434 Scientific Intelligence. 
North Platte have now been traced continuously over the intervening 
country from the mouth of the Yellow Stone river to the Platte. I have 
ascertained the fact that the lignite beds along the North Platte area con 
tinuation of those on the Upper Missouri, and that they extend in their 
full developement far up into the Wind river valley and along the Platte ‘2 
road to the Sweet Water mountains. As yet I have seen no indications of _ 
lignite in any of the divisions of the Cretaceous period except in formation — 
No. 1 near the Big Sioux river on the Missouri and in a series of sand: 
stones aud shales near Fort Benton which we have referred to the same 
As we proceed south and southwest in this region No, 1 seemsto — 
disappear gradually, and along the Laramie mountains I cannot determing 
one of the upper members of that basin is revealed along this river, and 
th i 
Note on Prof. Newberry’s criticisms of Prof. Heer’s determination — 
of species of North American Fossil Plants, in a letter to Prof. Asa Gaal ‘ 
j r: When I offered for publication in this Journal, — 
the translation of part of a letter from Prof, O. Heer, concerning som 
of the Cretaceous, I was unable to find there any fossil plants, 
ave never seen as yet an American Cretaceous plant. 42! 
‘¢ my arguinents only from the statements of Dr. Newberry 
It is unnecessary to recall the five points in discussion. ; 
The two first statements are, even from the assent of Dr.. 
satisfactorily explained by the insufficiency for exact determi! 
2 J’ 
