890 IV. LINDGREN—F. H. KNOWLTON 



Quercus distincta Lx. ^scuhis n. sp. 



Quercus elanoides Lx. ^sculus fruit. 



Quemis castanopsis f Lx. Aralia Whitneyi Lx. 



Quercus Boweniana Lx. Aralia angustiloba Lx. 



Castanea Ungerz. Heer. Laurtis Californica Lx. 



Castanea n. sp.? Persea pseudo-Carolinensisl^x. 



Castanopsis chrysophylloides Lx. Zizyphus piperoidasl^y.. 



Corylus sp. Zizyphus n. sp. 



Magnolia lanceolata Lx. Vibitrmim tilioides Ward. 



Magnolia Californica Lx. Viburnum. Whymperi 'Wdird. 



Liquidambar, fruit. Viburnum elongatum ? Ward 



Acer cequidefttatimi Lx. Viburnum n. sp. 



y4^^r fruit. Viburnum fruit. 



Rhus myriccefolia Lx. Cornus ovalis Lx. 



Rhus dispersa Lx. ^ Cornus hyperborea Heer. 



Rhus Boweniana Lx. Cornus n. sp. 



/?/22« n. sp. Cercocarpus aniiquus Lx. 



This list, it should be remembered, is tentative and is likely 

 to be modified by further collections or possibly to some extent 

 bv additional study. 



Tlie age of the lone formation. — The flora found in the lone for- 

 mation is rather meager. North of 39° 30' Messrs. Diller and 

 Turner^ have at several places found a scant flora considered by 

 Professors Lesquereux, Ward and Knowlton to be of Miocene 

 age and contemporaneous with the auriferous gravels. At Vol- 

 cano hill. Placer county, H. W. Turner found fragments of leaves 

 partly identical with those from Chalk Bluffs and Professor 

 Knowlton considers them as probably Miocene. 



In the Marysville Buttes, in the center of the Sacramento 

 Valley I found a series of beds resting on the Tejon which I 

 correlated with the lone formation. In these a number of shells 

 were found which Messrs. Stearns and Dall regarded as Miocene. 

 The following forms were identified : 

 Crassatella Collina Conr. Macoma sp. 



Venericardia borealis Conr. Tapes (Cuneus) sp. 



Verticardia ? sp. Saxidomus sp. 



Acila castrensis Hinds. Cardium modestum. 



^J. S. Diller, Lassen Peak District, 8th Ann. Rep., U. S. G. S., p. 419. H. W. 

 Turner, Rocks of the Sierra Nevada, 14th Ann. Rep., U. S. G. S., p. 462. 



