174 FV. Hayden on the Cretaceous rocks of the West. 
and partly from an old digging, I obtained a similar section. 
At still another point I noticed a similar exposure, leaving ne 
doubt of the character and order of arrangement of the materials 
composing this formation. 
“The character of the vegetation obtained from the sandstone 
of the shaft and elsewhere, resembling the leaves of Salix, Pop- 
lar, Liriodendron, Tupelo, etc., induced me to refer this forma- 
i the Cretaceous period. A single indistinct shell was 
the only animal fossil I was able to obtain. In aspect the cal- 
careous concretions are similar to those from the Cretaceous 
formation of the upper Missouri; and the green argillaceous clay 
is likewise similar.” 
At Redwood Falls, also, Prof. Hall obtained another section 
University of Bologna, Italy, made an excursion up the Missourt 
river to a point near the mouth of thé Big Sioux. It seems 
* Reconnaissance géologique au Nebra: r Jules M : Extrait du Bulle- 
tin de la Société Géologique de France, a & aa p- 1a, Jo 18th, 1864, and 
Les Phyllites Crétacees du Nebraska, par MM. les Prof. J. Capellini et O. Heels 
tirage a part des Mémoires de la Société Helvétique des Sciences Naturelles. 
