Vol. 4 1 Knopf-Tkelen. — Geology of Mineral King. 



243 



dykes which are apparently apophysal from the tonalite 

 intrusive. 



Owing to the nearly complete absence of fossil content, the 

 unreliableness of intercalated voleanies as data planes and the 

 lenticular habit of the stratified rocks, correlations between va- 

 rious cross-sections can only be made in general terms. Where 

 thicknesses are given, it must be borne in mind that their accu- 

 racy is conditional upon the accessibility or inaccessibility of the 

 territory. 



Section across Timber Gap. — A section along the ridge at 

 Timber Gap reveals the following succession passing from west 

 to east : 



1. Various faeies quartz porphyry 500 ft. 



2. Banded red and white quartzite 150 



3. White and gray laminated limestone 50 



(The two feet adjacent to the next following formation are 



highly contorted and the laminae are often reversed.) 



4. Phyllitie schist 50 



5. Arenaceous slates, siliceous schists and clay slates 300 



6. Phyllites and clay slates 800 



(Contains a 2-foot bed friction breccia.) 



7. Siliceous schists, with subordinate schistose quartzites inter- 



bedded ; thin bands clay slates 350 



8. Sheared conglomerate, tuffaceous 200 



9. A few feet phyllite, tuffaceous slate and green schist with cherty 



layers 750 



10. Clay slates 35 



I 1. Tuff 175 



12. Calcareous quartzite, occasional limestone lenses 180 



13. Clay slates 300 



14. Schistose white quartzite 50 



(Contains 4-foot bed blue limestone.) 



15. Sericitic quartz porphyries 400 



16. Blue gray quartzites 500 



17. Sericitic quartz porphyries 350 



IS. Quartzite 50 



19. Sheared feldspar porphyry 800 



Total thickness exposed 6,090 ft. 



The series is completely conformable throughout its entire 

 thickness. The strike is very uniformly N. 60° W. (magnetic) 

 and the dip may be inclined a few degrees from the vertical on 



