with Descriptions of New Sj 



therefore, that Prof. Ileer Bhould have c red them of! 



tiary age, and that this opinion should be Bhared by many othi 



Soon after the discovery of these plants by Dr. Eayden, ho 

 went again to Nebraska and Kansas, accompanied by Mr. 

 Meek, and collected from various exposures of Lowcj ! 

 ous sandstone numerous additional specimens of the same and 

 different species. Subsequently, I went myself to I 

 where these were collected, and spent Bome years in the Btudy 

 of the geology of the interior of the continent, exploring n In 

 area occupied by Cretaceous rocks, in Kansas, I Ari- 



zona, New Mexico, and Utah. During these exploral 

 tained from the Cretaceous strata, at a greal number of localil 

 angiospermous leaves, consisting of some of the 

 by Dr. Hayden, with many others, all of which are 

 in the report of the San Juan expedition, no publish 



In numerous instances, as Dr. Hayden had done, I ol 

 these leaves from the sandstones overlaid by calcai 

 containing Gryphom Pitcheri, Inoceramus pi ' "i' 1 



many other unmistakable Cretaceous fossils. Thee 

 found to be characteristic of the strata in which I 

 discovered, and was able to obtain them at m 

 sure which I examined. In the end I had before me, 

 by Dr: Hayden and myself, at least fifty distil 

 leaves of this character from this horizon, with lY.< 

 scarcely sufficient for description, of perhaps as many 

 Though Mr. Meek, Dr. Hayden and myself had thu 

 strated the true position first taken by us in 

 of the beds which furnish these leaves, the flora th( 

 ted was so modern in its character thai tl 

 tol 2 were still unwilling admil I 



ing older than Tertiary ; and i 

 Marcou and Prof. Oapellini mad. 

 braska, and collected fossils from I 

 yielded tl..: ' ; and Hayden, tht 



that this flora was reall 



