DISTINCTION OF TPIE CHICO AND TE.TON. 219 



Lindgren has recognized the Tejon in the Sacramento valley as far 

 northward as Marysville buttes * In the Coast range Whitney, on Gabb's 

 observation, reports the Tejon nearly as far northward as Round valley, 

 Mendocino county* Similar coal-bearing strata containing fossil leaves 

 have been observed by the present writer at Hyampome, Cox's bar and 

 Redding creek basin, in Humboldt and Trinity counties, but the evidence 

 that these strata are really Tejon is not convincing ; they are rather more 

 probably Miocene. With the exception of the locality at Marysville 

 buttes, no molluscan fossils of Tejon age have been found in northern 

 California, and it has generally been regarded as absent. 



In Oregon, however, the case is very different. The Tejon, well char- 

 acterized by an abundance of marine fossils, is represented by at least 

 2,000 feet of strata. Professor Condon has reported it at Cape Arago by 

 Coos bay, and at Albany. Dr C. A. White has recognized it at Astoria, 

 where it has since been studied by Dr W. H. Dall. Profess* >r ( !< mdon called 

 my attention by letter to an excellent exposure of fossiliferous Eocene on 

 the South fork of the north Umpqua, where Mr Will Q. Brown and the 

 writer have made several collections. At least 1,000 feet of Eocene si rata 

 are there exposed. They contain throughout abundant shells of Cardiia 

 planicosta, with other fossils, and rest directly upon an irregular surface 

 of metamorphic rocks. From this point the Eocene beds have been 

 traced southwestward nearly to Coos bay, and fossils have 1 teen collected 

 at Cleveland, Lookingglass, Olalla and Table mountain. At the last two 

 localities they rest on the upturned edges of the Shasta-Chico series. 

 The unconformity at the base of the Tejon group in Douglas county, 

 Oregon, is in some cases conspicuous and in all eases well defined, 

 and it appears that the Shasta-Chico series was not only folded but 

 considerably eroded before the beginning of deposition of the Tejon in 

 that region. 



With such a physical break, faunal continuity between the Chico and 

 the Tejon of Oregon could hardly be expected ; but, to test this point as 

 far as possible with the collections now at hand, I requested Mr Stanton 

 to carefully examine the collections of Tejon from Oregon and Washing- 

 ton for Chico species. In response Mr Stanton sent lists of all the species 

 collected at a number of localities, and remarks :f 



" You will notice that there are a few species among them that have been re- 

 ported from both the Chico ami the Tejon. For example, Pholadomya namta, < '//- 

 lichna costata ami Turriiella chicoenm. There are also some others that closely re- 

 semble Chico species, but which I believe to be distinct, such as Mactra ashburneri 

 and DentaMum stramineum. We have the two species last named from Chico locali- 

 ties, and, on direct comparison with the related Tejon forms, there is no difficulty 



*Geol. Survey of Cal., Fa]., vol. ii, p. xiii. 

 f January '.>, 1893, 



