UNIVERSITY OF CALIFORNIA PUBLICATIONS 



BULLETIN OF THE DEPARTMENT OF 



GEOLOGY 



Vol. 7, No. 24, pp. 443-464, pis. 22-25 Issued January 22, 1914 



PLEISTOCENE BEDS AT MANIX IN THE 

 EASTERN MOHAVE DESERT 

 REGION 



BY 



JOHN P. BUWALDA 



Contents 



PAGE 



Introduction 443 



General Geographic and Geologic Features of the Eegion 444 



Pre-Pleistocene Geology 445 



Pleistocene Fanglomerates 446 



Pleistocene Lacustral Beds 448 



Areal Extent 448 



Physical Characters 449 



Stratigraphic Relations 450 



Fauna : 451 



Deformation of the Fanglomerates and Lacustral Beds 451 



Mode of Origin and Cause of Disappearance of Manix Lake 454 



Mode of Origin 454 



Disappearance of the Lake 455 



Evidence of Climatic Change in the Manix Lake Eegion in Pleistocene 



Time 456 



Summary 456 



Introduction 



While engaged in the collection of fossil vertebrate material 

 in the eastern Mohave Desert region for the Department of 

 Palaeontology of the University of California, the writer exam- 

 ined a. series of Pleistocene mammal-bearing lake beds, which 

 appear to have been deposited in the latest period of deforma- 

 tion in that region. Excellent exposures of the beds occur along 



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