48 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



California. "The Tejon is found most extensively developed 

 in the vicinity of Fort Tejon and about Martinez. From the 

 latter locality it forms an almost continuous belt in the Coast 

 Ranges to Marsh's, 15 miles east of Mt. Diablo, where it sinks 

 under the San Joaquin plain. It has also been found in the 

 same range as far south as New Idria and as far north as near 

 Round Valley, Mendocino County."^^ 



The most southerly Tejon in California known today is 

 found at Pt. Loma.^^ Coming northward the next occurrence 

 is in the Santa Ana Mountains and then at Fort Tejon, ^* the 

 type locality. The Lower Lake, New Idria and Mt. Diablo 

 regions are well covered by Drs. Stanton^^ and Dickerson^^ and 

 it hardly seems necessary to review them in this report. 



The Tejon is very distinct from the Martinez and indicates, 

 perhaps, a more tropical climate, with a fauna that flourished 

 under littoral conditions. 



Some of the later Eocene sediments have of recent years 

 been included in the Tejon group. Among these are the Eocene 

 at Marysville Buttes, Corral Hollow and some of that in the 

 Mt. Diablo region. The late Eocene in the northern part of 

 the State is later than the Tejon at the type locality and can be 

 correlated with the lone along the west face of the Sierras.^' 

 The name Tejon could well be confined to the original forma- 

 tion of that name. 



FORMATIONAL DISTRIBUTION IN THE ArEA 



In general the geology of the Calabasas quadrangle may be 

 divided into three portions. A broad syncline of Monterey 

 sandstone and shale covers the central part and is overlain by 

 alluvium in the San Fernando Valley. Vaqueros sandstone 

 underlies the Monterey sediments and is exposed both to the 

 north and south of it. This large central area is abruptly 

 faulted both north and south, and the older sediments of Eocene 



'=Gabb, W. M., Pal. Cal., vol. 2, preface, p. xiii, 1869. 



"Stanton, T. W., U. S. Geol. Surv., 17th Ann. Rept., pt. 1, p. 1028. 



" For description, see Calif. Acad. Sci. Proc, 4th Series, vol. 5, No. 3, pp. 33-98, 

 pis. 1-11, June 15, 1915. 



" Dickerson, R. E., Fauna of the Martinez Eocene of California, Univ. Calif. Publ. 

 Bull. Dept. Geo!., vol. 8, pp. 89-106, May 13, 1914. 



"Arnold, R., and Hannibal, H., Dickerson on the Tejon Eocene of California, 

 Science, N. S., vol. 39, pp. 906-908, June 19, 1914. Waring, C. A., Elocene Horizons 

 of California, Jour. Geo!., vol. 22, pp. 783-786, Nov.-Dec, 1914. 



