127 



Minerals and geological specimens — Continued. 



Indurated clay, yellow Deaatur. .. 



Ferruginous sandstone, with striated bivalves and 



Oytherea arenaria . Big Sioux. 



Indurated clay, with dicotyledonous leaves do. 



— do sand, fine, yellow, with leaves of salix ..| do. 



Ferruginous sandstone Mouth of Iowa creek 



, do do fine grained, with im- 

 pressions of dicotyledonous leaves Mouth Big Sioux 



, do do with Solen dacotahenm do 



Lignite under 809 do 



Silicified wood, bored by teredo Big Sioux 



do do Blackbird hills 



, do do - — Smoky Hill fork 



do do i Republican fork 



Coarse, ferruginous sandstone, with leaves of 

 Credneria Smoky hill 



Sandstone, very ferruginous do 



Cellular, ferruginous, rock do. 



Formation No. 2. 



Masses sulphuret iron, with sulphate Mouth of Vermillion 



Crystallized do do do 



do gypsum do 



do do ! do 



do in plates ' do 



Large crystals selenite in black clay do. 



, do do do do. 



Ferruginous shale, with remains of fishes do. 



do shell limestone do. 



Yellow clay, with gypsum _ do. 



Conglomerate, with green silieious pebbles do. 



do with shark's teeth do. 



Gray arenaceous limestone, with Cytherm orbiculala. do. 



do do with fish scales do. 



Dark gray indurated clay, with fish scales , 



Arenaceous limestone, (•234,) with Serpula , 



Conglomerate, with fish teeth 



Arenaceous limestone, gray, with Inoceramns proble- 

 m&ticus I Black hills, west 



Black hills, east base 



Dixon's bluffs - 



do , 



Formation No. 3. 



Big Sioux 



Mouth James river. 



do 



do 



Durions hills . 



Soft, yellow, limestone, with Fnoceramus prohlematicxis 



Gray marl, with Oatrea crnvjeata, and fish remains 

 (base of No. 3) , 



do do 



Scale of Cydocladus in 242 .. . 



Fibrous carbonate of lime, with Ostrea congesta at- 

 tached to surface 



Yellow marl [ do 



do I Bijoux hills 



do lighter I do 



Crystalline carbonate of lime, seams in marl I do 



do greenish in marl do 



Black plastic clay, upper part of No. 3 Near Bijoux hills 



Shale, argillaceous, with fish remains over 250 : do 



...do calcined by combustion of 250. | do 



Formation No. 4. 

 Blue clay, with Ptgclwceras mortoni Great bend of Missouri 



