230 PROCEEDINGS OF THE PALEONTOLOGICAL SOCIETY 



10. The Lower Etchegoin is most closely related to the Lower Fernando 

 Pliocene near Newhall, while the Upper Ktchegoin is most closely related to 

 the Lower I'liocene beds at Sargent. 



FAUNA. OF THE PINOLE TUFF 

 IJY JOHN C. MERKIAM AND CHESTER STOCK 



(Adstract) 



The fauna of the Pinole tuff has been known by a small number of inverte- 

 brate forms from the type locality near Rodeo Station, on San Pablo Bay, in 

 middle California. Vertebrate remains discovered in a section of loose gravels 

 and tuffs near the town of Pinole, on San Pablo Bay, have recently been shown 

 to represent the Pinole Tuff stage. Recent collections from the Pinole locality 

 have added to the vertebrate fauna several genera not previously known at 

 this horizon and much better material of several forms represented at the 

 type locality, The collections now^ available make possible a much more satis- 

 factory correlation than that heretofore proposed. 



LOWER AND MIDDLE CAMBRIAN FAUNAS OF THE MOHAVE DESERT 

 BY C. W. CLARK 



(Adstract) 



Lower and Middle Cambrian sedimentary rocks occur on the Mohave desert 

 near Cadiz, California. The Lower Cambrian rests here on the Precambrian 

 granites and schists. Late Paleozoic, niarbleized limestone, probably Carbon- 

 iferous in age, rests conformably on the Middle Cambrian. The general dis- 

 tribution of these formations is shown in the Guide Book to Geology, etcetera, 

 Santa Fe Railroad. All the localities of sedimentary rocks noted in the Guide 

 Book as occurring near Cadiz were visited, excepting those in the Providence 

 Range, but fossils were obtained only from the Bristol Mountains (Iron Moun- 

 tains). 



The Lower Cambrian is represented by the Olenellus fauna, to which one 

 new genus and three new species of trilobites have been added. Several speci- 

 mens of Bathyuriscus mark the Middle Cambrian. A few species of Carbon- 

 iferous fossils were found near the top of the marbleized limestone, which is 

 the uppermost formation of the sedimentary series in this region. 



ANCIENT PANAMA STRAITS 

 BY ROY E. DICKERSON 



(Abstract) 



According to Stanton, the Pacific and Texas Cretaceous have no species in 

 common, and although he recognizes the presence of an Upper Cretaceous 

 series containing a Pacific fauna resting on a Lower Cretaceous, Comanchian 

 stage at Catorce, he states that in no place in the entire region has a com- 

 mingling of Upper Cretaceous faunas of these two provinces been found. 



Beds of Eocene age containing several species common to the Tejon of Cali- 

 fornia occur along the Mexican Gulf border. White limestones in the Isthmus 



