128 



PROCEEDINGS OF THE ACADEMY OP 



Vertical Section of the Geological Formations of Nebraska Territory, so far as 



determined. 



SoBDinsioNs. 



Localities. 



Light colored indurated days, with oceasional 

 beds of sandstone, conglomerate and whitish lime- 

 stone. Great numbers of mammalian and chelonian 

 remains, with a few fresh-water and land shells. — 

 (Bad Lands of White Kiver.) Beds of clay, sand, 

 sandstone, and lignite, containing groat numbers of 

 fresh-water and land mnUusca, with a few marine 

 or estuary shells; remains of plants, Saurians, Tri- 

 onyx. &c. &c.— (Great Lignite Basin.) Sand, sand- 

 stone, clays, and very impure lignite, with lemains 

 of fresh-water, land, and a few estuary shell, Sauri- 

 ans, fishes, Trionyz, &e. — (Had Lands of Judith.) 



Mauvaises Terres of White 

 River. Great extent of coun- 

 try on both sides of the Mis- 

 souri between Heart and Milk 

 Rivers ; on the Yellow Stone. 

 Bad Land at the mouth of 

 Judith River, &c. &c. 



Gray and yellowish arenaceous clays, and sand- 

 stones, sometimes weathering to a pink color; con- 

 taining Belemnitella hulbnsa, Nautilus Dekayi, Am- 

 monites placenta, A. Inbatus, Scaphites Conradi, 

 Bieulites nvatus, and great numbers of ol her ma- 

 rine moUusca. 



Moreau trading post, and 

 under the Tertiary at Sage 

 and Bear Creeks. 



Vox Hills. 



Bluish and dark gray plastic clays, containing 

 Nautilus Dekayi, Ammonites placenta, Baculites 

 ovatus, and B. compressus. with numerous other 

 marine mollusca, — remains of Mosasaurus. 



Great area about Fort 

 Pierre and along the Mis- 

 souri below there. Under 

 No 5, at Sage and Bear 

 Creeks. Great Bend of the 

 Missouri. Near Milk and 

 Muscle shell Rivers. 



Dark, very fiuf unctuous clay, containing much 

 carbonaceous matter, with veins and seams sele- 

 nite, sulphuret of iron, fish and scales, (local.) 



Lead gray calcareous marl, weathering above 

 to a yellowish tint. Scales and other remains 

 of fishes — Ostrea congesta — passing downwards 

 into 



L.ight gray or yellowish limestone, containing 

 great numbers of Inoceramus problematicus, fish 

 scales, and Ostrea coni/esta. 



Bluffs along the Missouri, 

 below the Great Bend. Ex- 

 tends to Big Sioux River, 

 and occurs along the latter 

 stream. 



Dark gray laminated clay scales and other re- 

 mains of fishes, small Ammonites, Inoceramus pro- 

 blematieusf, Serpula, small oyster-like O. congesta. 



Along the Missouri Bluffs, 

 from ten miles above James 

 River to Big Sioux River. 



Yellowish and reddish friable sandstone, with 

 alternations of dark and whitish clays. Seams and 

 beds of impure lignite, fossil wood, impressions of 

 dicotyledonous leaves; Solen, Pectunculus, Cypri- 

 na. &c. This bed is not positively known to belong 

 to the Cretaceous system. 



Near the mouth of Big 

 Sioux River, and between 

 there and Council Bluffs. 

 Near Judith River? 



as 



Yellow limestone, containing Fusulina eylindrica, 

 Terebratula subtilita, Spirifer Afeusebachanus, Al- 

 lorismn, regxilaris, and other fossils of the coal 

 measures. 



I'orms shoals in the Mis- 

 souri Kiver at De Soto; 15 to 

 20 feet exposed at Council 

 Bluffs, at low stages of the 

 river. 



[May, 



