368 University of California Publications in Geology [Vol. 9 



correlation, distribution and stratigraphy of the upper Eocene of 

 California. 



The first recognition of Eocene on the Pacific Coast was made by 

 Conrad, 1 and was based upon the fossils contained in a boulder sent 

 by Blake from Canada de las Uvas. 



Conrad described the following new species: Cardium linteum, 

 Dosinia alta, Meretrix uvasana, Meretrix calif orniana, Crassatella 

 uvasana, Mytilus humerus, Volutilithes calif or nica, Busyconf?) blakei 

 =(Perissolax blakei), Clavatula(f) calif or nica— (Fusinus calif or: 

 nicus), Natica alveata=( Amauropsis alveata), and he identified Ven- 

 ericardia planicosta, Natica aetites(f), Natica gibbosa and Crassatella 

 alta of the Claiborne Eocene. 



Gabb 2 in 1864 described many species which Captain Horn col- 

 lected from the vicinity of Canada de las Uvas and referred the 

 strata yielding this fauna to Division B of the Cretaceous. Whitney 3 

 in the next volume described the type locality of the Tejon-Eocene 

 as follows : 



The Tejon group . . . the division B of Palaeontology, vol. 1, is peculiar 

 to California. It 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 Marshs', 15 miles east of Mount 

 Diablo, where it sinks under the San Joaquin plain. It was also discovered 

 by the different members of the survey at various points on the eastern 

 face of the same range as far south as New Idria, and in the summer of 

 1866 by Mr. Gabb in Mendocino County, near Round Valley, the latter 

 locality being the most northern point at which it is as yet known. . . . 



This group contains a large and highly characteristic series of fossils, 

 the larger part peculiar to itself, while a considerable percentage is found 

 extending below into the next group (Martinez). 



For several years the controversy concerning the age of the 



i Pacific Railroad Reports, App. to Prelim. Geol. Rept. of W. P. Blake, 

 Palaeontology, pp. 5-20, 1855. Reprinted in Pacific Railroad Reports, vol. 5, 

 part 2, pp. 317-329, 1857. 



= Gabb, Wm„ Geological Survey of California, Palaeontology, vol. 1, 1864. 



a Whitney, J. D., Geological Survey of California, Palaeontology, vol. 2, 

 p. 19 of preface, 1869. 



4 Conrad, T. A., Observations on Certain Eocene Fossils described as Cre- 

 taceous, by W. M. Gabb in his Report published in Palaeontology of Cali- 

 fornia, Am. Jour. Conchol., vol. 1, pp. 362-365, 1865; Further Observations 

 on Mr. Gabb's Palaeontology of California, Am. Jour. Conchol., vol. 2, pp. 

 97-100, 1866; Check list of Invertebrate Fossils of North America, Eocene 

 and Oligocene, p. 37, Smithsonian Misc. Coll. No. 200, 1866; Am. Jour. Sci., 

 2nd series, vol. 44, pp. 376-377, 1867. 



s Gabb, W. M., Reply to Mr. Conrad's Criticism on Mr. Gabb's Report on 

 the Palaeontology of California, Am. Jour. Conchol. vol. 2, pp. 87-92, 1866; 

 Amer. Jour. Sci., 2nd series, vol. 44, pp. 226-229, 1867; On the Subdivisions of 

 the Cretaceous Formation in California, Cal. Acad. Sci. Proa, 1st series, vol. 

 3, pp. 301-306, 1867; Geol. Surv. California, Palaeontology, vol. 2, 1869. 



