404: Diller — Mesozoic Sediments of Southwestern Oregon. 



30 feet. Conglomerate locally overlain by a few feet of 



black slates greatly sheared. 

 300 " Dark sandstones with some heavy layers and a 



small proportion of interbedded slates. 

 1000 " Black slates. 

 500 " Sandstones and conglomerates with a smaller 



proportion of slates. 

 200 " Slates, black and gray. 



Within the Galice area to the northeast of Grave Creek the 

 proportion of dark sandy slates increases and to the southwest 

 along Galice Creek and Rogue River it is slightly diminished. 

 Along the eastern border tufaceous rocks play a considerable 

 part. 



Sixteen miles northeast of Glendale the Galice slates re- 

 appear on the slope of Canyon Creek and form a narrow belt 

 extending northeast between volcanic rocks to the forks of 

 Beal Creek and beyond, where it merges into a great thickness 

 of black slates exposed along the South Fork of the Umpqua. 



To the southwest of Galice the slates are interrupted by 

 igneous rocks but reappear 35 miles beyond in California, 

 where the conglomerates and slates cover a large area. They 

 are well exposed near the Oregon line about the head of Shelly 

 and Monkey creeks, which are tributaries of Smith River. 



Fossils and age. — The first fossils discovered in this forma- 

 tion were obtained on Galice Creek by Prof. J. N. Hyde, of 

 the State University of Oregon, who through Chester W. 

 Washburn e kindly loaned his collection for determination. 

 Dr. T. "W. Stanton, who has examined all the fossils, reports 

 the following forms : 



Along Galice Creek and Rogue River, Aucella erringtoni 

 occurs at many points. Is well preserved at Almeda mine, 

 where Perisphinctes was obtained through the superintendent, 

 H. B. Perks. In a conglomerate at the mouth of Anderson 

 Gulch, Trigonia, Amberleya, and Belemnites were found with 

 Aucella, and Dr. Stanton remarks that " the state of preser- 

 vation of this lot is too poor for specific determination. Many 

 of the Aucellae cannot be distinguished in form from A. piochi, 

 but a few fragmentary imprints of the surface indicate that 

 they were striated like A. erringtoni." 



Along Grave Creek, Aucella erringtoni was found at numer- 

 ous horizons throughout the section. Belemnites is common, 

 and at one point Pecten ? was found. 



On Cow Creek, near the mouth of Rattlesnake, one-fourth 

 mile below Reuben Spur, the largest collection was obtained, 

 and Dr. Stanton recognizes "Aucella erringtoni, Ctenostreon t 

 sp., Pecten? sp. — may be a Lima, Turbo? sp., Perisphinctes ? 

 sp. — same as that from Anderson's ditch on Galice Creek." 



