LAMOUEEUX SECTION. 67 



The Lamoureux Section, — Hie sectioii tiloug' the limestone ridge uortlieast 

 of the head of Lamoureux Canyon (atlas sheet ix) exposes 4,300 feet of 

 strata, the lo^A•est members resting- immediateh- ujion the Eureka quartzite of 

 the flat-top hill about three-quarters of a mile south of Atryjia Peak. It is 

 impossible to say just how great a thickness of tliesc beds sliould l)e 

 assigned to the Lone Mountain epocli. rnquestionably the lower members 

 of the Silurian are wanting, and if a line l)e drawn placing the alternating 

 blue and light gray bedded rocks No. 6, in the Devonian, it would give 

 about 800 feet to the lower group. About 500 feet above this line a fossil- 

 iferous belt comes In, carrying a well known Devonian fauna. This fossil- 

 iferous belt may be traced around to the east slope of Atrypa Peak, where 

 a most abundant fauna occurs rich in generic and specific forms. Ilei'e at 

 Atrypa Peak, however, there are nearl\' 2,000 feet of strata ])elow the fos- 

 siliferous belt as against 1,300 feet in the Lamoureux Section before reaching 

 the Eureka (juartzite, but as the inclination of the beds can not well be deter- 

 mined no accurate measurement of the thickness can be given. Api)arentlv 

 the lowest horizon at Atrypa Peak is below the one shown in the section, 

 although the character of the sedimentation is nuich the same. 



The section is as follows : 



Section East of Lamoureux Canyon — i, 300 feet. 



Feet. 



1. Brown anil hliu- linii'stonc, well bedded, with oceasioiial 



mottled beds .■{()() 



2. BrowuLsh gvaj, finely strijjed. well bedded limestone, witli 



corals 1,(1(10 



3. Dark bine, light gray, and brownish limestone 1, ()(»0 



4. Alternating dark and light limestone oOO 



5. FossDiferous slialy belt 200 



6. Light blue and gray bedded limestone 500 



7. Light colored siliceons limestone, with indistinct bedding. . SOO 



g ( Thin layer of black siliceous limestone. 

 ■ ( Eureka quartzite. 



4, 300 



County Peak Section. — Qu the cast side of the Eureka District, in the region 



of County Peak, the Devonian rocks offer still another section quite similar 



in the character of its sedimentation to those alreadv given. It includes a 



portion of the Lone Mountain rocks exposed in the bluffs on the east side 



