no 



erally closely allied to the cretaceous species of the Old World. 

 From the limited study I have given them, I have referred them to 

 the followJDg genera : 



Sphe/iopteris, 



Abieiites, 



Acer, 



Fagus, 



Fopulus, 



Cornus, 



Liriodendron. 



Fyrus, 



Alnus, 



Salix, 



Magnolia, 



Credneria, 



Ettingshausinia , 



"Of these the last two are exclusively cretaceous and highly 

 characteristic of that formation in Europe." 



From the evidence which we have given, we think we are war- 

 ranted in regarding our No. 1 as cretaceous, and probably of lower 

 cretaceous age. This matter will be discussed more fully hereafter. 

 The red sandstone at the mouth of Big Sioux is the type of our No. 1, 

 and its relations to the sandstone strata, near the Judith river, are 

 not positively determined. 



Table showing the stratigraphical position of the cretaceous fossils hitherto 

 identified from Nebraska Territory. 



Formations in ascending 

 order. 



1. GENUS CALLIANASSA. 



1 . Callianassa Danai, Hall & Meek 



2. GEN. BELEMNITELLA. 



9. 

 10. 



2 . Bdemnitella mucronaia, Sclilotheim 



3. Belemnitella'i ftalhaser, Meek & Hay den , 



3. GEN. NAUTILUS. 



4. 'Nautilus Be Kayi, Morton 



4. GEN. AMMONITES. 



5. Ammonites placenta, De Kay 



6. Ammonites lobatus, Tiiomy 



7 . Ammonites c/fialus, wen 



Ammonites complexus, Hall & Meek 



Ammonites percarinatus, Hall & Meek 

 A'nmonites llaUi, Meek & Hayden.-.. 



5. GEN. TUNILITES. 



11. Turrililes Nebrascensu, Meek & Hayden 



12. Turnlites Cfteyennensis, Meek & Hayden 



13. Turrililes umbilicatus, Meek & Hayden 



14. Turrilites {Helkoceroi) cockleaius, Meek & Hayden. 



