Brongniart ("Ann.

Sci.

Nat." Volume XXVIII., page 394, 1833.) The fossil shells appear to me to be far more different from the recent ones than in the great Patagonian formation; it will be curious if an Eocene and Miocene (recent there is abundance of) could be proved to exist in S.America as well as in Europe.

I have been much interested by finding abundance of recent shells at an elevation of 1,300 feet; the country in many places is scattered over with shells but these are all littoral ones.

So that I suppose the 1,300 feet elevation must be owing to a succession of small elevations such as in 1822.