Mesozolc and Ccenozoic Geology and Paloiontology. 107 



•of the water brought up by the force acting to the upraising of the 

 bottom into land, and afterward into chains of mountains. Though it 

 may be, this change is evident and proves the geological discrimina- 

 tion of the Eocene sandstone from the Cretaceous, a separation the 

 more remarkable, that from numerous observations this sandstone is 

 reported constantly conformable to the Upper Cretaceous beds. As 

 Dr. Hayden remarks in his description of the Lignitic 'Group of 

 Nebraska, when we bear in mind the fact that wherever this forma- 

 tion has been seen in contact with the latest Cretaceous beds, the two 

 have been found to be conformable, however great the upheavals and 

 distortions may be, while at the junction there seems to be a complete 

 mingling of sediments, one is strongly impressed with the probability 

 that no important member of either system is wanting between them. 



After contrasting the distribution and character of the plants with 

 those known from the Tertiary of other part-s of the world. Prof. Les- 

 quereux thought himself authorized to deduce the conclusion: 

 That the great Lignitic Group must be considered as a whole and 

 well characterized formation, limited at its base by the fucoidal sand- 

 stone, at its top by the conglomerate beds; that, independent from the 

 Cretaceous under it, and from the Miocene above it, our Lignitic for- 

 mations represent the American Eocene. 



He described, from South Park, near Costello's ranch, Ophioglossum 

 nlleni, now Salviaia alleni, Planera longifoUa; from Elko station, 

 Nevada, Sequoia angustifolia, Thuja garmani, Abies nevadensis; from 

 the Raton mountains, Sphoiria lapldea^ Chondrites subsimplex, C. bul- 

 bosus, Hahjmenites major, H. striatns, Delesseria incrassata, now Cau- 

 lerpites Incrassatus, Delesseria lingulata; from Gehrung's coal-bed, 

 near Colorado Springs, Dombeyopsis obtusa; from Golden City, Col- 

 orado, Sclerotiiim rubelluni, Delesseria fiilva, Pteris anceps, Carex 

 berthoudi^ Sabal goldana, Quercus stramineus, Ulmiis irregularis, now 

 Ficus irregularis, Ficus auriculata, F. spectabilis, Cissies Imvigatus, 

 Dombeyopsis trivialis, D. occidentah's, now Ficus occidentalis, Sapindus 

 caudatus, Ceanothusfibrillosus, now Zizyphus fibriUosus, Bhamnus cle- 

 burni, B. goldanics, B. goldanus, var. lafior; from Erie Mines, Boulder 

 Valley, CauUnites fecundus, Cercis eocenica; from Carbon station, 

 Wyoming, Populus decipiens, Ficus oblanceolata, Coccoloba Icevigata, 

 Asimina eocenica, Zizyphus meelci; from Black Butte station, Sphaeria 

 myricce, Opegrapha antiqua, CauUnites sparganioides, Myrica torreyi, 

 Ficus planicostata, F. planicostata, var. latifolia^ F. clintoni, F. cory- 

 lifoUus, F. haydeni, Vibernum marginatum, V. contortum, Cissus 

 lobato-crenatus, Aleurites eocenica, Paliurus zizyphoides, Carpolithes 



