i;]o 



(GEOLOGICAL HISTOEY OF LAKE LAHONTAN. 



Section B. — finest bank of Humboldt River, i mile above Oreana. 



Feet. 



1. Marly clay, light colored, sandy 30 



2. Marly clay, yellowish, fine-grained, laminated 4 



3. Marly clay, light colored, sandy, like No. 1 4 



4. Gravel, cross-bed, ferrugiuous 1 



5. Marly clay, drab-colorod 1 



6. Gravel, oross-bedded, ferruginous 1 



7. Marly clay, finely laminated, jointed 5 



8. Marly clay, more sandy than No. 7, thick-bedded ; to river 15 



61 



The exposures in this portion of the canon walls vary greatly as one 

 follows them up or down stream. The middle member especially changes 

 in both the character of the strata and their inclination. 



Section C. — Went banh of Humboldt Bivei; 2i miles above Oreana. 



Feet. 



1. Sand and gravel 12 



2. Marlv clays, white, laminated 12l „ , , , 



„-,,',, ■ , 1 ,~ ( Upper lacustral clays. 



3. Marly clays, brownish, loams 10 ! ' ^ 



4. Marly clays, white 25 J 



5. Gravel and sand, cross-stratified 25 Medial gravels. 



6. Marly clays and loam ; to river 10 Lower lacustral clays 



94 



Section F. — IVest bank of Humboldt Biver, at Bye Patch. 



1. 

 2. 

 3. 

 4. 

 5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 



14. 

 15. 

 16. 



iEolian sand and alluvial gravel, variable.. 

 Loam, sandy, light-colored, fine 



'Tufa mushrooms" (dendritic tufa) 



Feet. 



1 to6 



12 



0.9 



_ . ., , , 1 1 11 „ n 1 Upper laoustral clays. 



Ostracoid and gasteropod shells 0.2 f '■'■ 



Sand, loamy, butf-colored, with small concre- | 



tions of gypsum 



Gravel, rounded, cross-stratified 



Marl, buff'-colored 



Gravel, cross-stratified 



Loam, with some cross-bedded gravel 



Gravel, cross-stratified 



Sand, cemented by carbonate of lime 



Loam, fine, cross-stratified 2 



Sand, white, marly (much thicker in east 



wall of canon') 4 



Loam, vpith irregular strata of gravel 40 



Gravel, cemented 1 



Loam and fine gravel : to river 75 



16 

 18.51 



6 



9 



7 



3 



0. 4 ^ Medial gravels. 



Lower lacustral clays. 



196 to 201 



The separation of the three members is more difficidt to trace in this 

 locality than is usual; the above divisions are somewhat arbitrary. 



