Diller — Mesozoic Sediments of Southwestern Oregon. 417 



call} 7 the strata upon that side are the same as those containing 

 fossils. 



In the sandstone within 300 feet of the type area of Whit- 

 sett limestone, 14; miles northwest of Dodson Mountain, well 

 preserved specimens of Aucella crassicollis were found. The 

 sandstone very near or in contact with the limestone upon both 

 sides appears to be identical with that which is fossiliferous. 



Aucella occurs in the sandstone adjoining the northeastern 

 lentil of limestone in Section 14, as well as near the mass of 

 basic eruptive in Section 21 as shown in the Redding folio and 

 near both of the border areas of amphibole schists a few miles 

 farther southwest. 



Southwest portion : — Some years ago Aucella was found in 

 a conglomerate several miles north of Brockway in the immedi- 

 ate vicinity of the outcrops of chert and amphibole schist of 

 that region, but the greater number of observed localities are 

 about Kent, Rice, and Willis creeks. 



On Kent Creek, fragments of shale, sandstone and conglom- 

 erate containing Aucella crassicollis occur throughout its 

 course. Those in calcareous shale are in place within two 

 miles of its mouth ; the others come from higher up, where 

 they occur more frequently in rocks that are locally well-veined 

 with quartz. 



Rice Creek has a gentle grade and a few rock outcrops in 

 its bed as compared with Kent Creek. Aucella crassicollis 

 was sought for at only two points and found at both. At Rice's 

 Ranch, nearly 2 miles above the mouth of the creek, Aucella 

 was found in fragments like those of Kent Creek. JSTear the 

 head of the creek in Sec. 25, T. 29, R. 7, Mr. Storrs, to whose 

 skill as a collector I have so often testified, recently found 

 Aucella crassicollis in conglomerate shale and sandstone that 

 is in part traversed by distinct veins of quartz. This locality 

 is within a short distance of the intrusive which forms Big 

 Baldy and occupies so large an area on the southern border of 

 the Roseburg quadrangle. 



On Willis Creek fossiliferous fragments of sandstone and 

 conglomerate are common, especially above the forks in the 

 neighborhood of a mass of red chert. Sufficient time was not 

 devoted to this locality to find them in place, but the rocks are 

 of the same character as those on Kent and Rice creeks. They 

 must occur in place before reaching the limit of the area 

 within a mile south of the mass of red chert. 



Dr. Stanton 's report on the fossils. — The fossils collected 

 in the Dillard area were not made the subject of a special report 

 by Dr. Stanton but included in his general report upon all the 



Am. Jour. Sci. — Fourth Series, Vol. XXIII, No. 138. — June, 1907. 

 29 



