Diller — Mesozoic Sediments of Southwestern Oregon. 415 



area north of Winston and Brockway where cherts and schists 

 are shown and also made a trip into the hills across from Dil- 

 lard, but not far from the river road. I also went the full 

 length of the three disconnected areas between the Dillard and 

 the Myrtle Creek areas and believe them to be entirely Fran- 

 ciscan (Dillard).'' 



Points of agreement. — Before considering the differences of 

 opinion attention should be called to points of agreement. 

 Mr. Louderback and the writer agree in regarding the con- 

 glomerates, sandstones, shales and limestones of the Dillard 

 area as forming but one series. Along all the roads east of 

 the river and over whatever routes he traveled to examine the 

 various small areas outlined within the Myrtle area, Mr. Lou- 

 derback reports " everywhere formations characteristic of the 

 Dillard (Franciscan) series were found.'" The writer, review- 

 ing his own work in that portion of the Roseburg quadrangle 

 last September, re-examined many and perhaps most of the 

 localities studied • by Louderback and found, as did Louder- 

 back, no sufficient reason for considering the sedimentary 

 rocks in question as belonging definitely to more than one 

 series. 



The writer's views. — While surveying the Dillard area for 

 the Roseburg folio in 1895-6 Knoxville fossils were found at 

 four widely separated localities in the sandstones, and this fur- 

 nished the reason for including this area in the Myrtle forma- 

 tion. When I read Mr. Louderback's paper his confident 

 statements greatly surprised me that I should have overlooked 

 so important an unconformity or break in the series in relegat- 

 ing the whole to the Knoxville. My surprise was lessened, 

 however, when I remembered the Dothan that lies unconform- 

 ably beneath the Knoxville in the Riddles quadrangle. Upon 

 returning to the Dillard area I was expecting to find it com- 

 posed in large part of the Dothan, containing Jurassic fossils, 

 but in this I was disappointed, for all the determinable fossils 

 found at over forty localities are Knoxville. 



Knoxville fossils in the Dillard area. — The general distri- 

 bution of Knoxville fossils collected in the Dillard area is 

 shown upon the accompanying outline sketch (fig. 1), which 

 indicates their position with reference to the roads, principal 

 lines of drainage and the lentils of limestone, outlined within 

 the area. The search for fossils was made chiefly in the north- 

 east and southwest portions. In the former because it con- 

 tains all the lenses of limestone and some of other rocks exam- 

 ined most particularly by Mr. Louderback, and in the latter 

 because sedimentary rocks known to belong at the bottom of 

 the Knoxville (plant beds), and next beneath it (Dothan) lie 

 in that direction. 



