ACADEMY OF NATURAL SCIENCES. 311 



from Mr. Remond, giving an account of his geological explorations 

 in Peru and Chile. Mr. Remond has obtained a suite of plants 

 from the coal-bearing formation of Northern Chile, sufficient in 

 number to fix its age as Triassic. Two species, one a Pecopteris, 

 the other a Pterophyllum, are apparently identical with those found 

 with the coal near Los Bronces, in Sonora, Mexico, by Mr. Remond. 

 Above the coal-bearing conglomerates and sandstones, there are 

 stratified porphyries, and above these, fossiliferous limestones of 

 Liassic age. The fossils in this last mentioned formation are, in 

 general, similar to those found by Domeyko and Darwin, at Las Jun- 

 tas and Tres Cruces ; but Mr. Remond obtained several new species. 

 He also collected a large number of species in the Tertiaries of 

 Coquimbo and Caldera. Farther, he obtained fossils in sufficient 

 numbers from the rocks in which are the famous silver mines of 

 Chaiiarcillo and Tres Puntas, to fix their age as belonging to the 

 Lower Cretaceous. 



Professor Whitney commented on the importance of these 

 investigations, especially that concerning the age of the Chile coal. 

 It is very interesting to know that the same formation carries coal 

 in Chile which has been found to bear that indispensable material 

 in Northern Mexico. The vast extent over which Triassic rocks 

 occur in Arizona, New Mexico, and Nevada, gives a peculiar 

 interest to every discovery of this kind. 



Regular Meeting, December 17th, 18(>*>. 

 President in the chair. 



Twelve members present. 



Dr. F. Hansen was elected a Resident Member. 



Donation to the Cabinet : Skeleton of a Beaver, presented by 

 Mr. S. Hubbard. 



Donation to the Library : Ninety-six volumes and pamphlets 

 chiefly on various branches of natural history, from the library 

 of the late William Cooper, of New York, presented by J. G. 

 Cooper, M.D. 



