lOTE ON SOME FOSSILS FROM NEAR THE EASTERN BASE OF 

 THE ROCKY MOUNTAINS, WEST OF GREELEY AND EVANS, 

 COLORADO, AND OTHERS FROM ABOUT TWO HUNDRED 

 MILES FARTHER EASTWARD, WITH DESCRIPTIONS OF A 



FEW NEW SPECIES. 



By F. B. MeeiCj Paleontologist. 



The fossils collected during the past summer ou Cache La Poudre 

 Eiver, six to ten miles west of Greeley j from five miles below Platte- 

 ville, on Platte River ; from four miles west of Evans, on. Thompson 

 Eiiver ; and at the junction of Little and Big Thompson Elvers, some 

 three or four miles farther westward, are all so obviously from the same 

 horizon, and the localities are so near each other, that they may be all 

 noticed together. In the first place, however, the following list of the 

 species collected at these localities will be given : 



1. Salymenites. 



2. Avicula {Oxytoma) JSfehrascana, E. & S. 



3. JSfucula cancellata, M. & H. 



4. JSfucula plauiniarginata., M. &. H. 



5. Yoldia JEvansi, M. &. H. 



6. Veniella humilis, M. & H. 



7. Tancredia Americana, M. & H.* 



8. Bphceriolaf ohliqua, sp. u. (See end of this note.) 



9. Cardium speciosum, M. & H.* 

 3 0. Tellina scittda, M. & H. 



11. Mactra Warrenana, M. & H. 



12. Mactra formosa, M. & H.* 



13. Mactra alia, M. & H.* 



14. Mactra gracilis, M. & H., with several other undetermined bivalves. 



15. Dentalium. 



16. OylicJma scitula, M. & H. 



17. Lunatia Moreauensis, M. & H. 



18. PiestocJieilus ScarhoroiigM, M. & H. 



19. Anclmra. 



20. Ammonites lobatus, Tuomey. 



This group of species, coming, as the specimens evidently did, all from 

 the same horizon, is of some interest, because it gives us the first clew 

 we have had in regard to the exact position in the Cretaceous section of 

 a rock at the mouth of Judith Eiver, ou the Upper Missouri, with rela- 

 tion to the other subdivisions of this series there.* 



The rock alluded to has not yet been recognized at any other locality 

 in the Upper Missouri country than that mentioned ; and as it does not 

 there occur, so far as known, in association with any of the other beds 

 belonging to well-determined horizons of the Cretaceous of that region, 



* I do uot allude here to the brackish-water beds at that locality, in regard to the 

 exact age of which there have been some doubts, but to a well-defiued Cretaceous 

 rock, containing BacuUtes, luoGeramus, and other Cretaceous types of fossils. 



