Diller — Klamath Mountain Section, California. 357 



In the Hay Fork region observations were extended last 

 summer and a number of fossils collected which throw a 

 stronger light upon the age of the deposits, and will help ulti- 

 mately, when all the evidence is disclosed, to form a more com- 

 plete picture of the conditions of deposition. 



Hay Fork Yalley has a length east and -west of about 11 

 miles and a width of less than two miles. Looked at from the 

 west, one is impressed with the contrasting slopes bounding the 

 valley. The long gentle slope on the north side and the steep 

 abrupt one on the south side suggest that the valley is largely 

 the result of displacement. The fine shales and sandstones 

 which till the valley are well exposed on Hay Fork Creek 

 below the mouth of Salt Creek, where they contain impure 

 coaly layers and are locally full of shells of a fresh water 

 gasteropocl, and also of fruit and leaves. The light-colored 

 beds have a thickness of several hundred feet and dip in vari- 

 ous directions from 30 to 50 degrees, with strike in some places 

 northeast and in others northwest. 



The shells are very abundant throughout a thickness of 

 nearly 100 feet and although not found with leaves in the same 

 stratum were found within a few feet of leaves numbered 

 6170. The shells were referred to Dr. Dall, who reports as 

 follows : 



"The fossils consist of a single species of Vivipara very much 

 crushed, and therefore hardly identifiable specifically. In a gen- 

 eral way it is not unlike an undetermined species of ' Campelonia* 

 described and figured by Meek in the 40th Parallel Survey from 

 Bear River, Utah, and referred with the other species from that 

 horizon to the Cretaceous. There is no Vtvipara known at 

 present from California, either recent or fossil. I should say the 

 species cannot be newer than the Pliocene and may be as old as 

 the Cretaceous." 



The fossil leaves collected from the Hay Fork beds were 

 referred to Professor F. H. Knowlton, who reports as follows: 



"No. 6164. Hay Fork Creek, 100 yards below the mouth of 

 Salt Creek, three-quarters of a mile west of the town of Hay 

 Fork. 



"No. 6169. Tule Creek near its mouth into Hay Fork Creek, 

 one and one-half mile west of town of Hay Fork. 



This material is similar, being a fine-grained, soft and highly 

 carbonaceous clay. It is filled with fruits of Trapa, of the type 

 of the living Trapa natans, nothing else being present. The 

 fruits are mostly broken, but a sufficient number are so preserved 

 as to leave no doubt as to their nature. When the 'horns' are 

 broken away from the body of the fruit they very much resem- 

 ble small shark's teeth, and were so identified last year.* Trapa 

 * U. S. Geol. Survey, Bull. 196, p. 43. Report by Mr. F. A. Lucas. 



