ABSTEACT OF MONOGRAPH. 5 



indicates that man inhabited the Far West during the last I'ise of Lake 

 Lahontan (page 247). 



Chapter VII is a summary of the hi.story of the former lake (page 250). 



Chapter VIII contains a discussion of the Qviaternary climate as de- 

 termined from the records of Lake Lahontan. The periods of greatest lake 

 expansion are correlated with the two glacial epochs of the Sierra Nevada, 

 and ai'e believed to indicate cold and moderately humid periods (page 259). 

 That the lake did not overflow is taken as evidence that tlie climate, even 

 dining the high stages of the lake, was only moderately humid. The climatic 

 chansres that brought about such marked alterations in the character of the 

 Great Basin are thought to have been of moderate intensity. 



Chapter IX is devoted to a summary of the evidence bearing on the 

 determination of the geological age of the lake. The conclusion reached is 

 that it existed during the Quaternary, but was more recent than the date 

 usually assigned for the close of the glacial epoch. 



Chapter X brings the present study to a close, and contains an account 

 of the orographic movements that have affected the Lahontan basin since 

 the last high-water period. The post-Lahontan faults actuall}^ observed 

 are represented on Plate XLV. 



