20 CONTRIBUTIONS TO PAL^ONTOLOGY 



bed lying between the massive sandstones of the Fox Hills. The precise position 

 of the leaf-bearing horizons may be up to 100 feet in error owing to the shght thick- 

 ening of the recognizable units toward the west. The section, showing lithology, 

 thickness, and the position of faunal and floral horizons (see figure 5), is as follows: 



Section in the Lewis, Fox Hills, and Medicine Bow formations in sec. 10, R. 95 W., T. 7 N., Colorado 



Thickness 

 Medieine Bow formation (lower part) : in feet 



Sandstone, grayish-brown, massive, resistant, lenticular, interbedded with thin, 

 gray, papery, clay shales; shale bed at top contains the brackish-water form: 



Ostrea sp . 90 



Coal bed 2 



Shale, gray, sandy, with lenses of soft, gray sandstone 10 



Sandstone, grayish-white, massive, resistant 10 



Sandstone, gray, massive, interbedded with softer, thinly bedded, shaly sandstones 90 



Shale, dark gray, sandy, with few interbedded lenses of soft sandstone 83 



Sandstone, gray, massive, resistant; approximate position of resistant sandstone 

 in the Craig area which yielded the following species of fossil plants (Locality 

 P. 375): 



Carpites walcotti PhylUtes craigensis 



Cinnamomum affine PhyUites triUioides 



Credneria protophyUoides Quercus viburnifoUa 



Cyperacites sp. SabaUtes eocenica 



Ficus crossii Sequoia nordenskioldi 



Ficus planicostata Trochodendroides nebrascensis 



MagnoUophyUum cordatum Typha sp. 



Myrica torreyi " 3 



Sandstone, grayish-white, soft, shaly, thinly bedded 42 



Shale, soft, sandy, with thin lenses of fine-grained, quartzitic gray sandstones; 

 approximate position of Kolasch ranch horizon which yielded the foUowing 

 species of fossil plants (LocaUty P. 376) : 



Cinnamomum afRne Laurophyllum meeki 



Cinnamomum linifolium Quercus viburnifolia 



Cissites lobatus Rhamnus cleburni 



Cornophyllum wardii Rhamnus salicifolius 



Credneria protophylloides ?SabaUtes montana 



Dombeyopsis trivialis Sequoia? acuminata 



Dryophyllum subfalcatum Sequoia nordenskioldi 



Ficus crossii Trochodendroides nebrascensis 



Ficus planicostata Viburnum marginatum 



Ficus trinervis Vitis stantoni 



Juglans priErugosa 30 



Sandstone, gray, shaly, soft, grading down into massive, cross-bedded sandstone . . 34 



Fox Hills f ormation : 



Sandstone, grayish-white, fairly resistant, irregularly cross-bedded, with many 

 scattered Umonite concretions; horizon 5 feet from top yielded the following 

 marine invertebrates : 



Acteon attenuatus Meek and Hayden 



Cardium whitei Dall 



Dosiniopsis sp. 



Legumen planulatum Conrad 



Mactra nitidula Meek and Hayden 



Modiola herseyi White 



