14 CONTBIBUTIONS TO PAL^ONTOLOGY 



Shale, gray, and thinly bedded gray sandstone. Following species of plants col- 

 lected at base: 



Carpites glumseformis Magnoliophyllum cordatum 



Carpites walcotti Myrica torreyi 



Dombeyopsis trivialis Pistacia eriensis 



Dryophyllum subfalcatum Quercus viburnifoHa 



Ficus cockerelli Rhamnus cleburni 



Ficus planicostata Rhamnus sahcifoHus 



Grewiopsis saportana Sequoia? acuminata 



Juglans leconteana Viburnum marginatum 



Magnoha dakotana Zizyphus hendersoni 61 



Shale, dark gray, carbonaceous, thin lignites and gray massive to regularly bedded 



sandstone near base 48 



Shale, gray to brown, sandy, with massive ripple-marked and concretionary gray 



sandstone at top 77 



Shale, gray, sandy, grading upward into thinly bedded, gray sandstone and single 

 coal bed at top. Fossil leaves at base: 



Cinnamomum UnifoUum Rhamnus cleburni 



Ficus planicostata Rhamnus sahcifolius 



Myrica torreyi Trochodendroides nebrascensis .... 38 



Sandstone, gray, regularly thinly bedded 6 



Shale, gray, sandy, with few exposed thin beds of gray, concretionary sandstones; 



hgnite fioat ; mostly covered 216 



Sandstone, grayish-brown, concretionary, with few intercalated shale beds 31 



Shale, soft; mostly covered 30 



Shale, gray, sandy, and intercalated, thin to massively bedded gray sandstones, 



2-f oot coal bed near base 97 



Covered in valley, probably shale 60 



Sandstone, gray, persistent bed, somewhat concretionary 11 



Shale, dark gray, carbonaceous 18 



Sandstone, gray, thinly bedded 35 



Shale, gray to brownish-gray, sandy 20 



Sandstone, gray, soft, thinly bedded 10 



Shale, gray to brownish-gray, sandy 40 



Coal bed 4 



Shale, dark gray, soft 10 



Coal bed 2 



Sandstone, gray, massive 10 



Sandstone, gray, soft, thinly bedded, with concretionary lens near middle. Frag- 

 ments of brackish-water mollusc : 



Ostrea sp 38 



Sandstone, gray, hard, lenticular, concretionary 6 



Shale, gray to brownish-gray, sandy, with few thinly bedded, soft gray sandstone 



layers and intercalated lenses of gray, concretionary sandstones 88 



Shale, dark gray, with 1-foot carbonaceous shales at base and top 15 



Shale, dark gray, medium-bedded; thin concretionary layer at top yielded brackish- 

 water molluscs: 



Melania wyomingensis Meek 



Ostrea glabra glabra Meek and Hayden 



Ostrea sp. 



Unio danai Meek and Hayden 10 



Shale, gray and brownish, sandy 13 



Sandstone, gray, massive, soft, with thin concretionary layer at top 27 



Shale, gray, carbonaceous, to sandy near base, few poorly exposed beds of gray, 



concretionary sandstone, in large part covered 69 



