192 PROCEEDINGS OF THE CORDILLERAN SECTION 



sence of the regular officers, Dr. B. L. Clark was elected temporary 

 chairman and G. D. Loiiderback Acting Secretary. 



ANNOUNCEMENTS 



The Acting Secretary reported that, due to the absence of the Secre- 

 tary in Central America, the chairman had appointed him Acting Secre- 

 tary to prepare the program and make arrangements for the Pasadena 

 meeting. 



It was voted that the Friday meeting should be called at 9.30 a. m., in 

 Room 205, Pasadena Hall. It was also voted to postpone the business 

 meeting to Friday noon. 



The following paper was then presented : 



8TRATIGBAPHIC A^D PAUNAL RELATIONSHIPS OF THE MEGANOS GROUP, 



MIDDLE EOCENE 



BY BRUCE L. CLARK 



(Abstract) 



The data presented in this paper give the results of the writer's investiga- 

 tion on this newly recognized division of the Eocene since the publication of 

 the first announcement of its discovery.^ 



The most important points brought out in the paper are : 



1. Beds referred by the writer to the Meganos group have a wide distribu- 

 tion throughout the State. In all the principal sections they lie unconform- 

 ably below beds containing a typical Tejon fauna. The principal general 

 Eocene localities studied in the State are on the south side of Mount Diablo, 

 north of Coalinga, the type section of the Tejon, at the south end of the San 

 Joaquin Valley, and the Simi Valley, which is thirty miles northwest of the 

 city of Los Angeles. In all these localities, a maximum distance of about five 

 hundred miles apart, beds of Tejon age were found unconformably above those 

 referred to the Meganos. In some localities the difference in dip between the 

 Meganos and the Tejon is more than fifteen degrees and in almost every case 

 is accompanied by a marked difference in strike. 



2. The faunal evidence supports the conclusion that there was a big time 

 hiatus between the deposition of the beds of these two horizons. 



3. The writer's conclusion is that the marine beds in the foothills of the 

 Sierra Nevada, as at Table Mountain, near Oroville, which beds have been 

 referred to the lone formation — the SiphonaUa sutterensis zone of Dr. R. E. 

 Dickerson, supposed by him to represent the uppermost Tejon— belong to the 

 Meganos epoch of deposition. The lone as originally described is undoubtedly 

 a composite group. 



Discussion 



Discussion by W. D. Smith, Buell, and B. L. Clark was particularly 



directed to comparisons between California and Oregon stratigraphy and also 



^ Meganos Group, a newly recognized division in the Eocene of California. Bull. Geol. 

 Soc. Am., vol. 29, 1919, pp. 281-296. 



