576 



APPENDIX. 

 Section in the Eureka District, Nevada. 1 



Names of Formations. 



Upper Coal-measures 



Weber conglomerate 



Thickness 



in Feet. 



500 



2000 



Characteristics. 



Light-colored blue and drab limestones. 



Coarse and fine conglomerates, containing chert 

 and layers of reddish-yellow sandstone. 



Lower Coal-meas- 

 ures. 



Transition fauna at 

 base. 



3800 



Heavy bedded dark-blue and gray limestone, 

 with intercalated bands of chert, argillaceous 

 beds near base. 



a? J Diamond Peak 

 quartzite. 



3000 



Massive gray and brown quartzite, with shalee 

 at summit. 





White Pine shale. 



2000 



Black, sometimes arenaceous, with intercala- 

 tions of friable sandstone, varying from point 

 to point. 



Nevada limestone. 



6000 



Massive to thin-bedded, of variable color and 

 texture; highly fossiliferous. 



Lone Mountain lime- 

 stone. 



Unconformity -^^^- 



Eureka quartzite. 



1800 



500 



Trenton fossils at base; Silurian fossils above. 



Compact and vitreous, white, and blue, reddish 

 near base. 



> 1 

 o 



o 



a 



O 



Pogonip limestone. 



2700 



Tnterstratified limestones, argillites; arena- 

 ceous beds at base; fine-grained, bluish-gray. 

 Limestone distinctly bedded above; highly 

 fossiliferous. Mingling of Cambrian and Or- 

 dovician fossils at the base. 



Hamburg shale. 



350 



Chert nodules abundant, especially near the top. 



Hamburg limestone, 



1200 



Dark gray and granular; only slight traecs of 

 bedding. 



Secret Canyon shale 



1600 



Yellow and gray argillaceous shales, passing 

 into shaly limestone; interstratined layers of 

 shale and thin-bedded limestones near top. 



;g^g J Prospect Mountain 

 a g ] limestone. 



3050 



Gray, compact limestone, bedding planes im- 

 perfect. Olenellus fauna at base. 



■jg J Prospect Mountain 

 g J quartzite. 



6 l 



1500 



Bedded brownish-white quartzite; layers of 

 arenaceous shale; no fossils. 



1 Hague, Mon. XX, pp. 13-87, U. S. Geol. Surv., and Walcott, Mon. VIII, U. S. Geol. Sur- 

 pp. 8 and 283. 



