

MODE OF OCCUEEENCE OF FOSSIL WOOD. 



2 



35 



be seen that there are only two species common to both Chalk Bluffs and 

 Table Mountain, but that ten genera are represented at both places. 



: 



Name of Species. 



Chalk 



Bo wens'. Table 



Name of Species. 



Chalk 



Bowens'. Table 





Bluffs. 



Mountain. 





Blufts. 



Mountain 



Sabalitea Calif "or nicus 







Aralia Whitney i 



* 





Betula soqualis 



. * 





" Zaddachi 1 





* 



Fagus Antipofi 





* 



" angnstiloba 



* 





" pseudo-ferruginca 



* 





Cornus ovalis 





* 



Quercos eleBnoides 





* 



" Kelloggii 



* 





r * cohvexa 





* 



Magnolia lanceolata 



* 





u Nevadensis 



* 





" Californica 



* 





" distincta 



* 





Acer sequidentatuni 



* 





** Goepperti 



* 





" Bolanderi 





* 



" Voyana 



* 





Ilex prnnifolia 





* 



" pseudo-lyrata 



? 



? 



Z i zyplms microphallus 



* 





Castaneopsis chryaopliylloides 



# 





" piperoides 



* 





Salix Californica 





* 



Rhus typhinoides 





* 



" elliptica 



# 





" Boweniana 



? 



* 



Populus Zaddachi 



* 





" mixta 



* 





Platanus append] culata 



# 





" myricaifolia 



* 





" dissecta 



* 



* 



" metopioides 





* 



Liquidambar Cal if ornicum 



* 





" dispersa 





* 



Uhnus Californica 



* 



# 



Zan th oxy I on di versifolium 





* 



" pseudo-fulva 



* 





Juglana Californica 



* 





" ail in is 





* 



t( Oregon i ana 



? 



1 



Ficua sordida 



* 





" laurinea 



* 





" tilirefolia 



* 





« egregia 



* 





" inicrophylla 



■ _ 





* 



Cercocarpus antiquus 





* 



1 ersea pseudo-Carolinensis 





* 









I 



In regard to the geological age indicated by the plants in question, it is 

 not necessary to do more than refer to what Mr. Lesquereux has said in 

 Part II. of this volume. This subject will come up to some extent again in 

 a future chapter; and the supposed influence of the glacial epoch in effecting 

 changes in the flora of the Atlantic and Pacific slopes will also be discussed 

 m its proper place, after the facts relating to the former presence of ice in 

 the Sierra Nevada have been set forth. It is sufficient, at this time, to note 

 the facts that the fossil flora of the gravel deposits is entirely different from 

 that now prevailing in that region ; and that it is considered by Mr. Les- 

 quereux as Pliocene, while he admits at the same time that it is related by 

 some identical or closely allied forms to the Miocene. 







tu 





It will be proper to add some of the most important facts gathered durin 

 o investigation of the gravel deposits in regard to the mode of occurrence 

 of the fossil plants of the Pliocene epoch. The vertical range of these has 

 be en alluded to, and it may be more distinctly stated that either fossil wood 

 °r leaves have been found at every elevation, from the lowest to the highest, 

 Where gravels occur. Even as high as Silver Mountain City, at 7,000 feet of 



