252 EXPLORATIONS ACROSS THE GREAT BASIN OF UTAH. 



discovery of a formation of Permian affinity before unknown on this continent. 



cannot yet he considered as iullv established, and in re-ard to which the differei 

 investigators have arrived at varying conclusions, but unluckily our line of travel In 

 passed too far north, where only few of the intermediate strata are developed, an 

 where the outcrops are much scattered and covered up bv detritus and Post-Teitiarv d. 



We only find the upper strata of the C 

 tionof the Upper Carboniferous series, as ii 

 has been fully described by Professor Si 

 survey of the State of Missouri. At Leav 

 series of the Coal-Measures of the Missoi 

 crowning the hill back of the fort, while al 

 lowest beds, Nos. 20 to 25 of the series, cr 

 the water-level. In the Missouri report the 



1. 10 feet hard, bluish-gray, ferruginous, subcrystalline, siliceous limesto 



interstratified with brown clay. At Fort Leavenworth it is a compact, 



subcrystalline, gr; ' ' 



up of fossils, mi 



Crinoidea, &c. 

 2 and 3. 6 feet shales. 



4. 3 feet coarse, grayish- white, crystalline limestone. 



5. 15 feet bituminous shale. 



6. 20 feet blue, buff, and gray siliceous, chert}' limestone, interstratified with 



some shale. (It forms a terrace at the hill back of the fort). 



7. 12 feet shale. 



8. 7 feet red, yellowish, and gray friable sandstones. 



9. 4 feet dark, argillaceous limestone. 



10 to 19. 139 feet argillaceous shales, alternating with sandstones and limestones. 



20. 8 feet argillaceous, shaly limestone. 



21. 3 feet thin-bedded, ripple-marked sandstone. 



22. 4 feet bituminous blue shale. 



23. 20 feet hard, fine-grained, bluish-gray and buff ferruginous limestone 



24. 5 feet bituminous shale. 



25. 2 feet hard, compact, dark-blue limestone. 



These rocks continue up the Missouri River until they gradually dip under 

 the water-level, with only a few feet, or none fit all, of higher Carboniferous strata 

 intervening between them and the succeeding and overlying ferruginous sandstone of 

 Cretaceous age. Dr. Hayden saw the last of them, on the Missouri. Borne 50 miles 

 above the mouth of Platte River. At Florence, about 7 miles above Omaha City, 



t is developed 



along 



the 



Mi 



wallow, in the 



3 repo: 



rt i 



ipoi 



enworth, neai 



■ly the 



w 



boh 



wi report is 



expos. 



n\ ; 



th. 



t the lower 





' L< 



-avc 



op out, and o 



nly N< 





>r> ;i 



3 following se 



ction i 



s gi 



ven 



rginous, subc] 



rystalh 





sil: 



clay. At Fo: 



rt Lea^ 



rem 



,von 



d light-buff C( 

 Brachiopoda, 



nored 

 Ftmih 



hm ni l 



