1>LANT beds of OROVILLE, CALIFORNIA 387 



In the above report it is evident that Doctor Knowlton, following Pro- 

 fessors Ward and Fontaine, regards the "flora of the Shasta series" not 

 only as distinct from the Jurassic flora of Oregon, but also as younger. 

 The former is considered as Cretaceous and the latter Jurassic. 



Of the 23 species determined by Doctor Knowlton in the collections 

 from the west side of the Sacramento valley, 5 had been previously re- 

 ported by Ward and Fontaine from the Knoxville only, 5 from the Horse- 

 town only, 7 from both Knoxville and Horsetown, 2 from the Knoxville, 

 Horsetown and Chico, and 3 from the Kootenai. 



FAUNA 



In the same strata, more or less closely associated with the fossil plants, 

 a few fossil shells were found by Storrs. No attempt was made to get 

 shells not found closely related to the fossil plants. Large and complete 

 faunal collections were made in the same region and described by T. W. 

 Stanton" years ago. In Storrs' collection Doctor Stanton reports the fol- 

 lowing forms from the plant beds, and states that the horizon to which 

 they belong is the upper Knoxville, within the zone of Aiicella crass ic oUis : 



Aucella crassicollis Keyserling. 

 Lytoceras hatesi Trask. 

 Hoplites crass iplicat us Stanton. 



Pinna sp. Similar species of Pinna are known in both earlier uud 

 later formations. 



Plant Beds of Oroville, California 

 historical 



A little more than 3 miles in a direct line north 30 degrees east of Oro- 

 ville, on the southern slope of Monte de Oro, at 8, figure 1, Mr H. W. 

 Turner in 1886 observed some clay slate containing traces of fossil leaves. 

 Beds of conglomerate were noted with the slates and reported to be made 

 up in part of pebbles of (porphyrites) altered andesites. The strata were 

 designated the Monte de Oro formation and briefly described in the Sev- 

 enteenth Annual Eeport of the IT. S. Geological Survey, part i, page 548.'' 



Dr T. W. Stanton visited the locality in 1894 and collected some good 

 plants of great interest. The following year Professor Ward and James 

 Storrs made large collections which have since been studied and described 



• Contributions to the Cretaceous paleontology of tlie Pacific coast : The fauna of the 

 Knoxville beds. U. S. Geological Survey Bulletin no. 133, 1895. 



'The Monte de Oro formation is briefly described in some of the Gold Belt folios, be- 

 ginning with no. 31, Pyramid peak, p. 1. 



