by calcite in strings, 



and by blue limestone 



16 Limestone, brecciated at the base; matrix gray, fragments angular, brown and 

 brownish gray; above this the limestone is massive and gray. Seamed with cal- 

 cite and carries much of that mineral in pockets. It is somewhat cherty at the 



base 



15 Interval; no exposure 



' 14 Limestone, finely crystalline and granular, brown, somewhat cherty 



13 Limestone, very fine grained with sparsely disseminated chert, but varying to a 

 very coarse-grained blue-gray rock. Color in general a light brown-gray. 



Weathers into irregular warped plates, due to jointing 



12 Limestone, coarsely crystalline, brownish gray, weathering gray with granular 



surface. Irregularly bedded; fossiliferous; much broken by vertical jointing. .. 



11 Limestone, finely crystalline, generally thinly bedded, sometimes dark gray, but 



mostly brown, with granular weathered surface, or a blue-gray more coarsely 



crystalline limestone. Dip, 5° N 



106 Limestone, similar to No. 10a, but well banded. The fossiliferous layers weather- 

 ing blue-gray; the noufossiliferous bands denser, granular, weathering light 



brown, and 1 to 3 inches thick 



10a Limestone, in alternating layers of light gray, finely crystalline and darker, coarsely 



crystalline and fossiliferous. Dip, 4° NW 



9 Interval ; no exposure 



8 Limestone, finely granular, light brown, weathering same color; fissile, contains 



remains of fossils. Talus indicates a greater thickness than that given 



7 Interval; no exposure 



6 Limestone, light gray, finely crystalline, with gray and granular, glistening, weath- 

 ered surface 



5 Interval ; no exposnre 



4 Limestone, coarsely crystalline, dark gray, weathering the-same color; fossiliferous 



fragments 



3 Limestone, forming a well-marked and prominent ledge extending around the 

 mountain; massive, light drab, weathering dark gray and brown with glossy 



beaded crust. Contains corals and other fossils 



2 Interval ; no exposure 



1 Limestone, cherty, crystalline but not granular, compact, massively bedded. The 

 upper part fossiliferous, containing crinoid stems, corals, and spirifers. Dip, 

 about 5° N 



135 



65 



35 



50 



80 

 10 



75 



25 



90 



10 



10 



12 



65 



15 



45 

 60 



60 



