Vol. XI] D1CKERS0\'-PT. REYES AND SANTA ROSA Q UADRANGLES 545 



Thais papillus (Linnaeus) 



Trophon (?), sp. 



Area trilineata Conrad 



Cardium, sp. 



Glycimeris cf. gabbi Dall 



Cryptomya californica Conrad 



Macoma cf. edentula Broderip & Sowerby 



Paphia staleyi Gabb 



Schizothaerus pajaroensis Conrad 



Solen sicarius Gould 



Spisula albaria (Conrad) 



Spisula cf. falcata (Gould) 



Spisula voyi (Gabb) 



Spisula cf. voyi (Gabb) 



Spisula (?) sp. 



The same general characters mark this group in the region 

 to the west around Freestone. At a locality in the bed of 

 Salmon Creek, one-eighth of a mile from the railroad sta- 

 tion at Freestone, in blue gray argillaceous sandstone asso- 

 ciated with a yellow tuffaceous sandstone, a Merced fauna 

 was obtained, at a stratigraphic horizon which cannot be 

 over 50 feet above the base of this group, as Franciscan 

 cherts occur only a half mile further up stream and three- 

 quarters of a mile down stream. The Merced beds at this 

 point have an east-west strike and dip of 5° S. 



A prominent 4-foot bed of tuff containing casts of marine 

 shells is found 150 feet stratigraphically above this last lo- 

 cality on the road between Freestone and Sebastopol and 

 about one-quarter of a mile east of Freestone. The bed, 

 which is nearly horizontal, is underlain and overlain by yel- 

 low tuffaceous sandstone. The material on the crest of the 

 plateau is a light gray sand which is probably of Pleisto- 

 cene age, though no sharp division line was found which 

 separates' these sands from the underlying Merced. The 

 even sky-line as seen here can scarcely be interpreted any 

 other way except that it represents a marine plain of Pleisto- 

 cene age. (See plates XX and XXVI.) 



On Bodega-Vallev Ford Road, one-eighth of a mile south 

 of Bodega Postoffice and church, Crepidula grandis and Sax%- 

 domus nuttalli were collected from hard, coarse, gray sand- 



