THE 



AMERICAN JOURNAL OF SCIENCE 



[FOURTH SERIES.] 



Art. XXXIX. — The Mesozoic Sediments of Southwestern 

 Oregon j by J. S. Dillbr. 



Introduction. 



Subdivisions discriminated. 

 Galice Formation (Jurassic). 

 Definition. 

 Lithology. 



Distribution and thickness. 

 Fossils and age. 

 Structure of Galice area. 

 Limits of Galice formation. 



Relation to the igneous rocks bordering the Galice area. 

 Dothan Formation (Jurassic). 

 Definition. 



Lithological features. 

 Distribution and thickness. 

 Fossils and age. 

 Structure of Dothan. 

 Relation to adjacent volcanic rocks. 

 Relation to adjacent Galice formation. 

 Myrtle Formation (Cretaceous). 

 Characteri z ation . 

 Lithification. 

 Distribution. 



Relation of the Myrtle formation to the Dothan. 

 Plant beds. 



The Dillard series of Louderback. 

 Introduction. 



Louderback's general results — Lower series — Upper group — 

 Comparison. 

 Dillard area of Dillard series. 



Defined — Rocks considered — Different views — Locality of 

 Louderback's observations — Points of agreement — The 

 writer's views — Knoxville fossils in Dillard area : north- 

 east portion ; do, southwest portion — Conclusions from 

 fossils, Stanton's report — Quartz veining — Limestone — 

 Chert — Nomenclature. 

 Resume. 



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

 28 



