[Annals N. Y. Acad. Sci., Vol. XIX, No. 7, Part II, pp. 149-160. 15 January, 
1910.] 
PATAGONIA AND THE PAMPAS CENOZOIC OF SOUTH AMER¬ 
ICA. A CRITICAL REVIEW OF THE CORRELATIONS OF 
SANTIAGO ROTH, 1 1908. 
By W. D. Matthew. 
(Read December 6, 1909, before the New York Academy of Sciences.) 
This valuable contribution from Dr. Santiago Roth, of the La Plata 
Museum, bears throughout the mark of a cautious, able and judicious 
investigator, thoroughly familiar by first hand observation with the forma¬ 
tions discussed, well-acquainted with the European Tertiary faunae that are 
chiefly used for comparisons and with the broad principles upon which such 
correlations have usually been based. Dr. Roth’s paper is illustrated by a 
series of instructive photographs of the formations described, and constitutes 
a most welcome contribution to one of the most important correlation prob¬ 
lems of the present day. He intends soon to present fully the paleontological 
evidence in his hands. 
The age of the later Mesozoic and Cenozoic formations of the Argentine 
Republic has become a problem of high scientific importance on account of 
the extraordinarily rich and varied mammalian faunae which they have 
yielded. 
In more recent years, interest in the fossils of the Argentine has been 
renewed by the discovery of a series of mammal faunae older than the Pam- 
pean and no less remarkable. The first credit for these later discoveries 
is due to the tireless energy of the distinguished Argentine paleontologist, 
Florentino Ameghino, now director of the Museo Nacional of Buenos Aires; 
who in his earlier years played a large part in obtaining the great Pampean 
collections of the Paris Museum and the American Museum of Natural 
History. Finally, in the Museum of La Plata, the efforts of Moreno, Roth 
and Mercerat have brought together a collection of South American fossil 
mammals second only to that of the Museo Nacional. 
1 S. Roth: Beitrag zur Gliederung der Sediraentablagerungen in Patagonien und der 
Pampasregion. Neues Jahrbuch, B. B. XXVI, s. 92-150, taf. xi-xvii. Stuttgart, 1908. 
149 
