NOTES ON THE MARINE SEDIMENTS OF EASTERN 



OREGON. 



The marine sediments of eastern Oregon comprise beds rang- 

 ing from the Carboniferous to the Upper Cretaceous. The Car- 

 boniferous and Triassic have been described by Waldemar Lind- 

 gren,'' the Jurassic by Alpheus Hyatt, ^ and the Cretaceous by 

 John C. Merriam,3 c. A. White,* W. M. Gabb.s J. S. Diller and 

 T. W. Stanton,^ and Professor Blake. ^ The present paper is 

 written to demonstrate the Carbonife'rous age of the limestone 

 of Baker county, and to describe new localities of the Paleozoic 

 and the Mesozoic in eastern Oregon. 



The Carboniferous. — Lindgren^ has described and mapped a 

 great series of metamorphic argillites and limestones in Baker 

 county, which he refers with doubt to the Carboniferous. Fos- 

 sils are scarce in these rocks, the only ones reported by Lindgren 

 being some round crinoid stems. 



In the early eighties some fossiliferous limestone was sent to 

 Professor Condon from Powder river, below Baker City. Profes- 

 sor Condon recognized the fossils as Producti, and hence suffi- 

 cient to prove the Carboniferous age of the Baker county lime- 

 stone that Lindgren maps as Carboniferous. Recently, through 

 the help of Mr. H. G. Moulton, Mr. N. C. Haskell, Mr. Thomas 

 Burke, and Mr. L. W. Nelson, of Baker City, the position of the 



' "Gold Belt of the Blue Mountains," Twenty -second Annual Rept. U. S. Geol. 

 Surv., Part II, pp. 577-82, 1902 ; Science, Vol. XIII, pp. 270, 271, 1901. 



*" Trias and Jura in the Western States," Bull. Geol. ^c^. ^w., Vol. V, pp. 418-20, 

 1894. 



3" Contribution to the Geology of the John Day," Bull. Dep''t Geol., Univ. of 

 Calif., Vol. II, No. 9, pp. 280-85. 



''Bull. 33, U. S. Geol. Surv., p. 19 ; Bull. 15, pp. 31, 8 ; Btill. U. S. G. S. Terr., 

 Vol. II, p. 359- 



^Paleon. Calif, Vol. II, pp. 138, 181. 



^ Bull. Geol. Soc. Afn., Vol. IV, pp. 214, 452, 453. 



TAm.Jour.Scfence, 1867, p. I18. 



^ Twenty-second Annual Rept. U. S. Geol. Surv., Part II, p. 578. 



224 



