18 CONTRIBUTIONS TO PAL^ONTOLOGY 



Sandstone, gray, fine-grained, cross-bedded 4 



Shale, sandy, gray ; mostly covered 53 



Sandstone, gray, cross-bedded, fine-grained, quartzitic, with the f ollowing brackish- 

 water species of molluscs : 



Anodonta? sp. 



Corbula subtrigonalis perundata Meek and Hayden 



C. subtrigonalis subtrigonalis Meek and Hayden 3 



Shale, sandy; mostly covered 16 



Coal bed 1 



Shale, grayish-brown, papery 12 



Sandstone, grayish-brown, thinly bedded, friable 5 



Sandstone, gray, quartzitic, resistant, thinly bedded 3 



Shales, gray, sandy, containing gypsum and numerous shells of the brackish-water ■ 

 form: 



Ostrea sp 12 



Sandstone, gray, quartzitic, fine-grained, thinly bedded, the bedding surfaces ripple- 



marked 5 



Shale, grayish-brown, sandy 50 



Shale, gray, papery, with shells of the brackish-water form: 



Ostrea sp 20 



Sandstone, grayish-brown, fine-grained, crqss-bedded 10 



Sandstone, gray, fine-grained, quartzitic 6 



Shale, gray, sandy, with shells of the brackish-water form: 



Ostrea sp 10 



Sandstone, grayish-brown, cross-bedded, friable 3 



Shale, gray, sancly, partly covered 40 



Coal bed, poorly exposed 2 



Shale, gray, sandy, mostly covered 14 



Fox Hills formation: 



Sandstone, grayish-brown, fine-grained, friable, massive, with 2-foot beds of thinly 



cross-bedded, gray sandstone in middle and at base 14 



Shale, gray, sandy, and irregular lenses of gray, soft sandstone 20 



Sandstone, gray, lenticular, resistant, thinly cros.s-bedded 2 



Sandstone, soft, shaly, gray, interbedded in thin irregular layers with darker grayish- 



brown sandy shales, in part covered 178 



Sand.stone, gray, massive, irregularly bedded, with large concretionary masses of 

 harder, almost quartzitic, gray sandstone, intcrbedded with some gray, sandy 

 shale. Horizon 6 feet from top yielded the foUowing marine species: 

 Cardium whitei Dall M. alta Meek and Hayden 



Legumen planulatum Conrad Sphenodiscus lenticularis (Owen) 



Mactra warrenana Aleek and Meek 



Hayden TeUina scitula Meek and Hay- 



M. nitidula Meek and Hayden den 76 



Sandstone, soft, gray, and shales, gray, sandy, mostly covered in valley. Thick- 

 ness not measured. 



Craig, Coloeado, Localities P. 375 and P. 376 

 In this vicinity, dry gullies draining into the Yampa valley expose a discon- 

 tinuous section from the massive sandstones here included in the Fox Hills forma- 

 tion up into the lower beds of the Medicine Bow formation. The leaf-bearing 

 horizons in the basal beds of the latter formation are located as follows: 



Locality P. 375: dry gully 200 yards west of the center of sec. 32, T. 7 N., 

 R. 90 W., i mile W. 18° N. of the old Kimberly coal mine. 



