wHiTE.l CEETACEOUS FOSSILS OF MORRISON AND GOLDEN CITY. 197 



have existed during 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 the doubt upon this 

 point that was at one time felt in consequence of finding Cretaceous fossils 

 above a bed of coal there. At all the localities which 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-supposed presence 

 of a bed of coal in the Fox Hills strata at Ralston Creek would, if true, 

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

 physical conditions in regions that are now respectively east and west of 

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

 be always borne in mind that this great physical continental feature did 

 not then exist. 



The following list of fossils obtained from Cretaceous strata near the 

 base of the Eocky Mountains, between Bear and Ealston Creeks, a dis- 

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

 has been collected in part by Mr. 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- 

 ported by Mr. Lakes, presently to be mentioned. 



LIST OF CRETACEOUS FOSSILS FROM THE VICINITY OF GOLDEN CITY 

 AND MORRISON, COLO. 



Fox Sills Group. 



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



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



Morrison. 



3. Inoceramus oblongus Meek. Bear Creek, near Morrison. 



4. Nucula planimarginata Meek & Hayden. Eear Golden City. 



5. Xucula cancellata Meek & Hayden. Near Golden City. 



6. Gardium speciosum Meek & Hayden. Bear Creek, near Morrison. 



7. Tellina scitula Meek & Hayden. Bear Creek, near Morrison. 



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



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



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



11. Lunatia subcrassa Meek & Hayden. Bear Creek, near Morrison. 



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



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



14. ticapliites mandanensis Morton sp.? Bear and Ealston Creeks. 



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



Colorado Group. 



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



17. Inoceramus 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- 



