On the Triassic Rocks of Kansas and Nebraska. 33 
(Hitingshausinia) mentioned by Mr. Hawn* as occurring in the 
formation referred by him to the Trias, thus establishing beyond 
the possibility of a reasonable doubt, the identity of the sup- 
posed Triassic deposits of Kansas, and No. 1, of the Nebraska 
section. . 
remark that they are quite abundant in this formation, both in 
re he says: “They include so many highly’ organized 
plants, that were there not among the veral genera exclu 
“A single glance is sufficient to satisfy any one they are not 
Triassic. Up to the present time no angiosperm dicotyledonous 
plants have bo found in rocks older than the Cretaceous, while 
of the eighteen species which comprise your collection sixteen 
are of this character.” * * * * 
“The species of your fossil plants are probably all new; 
though generally closely allied to the Cretaceous species of the 
Old World. From the limited study I have given them I have 
referred. them to the following genera: i 
Sphenopteris. Pyrus? 
Abietites. Alnus. 
~ Acer. : Salix. 
Fagus. Magnolia. 
Populus. C i 
Cornus. Ettingshausinia.” 
“ Of these the last two are exclusively Cretaceous, and highly 
characteristic of that formation in : 
Ok es eae x * * * * 
__“I may say in confirmation of the assertion that your fossil 
plants are Cretaceous, that I found near the base of the yellow 
Jurassic Mr 
. shit series'in New Mexico, considered 
i 
te 
__ *tarcou,—a very similar flora to that represented by your speci- 
_ Mens, One species at least being identical with yours, associated 
With Gryphea, Inoceramus, and Ammonites of lower Cretaceous 
‘oa 
,* Prof. Swallow exhibited a specimen of this species at the Baltimore meeting 
of the Nat igaeuien ‘ae : rE 
SECOND SERIES, Vor. XXVII, No. 79.—JAN., 1859. 
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