170 
PHYSICAL HISTORY OF THE 
identity of the deposits in the valleys belong¬ 
ing to these provinces with those of the valleys 
through which the actual tributaries of the 
Amazons flow; as, for instance,the Tocantins, 
the Xingu, the Tapajos, the Madeira, etc. Be¬ 
sides the fossils above alluded to from the 
eastern borders of this ancient basin, I have 
had recently another evidence of its cretaceous 
character from its southern region. Mr. Wil¬ 
liam Cliandless, on his return from a late jour¬ 
ney on the Bio Purus, presented me with a 
series of fossil remains of the highest interest, 
and undoubtedly belonging to the cretaceous 
period. They were collected by himself on 
the Rio Aquiry, an affluent of the Rio Purus. 
Most of them were found in place between the 
tenth and eleventh degrees of south latitude, 
and the sixty-seventh and sixty-ninth degrees 
of west longitude from Greenwich, in localities 
varying from 430 to 650 feet above the sea- 
level. There are among them remains of 
Mososaurus, and of Ashes closely allied to 
those already represented by Fanjas in his 
description of Maestricht, and characteristic, 
as is well known to geological students, of the 
most recent cretaceous period. 
