250 



T. W. STANTON — SHASTA AND CHICO FAUNAS. 



Mr Diller plotted all the localities on the map those that were assigned 

 to different horizons were seen to be inexplicably mixed. Mr Diller at 

 that time suggested that the two faunas were more closely related than 

 had hitherto been supposed, but the evidence; did not then seem to be 

 conclusive. 



Local Lists of both Faunas from northern California. — During the past 

 held season Mr Diller had considerable collections made at Horsetown,* 

 Shasta county, California, and at Texas springs, less than two miles east 

 of Horsetown. These fossils, which have recently been studied, gave 

 unquestionable proof of the blending of the Shasta, and Chico faunas. 

 M i- 1 >iller says that the beds from which the fossils were collected at thes< i 

 two localities are of no considerable thickness. Besides the nature of 

 the matrix, the state of preservation of the fossils and the manner in 

 which the species are commingled on hand specimens, all indicate that 

 the entire collection came from the same horizon. I have therefore listed 

 the fossils from both localities together, as follows : 



u 

 u 



^Ammonites hoffmanni, Gabb. 

 * Ammonites breweri, 

 *Diptychoceras Isevis, 

 Ancyhceras (?) lineatus, " 

 *Belemnites impressus, " 

 Liocium punctatum, " 



*Lunatia avellana, 

 Gyrodes. 



Fusus aralns, Gabb. 

 *Anisomyon meekii, Gabb (?) 

 Scalaria albensis (?), D'Orb., Whit- 

 eaves. 

 Actseonina califomica, Gabb. 

 Cinulia. 



f Ringicula varia, Gabb. 



*Ringinella polita, " 



fPanopsea concentrica, " 

 \Cucullasa truncata, 

 \Nemodon Vancouver ensis, Meek. 



jTri(/onia sequicostata, Gabb. 



'I'Trii/oiiia leana, 



Trigonia. 



fPecten operculiformis, Gabb. 



f Thetis annulata (Gabb) = Cardium 



(Lsevicardium) annulatum. 

 'I'Corbula traskii, Gabb. 

 fMytilti* tjioidraius, Gabb (?) 

 Mytilus lanceolatus, Sowerby. 

 \Leda translucida, Gabb. 

 *Pleuromya laevigata, Whiteaves. 

 ~\Tellina hoffmanniana, Gabb. 

 fTellina mathewsonii, " 

 \Maetra ashbtirneri, " 



fChione varians, " 



fMeekia radiata, " 



fMeekia navis, " 



fMeekia sella, " 



Rhynchonella. 



*Mostofthe localities mentioned are shown on the sketch map prepared by Mr J. S. Diller, 

 forming plate 1, page 205, of this volume. 



*fThe species belonging to Mr Gabb's Shasta fauna arc marked with an asterisk (*), those 

 belonging t<> t h> ■ < h ieu u i 1 1 » an obelisk (t). The others have not been positively assigned to either 

 horizon. 



Mr Gabb's nomenclature is used, in most- cases without revision, throughout this paper. 



