FOX HILLS AND LOWER MEDICINE BOW 11 



thickness, and the position of faunal and floral horizons, as shown in figure 5, is 



as foUows: 



Sedion in the Lewis, Fox Hills, and Medicine Bow formations in secs. 2 and 3, T. 22 N., R. 85 W., 



Wyommg ' 



Thtckness 



Medicine Bow f ormation (lower part) : ^ " -^^^' 



Sandstone gray, soft, massive, witli concretionary lenses alternating with lignitic 



shales Hard ycllowish 4-foot layers of sandstone near middle and top . . 7^ 

 Sandstone grav, hard, thinlv bedded, weathering to light brown. Hard gray bed 

 near base yielded the following species of fossil plants (Locahty P. 3/2): 



Bracts (?) Myrica torreyi 



Canna cf C? magnifolia Palmocarpon? subcyhndricura 



Carpites gluma;formis Pandanites corsoni 



Celastrus taurinensis Phyllites colubrmoides 



Cinnamomum afRne Phyllites sp. 



Cissites lobatus Pistacia eriensis 



Cyperacites sp. Quercus viburmfoha 



Dombeyopsis obtusa Rhamnus cleburm 



Dombevopsis triviahs Rhamnus sahcifohus 



Dryophyllum subfalcatum Sabalites eocemca 



Equisetum sp. Sabalites montana 



Ficus cockereUi Sequoia? acumuiata 



Ficus crossii Trochodendroides nebrascensis 



Ficus planicostata Typha sp. 



Ficus trinervis Viburnum marginatum 



Grewiopsis saportana Viburnum montanum 



Leguminosites arachioides minor Zingiberites dubius 



Magnoliophyllum cordatum Zizyphus hendersom 



This sarae bed contained the fresh-water raolluscs: 



Unio danai Meek and Hayden 



Goniobasis tenuicarinata Meek and Hayden • ^" 



Sandstone, grayish-white, soft, massive; basal beds with the fresh-water moUuscs: 



Campeloraa nebrascensis nebrascensis Meek and Hayden 



Goniobasis tenuicarinata Meek and Hayden 



Proparreysia holmesiana White 



Tulotoma thompsoni White 



Unio baueri Stanton 



U. priscus Meek and Hayden n. var.? ^° 



Coal bed • • ■ ,••••••.•• u ' j j ' j 



Shale, gray, soft, intercalated with thin lignitic shales and massive to cross-bedded 



soft, gray sandstones. Horizon 30 feet frora base yielded petnfied wood and 



a single brackish-water raollusc : 



Corbula subtrigonalis perundata Meek and Hayden .' ou 



Sandstone, soft, gray, cross-bedded, raassive ■ ^ 



Shale, gray to brown, sandy, and soft, gray raassive sandstone »o 



Shale, gray and yellowish-brown with a few thin, massive, soft, gray sandstones 



chiefly covered in valley •.• • • .• • • • • • • • ,■ 



Shale, gray to brown, with 2 thin lignite layers and thm brecciated yellow sand- 



stone layers at top . „ 



Sandstone, grayish-white, hard, raassive • • ■ • •. 



Shale, gray to brown, with intercalated thin Ugmtic shales and massive gray 



Siiricl^toriGS 



Sandstone, gray, hard, raassive with thin brecciated bed at base 20 



Shale gray to brown, gypsiferous, with a few thin, hard gray sandstone lenses. 



One of these lenses, 15 feet from top, j-ielded the foUowmg species of fossil 



plants (Locality P. 371): 



> Nomenclature of invertebrate genera and speciea foUows Henderson, J., Geol. Soc. Am., Spec. Pap. No. 3. 1935. 



