with Descriptions of JVJ w Sped s of F< ssil Plan 



From this list it will be seen that the Cretaceous atrata of 

 the west coast include some forms not yet discovered in the 

 Kansas and Nebraska beds. Among these, Salisburia, Sabal, 

 Cinnamomum, &c, are indicative of a warmer climate. P< 

 bly these genera may hereafter be detected in the plan! 

 of Kansas, Nebraska, and New Mexico, but as ye! we have □ i 

 intimation of their existence, and there is nothing n >wn 



in the Cretaceous flora of that region which gives it a tropical 

 or even sub-tropical character. 



It will be remembered that this vegetation grew npon :i 

 broad continental surface, of which the central portion 

 considerably elevated. This would give us physical conditi 

 not unlike those of the continent al the preseni 

 would seem to be inevitable thai the isothermal lim mid 

 be curved over the surface somewhat as al | 

 very well happen, therefore, that we shall find the p and 



cinnamons restricted to the Western margin of th I 



