416 Diller — Mesozoic Sediments of Southwestern Oregon. 



Northeast portion : From the head of Roberts Creek north- 

 east along the road for over a dozen miles fossils occur at fre- 

 quent intervals. In some places the fossils are well preserved 

 but in others they are small fragments of aucellae, and it is 

 only by careful search that specimens can be found complete 

 enough to permit specific determination. Such specimens 

 have been found, however, at a number of places and Dr. 











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SOUNOA/ff OFOILLAftO AREA 



Stanton has determined without question Aucella piochii and 

 ■ Aucella crassicollis, both of which are characteristic Knox- 

 ville forms. From one locality he reports a form that "may be 

 either A. piochii or A. erringtoni" but from its field relation 

 I have no hesitation in calling it A. piochii. 



Fossils were not found at every outcrop nor could this 

 reasonably be expected, for where best exposed in California 

 the Knoxville strata are not all fossiliferous. There is no 

 doubt, however, that further search would greatly extend the 

 localities. The fossils were found most common along the 

 central and northwest side of this portion of the Dillard area 

 but some were found upon the southeast side, and lithologi- 



