73 2 



ARTHUR C. TROWBRIDGE 



that it includes coarser materials and has a lens and pocket struc- 

 ture (cf. Figs. 19 and 21). 



Origin of the older deposit at the foot of the Inyos. — It will be seen 

 from the foregoing that most of the older deposit is sufficiently 

 unlike the Sierra bajada to lead one to conclude that its mode or 

 conditions of origin were not the same. On the other hand, if 

 it be compared with the near-shore phase of the lake beds in Wau- 

 cobi Canyon, a strong resemblance will be seen: (1) Both deposits 



Fig. 21. — Stream deposit in Mazourka Canyon. Compare with Figs. 14 and 15 



were formed and eroded before the deposition of the recent alluvium. 

 (2) Both are firmly cemented, at least locally. (3) They are similar 

 in texture, both being fine and having a low textural range. (4) 

 Their stratification is the same, both being sorted into layers. They 

 are dissimilar in that the constituents of the deposits at the foot of 

 the mountains are better rounded than those in Waucobi Canyon, 

 and the former contain no fossils. With such similarities between 

 these deposits and the lake beds, it seems clear that the older 

 materials northeast of Mt. Whitney station and east of Citrus are 

 of lacustrine origin, and belong to the same formation as the lake 

 beds in Waucobi Canyon and at Haiwee. If so, the lake in which 

 they were deposited was shallow, and the shore lay against the 



