484 



REPORT OF NATIONAL MUSEUM. 1904. 

 Table of the formations of Mississippi. 



Name of group. 



Principal materials. 



Fossils found 



Alluvium Soils, .sand bars, etc 



Second bottom " Hominocks" 



Yellow loam Brown and yellow brick clays . 



Bluff formation j Calcareous silt 



Orange sand I Sands, pebbles clays 



( !< »ast Pliocene '.' ! Black fetid clays 



Grand Gulf group 

 Vicksburg group . 



Light-colored clays; white 

 sandstones. 



Claiborne group. . 



Marls and limestones 



Lignitic I Black clays 



Jackson group Marls and soft limestones 



Lignitic Black clays 



Marls and limestones 



Siliceous sandstones 



Northern lignitic ' Black and gray clays; yellow 



sands. 



Ripley group Marls and limestones; sandy . 



Rotten limestone Soft chalky likestone, clayey. 



Tombigbee sand Greenish micaceous sands 



Eutaw group ; Dark-colored clays; sand 



Limestone Fetid, crystalline limesti >ne. . . 



Sandstone Siliceous sandstone and chert . 



Black slate ; Hydraulic limestone 



Living plants and animals. 



(?) 



(?) 

 Terrestrial, part extinct. 



These of underlying forma- 

 tions. 



Living marine animals, liv- 

 ing trees. 



Plants, partly extinct? lignite. 



Marine animals. 



Plants, lignite. 



Marine animals. 



Plants, lignite. 



Marine animals. 



Marine animals. 



Plants, partly extinct; lignite. 



Marine animals. 



Marine animals. 



Marine animals; plants, ex- 

 tinct; lignite. 



Marine animals. 



Marine animals. 



(?) 



The Orange sand of Safford was shown 

 to characterize the greater part of the sur- 

 face of the State, and he regarded it as 

 proved beyond question that its deposition 

 had taken place in floating- water, the gen- 

 eral direction of the current of which was 

 from north to south. By far the greater 

 portion of the State was shown to be occu- 

 pied by deposits of Tertiary age, leaving out 

 of consideration the strata of Orange sand 

 which covered a large part of the actual 

 surface. 



Hilgard's work had an agricultural bear- 

 FiG.68.-EugeneWaidemarmigard. - m g an( j ? ag mav j )e re adily inferred from 



the work of more recent years both in the Mississippi Valley and 

 California, had to do largely with soils, their original physical and 

 chemical constitution, and methods of rejuvenation. 



