Mesozoic and Ccenozoic Geology and Palmontology. 117 



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. Haj^den 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 parts 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 fo •- 

 mations represent the American Eocene. 



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

 (lUeni, now Salvinia allenl, Planera longifolia; from Elko station, 

 Nevada, >iS'eg?(o/rt angustifoUa, Thuja gar mani, Abies nevadens is; from. 

 the Raton mountains. Sphagna lapidea^ Chondrites suhsimplex^ C. hul- 

 bosus, Hali/menites major^ H.striatus, Delesseria incrassata, now Cau- 

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

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

 orado, Sclerotium rubeUum, Delesseria fulva, Pteris anceps, Carex 

 berthoudi^ Sabal goldana, Quercus stramineus, JJlmus irregularis, noYf 

 Ficus irregularis, Ficus auriculata, F. specfabilis, Cissus Icevigatus, 

 Dombeyopsis trivialis, D. occidentalis, now Ficus occidentalis, Sapindus 

 caudatus, Ceanothusjibrillosus.nov^ Zizyphus Jibrillosus, Bhamnus cle- 

 buriii, B. goldanus, B. goldanus, var. latior; from Erie Mines, Boulder 

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

 Wyoming, Populus decipiens, Ficus oblanceolata, Coccoloba IcBvigata, 

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

 myricoe^ Opegrapha antiqua, Caulinites sparganioides, Myrica torreyi, 

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

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

 lobato-crenatus, Aleurites eocenica, Paliurus zizyphoides, Carpolitlies 



