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STUDIES IN GEOLOGY, No. 4 



Singewald and Berry 2 the Desaguadero series. I saw no 

 evidence of the former greater extent of Lake Titicaca in this 

 region, although this is not improbable. .The only raised 

 strand lines that I saw anywhere in Bolivia were in the 

 marginal hills of the Cordillera east of Lake Poopo. 



I regard the Jancocata plant horizon as of approximately 

 the same age as the beds near the Desaguadero River in the 



Cerro Jancocata, Dept. La Paz, Fossil plant locality. 



vicinity of Ulloma about 85 km. southeast of Jancocata, from 

 which a considerable mammalian fauna has been described. 3 



2 Singewald & Berry, Johns Hopkins Studies in Geology, No. I, 

 p. 49, 1922. 



3 Philippi, R. A., Zeits. Deutsch. Geol. Gesell., Bd. 45, pp. 87-96, 

 1893. Pompeckj, J. P., PaLneontographica, Bd. 52, 1905. Sefve, I., 

 Geol. Inst. Univ. Upsala Bull., vol. 12, pp. 205-256, 1914; vol. 13, pp. 

 61-92, 1915. 



