378 J. S. DILIrER — THE JURASSIC FLORA OF OREGON 



named species of Hausmannia, are found in the beds of Douglas county, 

 Oregon, which have been stated by Fontaine and Ward to be of Jurassic 

 age/' 



FOSSIL SHELLS 



Throughout the plant beds numerous shells are found intermingled 

 with the plants, so that there can be no question whatever as to their 

 association and contemporaneity. The following list contains all the 

 forms identified by Doctor Stanton from this locality : 



Spondylus ? sp. 



Aucella crassicollis Keyserling. 



Inoceramus ovatus Stanton. 



TurJ)o morganensis Stanton. 



Olcosteplianus mutabilis Stanton. 



Perisphitictes ? sp. 



Hoplites Jiyatti Stanton. 



Belemnites tehamwnsis Stanton ? 



Belemnites impressus Gabb. 



Pinna ? 



Fish scales. 



Vertebra of an undetermined marine reptile. 



The fauna, as far as known, includes 10 distinct forms. Concerning 

 this fauna Doctor Stanton says : 



"The collection consists of a number of small lots containing very few spe- 

 cies, the most abundant and persistent being Aucella crassicollis Keyserling, 

 which past experience shows to be characteristic of the upper part of the 

 Knoxville formation and is believed to be confined to the Lower Cretaceous. 

 In several of the lots there are a few ammonites and other fossils that are also 

 Knoxville forms." 



The collections by Mr Storrs were so made as to preserve the associa- 

 tion of the forms, and concerning this matter Doctor Knowlton remarks ; 



"That many of the plants were found in association with Aucella and other 

 invertebrates is no longer open to question, but I am still unable to see any- 

 thing in the plants which would lead me to change my opinion as to their 

 Jurassic age, but, on the contrary, the present collection confirms it." 



RELATION TO THE "MYRTLE FORMATION" 



It is evident from what has already been stated that, at the forks of 

 Elk river, in Curry county, the plant beds clearly belong to the "Myrtle 

 formation" and lie for the most part above the basal conglomerate. At 

 any rate, no determinable plant remains were found in the basal conglom- 

 erate on the South fork of Elk river. The presence of so many specimens 



