GEOLOGY: E. W. BERRY 
283 
The problem has then found a partial solution, inasmuch as we have 
traced the growth of Zuni communities and the ancient isolated char- 
acter of their habitat. On the other hand the evidences for cultural 
isolation lie only in the development of such items as pottery designs of 
specifically Zunian character, the general nature of their culture-history 
as a whole showing a common growth with their Rio Grande neighbors. 
The few data now at hand for the Southwest suggest a marked uni- 
formity of culture throughout that area from the earliest times, with 
the gradual individualization by the several tribes of certain minor 
culture traits. 
Whatever its specific results, this study has shown that the method 
of assumed seriation can be applied to archeological phenomena. So 
far as the method is concerned, the novelty lies in its application to 
American culture-history. 
The full data will be published in the Anthropological Papers of the 
American Museum of Natural History. 
1 Fewkes, J. W., /. Amer. Ethn. Arch., Boston, 1, 1891. 
2 Kroeber, A. L., Anthrop. Papers Amer. Mus. Nat. Hist., New York, 18, 1916; these 
Proceedings, 2, 1916, (42^5). 
3 Nelson, N. C, Amer. Anthrop., N. S., 18, (159-180). 
* Kidder, A. V., Memoirs Amer. Anthrop. Assn., 2, (407-462). 
6 Kidder, A. V., these Proceedings, 2, 1916, (119-123). 
THE AGE OF THE BOLIVIAN ANDES 
By Edward W. Berry 
GEOLOGICAL LABORATORY. JOHNS HOPKINS UNIVERSITY 
Communicated by H. F. Reid, February 26, 1917 
During the joint explorations of Messrs. J. T. Singewald, Jr., and B. 
L. Miller in South America extending over several months in 1915 fossil 
plants were collected at two localities in the highlands of Bolivia. One, 
an entirely new locality at Corocoro' near the western edge of the alti- 
planicie or high plateau of Bolivia and the other at Potosi in the Cor- 
dillera Real or Eastern range of the Andes, from which fossil plants had 
previously been described by both Engelhardt^ and Britton.^ 
In the series of volcanic tuffs which contain the fossil plants at the 
latter locaHty and from a slightly lower level a few marine fossils were 
collected and as the age of these tuffs has never been determined and as 
they throw an unexpected light on the age of the eastern range of the 
Bolivian Andes and of the extensive miner ahzation of that region a brief 
preliminary announcement seems desirable. 
Although the textbooks tell us that the Andes date from Cretaceous 
