436 



DILLER AND STANTON — THE SHASTA-CHlCO SERIES. 



tensive investigations in this- field are published in the reports of the 

 California Geological Survey, under the direction of Professor Whitne3^ 

 Mr Gabb, of that survey, recognized four horizons in the Cretaceous, and 

 the names given them by him are noted in the first column of the accom- 

 panying table. The Tejon,-'^ Martinez and Chico were considered to be- 

 long to the Upper Cretaceous. All the Cretaceous below the Chico, com- 

 posed of the beds exposed at Horsetown, on the north fork of Cottonwood 

 creek, in Shasta county, and at a number of points in the Coast range, 

 was grouped together under the name Shasta. 





Gabb,t in Cali- 

 fornia. 



Whitest in Cali- Mler and Stanton, g 

 r.'+ . northern California 

 ^^^^^^^- 1 and Oregon. 



Eocene 





' 



Tejon. 







Chico-Tejon 





Tejon 



Martinez. 

 Chico. 



Shasta 



(Hiatus and uncon- 

 formity. ) 



Upper Cretaceous . . 



Probable place of 

 the Wallala for- 

 mation. 





- 



Shasta-Chico Series. 



' Chico. 





(Hiatus of White. 

 Unconforniitv of 

 Becker.) 



Horsetown. 



Lower Cretaceous . . 



OS - 



' Horsetown 



Knoxville (in- 

 cluding Mari- 

 posa). 



Knoxville. 



Jurassic. .' 



Mariposa . 





MariDosa. II 













The investigations of Conrad, Jules Marcou and Heilprin have shown 

 that the Tejon, instead of being Cretaceous, belongs to the Eocene.^ 



In connection with the investigations of the United States Geological 

 Survey, with special reference to the quicksilver deposits of the Pacific 



*The proper pronunciation of this Spanish word is "tahone." 



tGeol. Survey of California, Paleontology, vol. ii, preface by Whitney, p. xiii. 



JU. S. Geol. Survey, Bulletin no. 82, pp. 184 and 241. 



I Bull. Geol. Soe. Am., vol. 4, pp. 205-224 and 245-256. 



II Hyatt: Bull. Geol. Soc. Am., vol. 5, pp. 395-434; see also Smith : Ibid., pp. 24.3-258. 



*For a more complete reference to the literature of the Cretaceous of the Pacific coast, see U. S. 

 Geol. Survey, Bulletin no. 82, by Dr C. A. White, and Bull. Geol. Soe. Am., vol. 4, pp. 245-249, by 1". 

 W. Stanton. 



