130 STANTON & KNOWLTON— LARAMIE AND RELATED FORMATIONS. 



5. Brownish and gray sandstone, in alternating bands of, massive and 



thin-bedded 130 feet. 



6. Massive light-colored sandstone 100 " 



7. Clay 5 " 



8. Sandstone 10 " 



9. Clay 8 " 



10. Massive light-colored sandstone 60 " 



11. Lignite and clay ,., 15 " 



12. Shaly sandstone 5 " 



13. Massive nearly white sandstone, with brown concretions 40 " 



14. Clays with concretions containing Ostrea glabra, Corbula subtrigonalis, 



Anomia, and Corbicula cytheriformis (Laramie brackish- water fossils) . 20 " 



15. Similar clay with lignite seams 15 " 



16. Sandstone with bands of clay 20 " 



17. Clay 25 ' ' 



18. Sandstone . ... . ! 10 " 



The beds to this point all have about the same dip of 20 degrees, and 

 going up through the section northwestward the dips continue high, 

 though gradually decreasing through similar alternating beds of clay 

 and sandstone, with an aggregate of about 1/200 feet. This portion of 

 the series was not found sufficiently well exposed to furnish a detailed 

 section. 



The second section, including the same horizons, is at the place de- 

 scribed by Mr Hatcher,* in a gulch emptying into Buck creek near the 

 old corrals used by cattlemen on their round-up. Here, as before, the 

 Fort Pierre shales are fossiliferous, but very imperfectly exposed. The 

 transition is gradual through alternations of sandstone and shales into 

 the massive sandstones of the Fox Hills, with which the section begins. 



1. Massive yellowish-gray friable sandstone, with concretions contain- 



ing Veniella humilis, Sphxriola, Gervillia subtortuosa, and other Fox 



Hills fossils 100 feet. 



2. Thin-bedded brown and gray shaly sandstone < 130 



3. Massive light-gray soft sandstone 60 



4. Brown shaly sandstone 5 " 



5. Soft, somewhat sandy, clay shales 30 " 



6. Massive light-colored sandstone 75 " 



7. Brown sandstone, more thinly bedded and somewhat more argilla- 



ceous than number 6 25 " 



8. Yellowish massive sandstone, with large brown concretions 20 " 



9. Massive light-colored sandstone like number 6 60 u 



10. Sandy clays, with beds of lignite not well exposed ; a few fossil plants 



were collected about this horizon a short distance from the line of 



the section 25 " 



11. Alternating sandstones and clay shales in beds a few feet thick, not 



well exposed 275 



* Am. Jour. Sci., 3d ser., vol. xlv, pp. 138, 139. 





a 



