12 



University of California Publications in Geology t VoL 11 



Fontaine 25 was inclined to refer the plant remains to the lowest 

 Cretaceous, but believed it possible that they might be uppermost 

 Jurassic. 



Knowlton, 20 reporting to Nomland in 1915, stated that the plant 

 remains indicated that these beds could not possibly be younger than 

 the Jurassic, and that they were probably not younger than the Middle 

 or Lower Jurassic. 



Evidence as to the Age op the Franciscan Group Based 

 on Work in Oregon 



The rocks in southern Oregon, that appear to be equivalent to the 

 Franciscan group of California, have been called the Dothan series by 

 Diller. 27 These rocks were first referred to the Franciscan group by 

 Professor Louderback. 28 



In this region, sedimentary formations of earlier periods are better 

 developed than in the Coast Ranges of California, and there would 

 appear to be an excellent opportunity here to settle the question of 

 the age of the Franciscan group. Here again, however, the results 

 are contradictory. 



Diller 29 gives the following correlation between the formations of 

 the Klamath Mountains and other formations in California. 



Aucella crnssicollis. 



A ucella piochi \ 



I 

 I 



Aucella e> ringtoni • 



Paleozoic. Paleozoic. 



25 20th Ann. Rep., U. S. Geol. Surv., pt. 2, pp. 338, 339, 1896. 

 2« Nomland, J. O., unpublished manuscript. 



27 Diller, J. S., Am. Jour. Sci., vol. 23, p. 401, 1907. 



28 Louderback, G. D., Jour. Geol., vol. 13, p. 514, 1905. 



-'■> Diller, J. S., Bull. Geol. Soc. Am., vol. 19, p. 369, 1908. 



Myrtle.' 



Myrtle. 



Dothan. 



Galice. 



Shasta flora. 



■Jurassic flora. 

 1 I 



Correlai ion 



not fully 

 established 



Horsetown. 



Knoxville. 



Franciscan. 



(?) 



Mariposa (re- 

 garded=Monte 

 de Oro.) 



Lower Cretaceous. 



Jurassic. 



