wHii-E.l CEETACEOUS FOSSILS OF MORRISON AND GOLDEN CITY. 197 



have existed dm-iiig either of those epochs within what are now the limits 

 of Colorado, east of those mountains. The foregoing explanation of the 

 phenomena observed on Ealston Creek removes tlie doubt upon this 

 point that was at (me time felt in consequence of iinding Cretaceous fossils 

 above a bed of coal there. At all the localities w hicli I have visited in 

 Eastern Colorado the strata of the Colorado, Fox Hills, and Laramie 

 Groups all indicate great uniformity of condition of deposition through- 

 out each epoch respectively, to which rule the formerly-sui)posed i)resencc 

 of a bed of coal in the Fox Ilills strata at-Iialston Creek would, if true, 

 have been an exception. A comparison of these indications of former 

 physical conditions in regions that are noAV res|iectively east and west of 

 the Kocky Mountains, will be made on subsequent pages, but it should 

 be always borne in mind that this great i)hysical continental feature did 

 not then exist. 



The following list of fossils obtained from Cretaceous strata near the 

 base of the Kocky Mountains, between Bear and Kalston Creeks, a dis- 

 tance of about twelve miles and including the vicinity of Golden City, 

 has been collected in part by Mt. A. Lakes and Capt. E. L. Berthoud, 

 but I also visited all the localities in person. The strata of the Bed 

 Beds, the Jurassic and Dakota Groups of this district have been long 

 and carefully searched for invertebrate fossils by both these gentlemen, 

 but without success, except the discovery of a single shell which is re- 

 I)orted by Mr. Lakes, presently to be mentioned. 



LIST OF CREi'ACEOUS FOSSILS FROM THE VICINITY OF GOLDEN CITY 

 AND MORRISON, COLO. 



Fox Rills Group. 



1. Pteria Ungniformis Evans & Shumard. Bear Creek, near Morrison. 



2. Fteria (Pseudoptera) fibrosa Meek & Hayden. Bear Creek, near 



Morrison. 



3. Inoceramiis ohlongvs Meek. Bear Creek, near Morrison. 



4. Kucula planimarginata Meek & Hayden. IsTear Golden City. 



5. Nucula cancellata Meek & Hayden. Kear Golden City. 



6. Cardinm specioswn Meek «& Hayden. Bear Creek, near Morrison. 



7. Tcllina scitula Meek & Haydenl Bear Creek, near Morrison. 



8. Mactra holmesi Meek sp. Bear and Ealston Creeks. 



9. Pacliymya f herseyi White. Bear Creek, near Morrison. 



10. Bentalium gracile Hall & Meek. Bear Creek, near Morrison. 



11. Lnnatia siibcrassa Meek & Hayden. Bear Creek, near Morrison. 



12. Baculites ovatns Say. Bear Creek, near Morrison. 



13. Scaphites nodosus Owen, Bear Creek, near Morrison. 



14. Scapliites mandanensis Morton sj)."? Bear and Ealston Creeks. 



15. Placenticeras placenta var. Bear Creek, near Morrison. 



Colorado Group, 



16. Ostrea congesta Conrad. Bear Creek, near Morrison. 



17. Inoceiamus deformis Meek. Bear Creek, near Morrison. 



18. Inoceramus problematicus Schlotheim. Bear Creek, near Morrison. 



NOTES ON THE FOSSILS FROM THE VICINITY OF GOLDEN CITY' AND 



MORRISON. 



The fossils obtained from the strata of the Fox Hills Group at Bear 

 Creek were found at two horizons or in two layers j one about two hun- 



