394 



J. S. DILLEE THE JURASSIC FLORA OF OREGOK 



(1907) in the quartz-veined rocks occur near the southwest corner of the 

 area adjoining the igneous rocks one-third of a mile north of Josten's 

 house, in section 14, township 29 south, range 7 west, of the Willamette 

 meridian, and also in section 29, township 29 south, range 6 west, Willa- 

 mette meridian, on the trail from the upper part of Eice creek over to 

 Willis creek. At both localities imdoubted examples of A. crassicoUis 

 were obtained in fine conglomerates cut by quartz veinlets and interbedded 

 with crushed sandstones that are occasionally full of such veinlets." 



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Figure 4. — DiUard Area of Knoxville Formation 



LOCAL SILICIFICATION AT THE CLOSE OF THE KSOXVILLE 



It is not claimed that the more general silicification of the Dothan took 

 place at the same time as that of the Knoxville in the DiUard area, for 



1" It should be mentioned that there is some evidence recently observed concerning the 

 relation of the glaucophane schists to the sedimentary rocks of the Dillard area. A con- 

 glomerate upon the right bank of the Umpqua river, a short distance below Winstons 

 bridge, contains distinct pebbles of glaucophane schist and clearly indicates that the 

 conglomerate is younger and lies uncomfortably on the schist. The conglomerate has 

 been regarded as Knoxville, but no fossils could be found in it to prove its age. On the 

 other hand, it lies on the side of the Dillard area adjoining the Eocene, and several areas 

 of Eocene are now known to be included in the Dillard area as originally mapped. 



