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 220 J. S. DILLER — GEOLOGY OF CALIFORNIA AND OREGON. 



in pointing out recognizable differences. None of the other doubtful species arc 

 represented in any of our collections from Chico localities. 



'•It is therefore safe to say that your collections do not show any commingling 

 of the Chico and Tejon faunas, and I may add that, so far as I have examined them, 

 none of the other collections in the National Museum show such blending."' 



All of the facts yet known indicate that in Oregon and northern Cali- 

 fornia there is a fannal and stratigraphic break between the Chico and 

 the Tejon. 



Pre-Cretaceous Elevation of the Klamath Mountains and Sierra 



Nevada. 



The existence of a large land area in northwestern California and south- 

 western Oregon in early Cretaceous times is clearly indicated by the com- 

 position and distribution of the Cretaceous rocks of that region. The 

 geologic date of the uplift must have been considerably earlier than the 

 beginning of the Shasta-Chico epoch in order to allow the secular disin- 

 tegration of the surface rocks to furnish the Cretaceous sediments for the 

 invading sea. 



Since the writer's paper on the geology of the Taylorville region was 

 published, our knowledge of the distribution of the Jura-Trias and Car- 

 boniferous in northern California has been considerably extended, and. 

 as this distribution has an important bearing on portions of this paper, 

 it is necessary to record it here. 



A large number of fossils were collected by the writer and James Storrs 

 on and near Pit river by the western arm of the Great bend, and at many 

 places near Cedar creek and Halcombs, on the toll and stage roads be- 

 t ween Redding and Burney valley. The areal geologic work done at that 

 time is shown in the Bend and Cedar formations in the northwestern 

 corner of the Lassen peak atlas sheet, a preliminary edition of which 

 i» now in proof. The fossils were all examined by Professor A. Hyatt. 

 and in the descriptive text accompanying that sheet his conclusions con- 

 cerning the age of the rocks are stated. Both the Jurassic and Triassic 

 of the Taylorville region are well represented in Pit river valley and add 

 another strong argument, showing that the Klamath mountains of north- 

 western California are composed in large part of the same rocks as the 

 Sierra Nevada, f 



Along the western side of the Sacramento valley, near the basin on 

 the Humboldt trail eight miles west of Pettyjohns, in Tehama county, 



* Almost thirty species have been identified from the Tejon of Oregon and Washington. 



t Mr Harold W. Fairbanks, who has published an article entitled "Tin- pre-Cretaceous Age of the 

 Metamorphic Rocks of the California (cast Range" (Am. Geologist for March, 1892, vol. ix,"pp, 

 153-166 : also for Feb., 1893, vol. xi. pp. 69-84), kindly call f. 1 my attention to a number of new locali- 

 ties in the Pit river region from which he had recently collected i'"s>il<. 



