228 CHESTER WASHBURNE 



They are certainly Mesozoic, however, and I think Jurassic rather than Cre- 

 taceous. 



The Kiioxville Cretaceous. — On petrographic and stratigraphic 

 grounds Merriam^ has recognized the Knoxville and the Chico 

 near Mitchell, Wheeler county. His conclusions are supported 

 by the evidence of the following fossils collected by Professor 

 Condon in 1863 from various places between Mitchell and the 

 John Day: 



Olcostophanus sp. 

 Nautilus texanus {?) Shumard. 

 Acteo7iella oviformis Gabb. 

 Trigonia leana Gabb. 



There are also two ammonites, one of them probably Scaphites, 

 that the writer cannot classify. The first-mentioned form is a 

 fragment that seems to be closely related to 0. Miitabilis Stan- 

 ton, a characteristic Knoxville species.^ The other three spe- 

 cies probably came from the strata that Merriam regarded as 

 Chico. An interesting problem in Cretaceous geography will 

 be solved when it can be proven that the Knoxville is present 

 or absent in eastern Oregon, and it is to be hoped that someone 

 will secure such proof. No Aucellae have yet been found there. 



The Chico. — The first record of the Chico in eastern Oregon 

 was made by Whitney ,3 who published some fossils collected by 

 Gabb on Crooked river. In the same year Blake"* described a 

 Turrilites and other fossils that Professor Condon had collected 

 at the same place. Since then several writers ^ have referred to 

 the Chico in eastern Oregon, from knowledge that they gained 

 from Professor Condon's Spanish Gulch and Crooked river fos- 

 sils. Recently Merriam^ has made large collections at the Span- 

 ish Gulch locality. 



On upper Beaver creek John Platts and the writer made a 



^Bull. Dept. GeoL, Univ. of Calif., Vol. II, p. 285, 1901. 



= See Stanton, Bull. U. S. Geol. Surv., No. 133, pp. 17, 18, 27, 77. 



^ Proc. Cat. Acad. Nat. Sci., Vol. Ill, p. 309, January, 1867. 



^ Am, Jour. Sci., July, 1867, p. 118. 



5 See footnotes on first page of this paper. 



^Bull. Deft Geol., Univ. of Calif ., Vol. II, pp. 418-20. 



