36 rROCEEDlNGS OF THE CHICAGO MEETING 



drilled in tho Ohio Kiver basin. Starting near the base of tlie Lexington 

 (Trenton) limestone, it disclosed the following stratigraphlc succession: 



Formations Thicknesses 



Feet 



Trenton limestone (Hermitage and Curdsville) 40 



Tyrone limestone 80 



Oregon and Camp Nelson limestone 430 



Knox dolomite 2,S.80 



Nolichucky shale and sandstone ; 320 



Total 3,200 



The shale brought up in the sand pump from the bottom has been identified 

 by B. O. Ulrich as Cambrian by the presence in it of fragments of certain 

 Cambrian trilobites. 



In locating this well on the top of the Jessamine Dome, below any known 

 productive oil horizon in the eastern United States, the drilling company dis- 

 regarded the advice of geologists and pinned their hopeful expectations to the 

 findings of a forked peach tree switch in the hands of one of its members. 



The paper was accompanied by an exhibit of the drill cuttings arranged in 

 order in a glass tube to the scale 1% inches equal 100 feet. 



Presented without manuscript, with sample section of well. 

 Discussed by Messrs. A. F. Foerste, M. Y. Williams, E. M. Bagg, and 

 I. C. White. 



President White withdrew, after calling Prof. A. M. Miller to the chair. 



STRATIQRAPHIC PROBLEMS IN THE COLUMBIA VALLEY BETWEEN SNAKE 

 RIVER AND WILLAMETTE RIVER 



BY J. HAKLEN BRETZ 



(Abstract) 



The dominant formation of this part of the Columbia Vallej' is a great series 

 of basalt flows, a part of the immense basalt field of eastern Washington and 

 Oregon. Direct tracing up the canyons tributary to the Columbia shows that 

 what has long been assumed is undoubtedly correct, this series of flows Is the 

 same as that named Columbia River basalt by Merriam in the upper John Day 

 Valley of north-central Oregon, and Yakima basalt by G. O. Smith in Yakima 

 "S'alley of south-central Washington. 



The Satson formation, as earlier defined, is a widespread fluviatile deposit 

 extending along the Columbia Valley from the mouth up through the Columbia 

 Gorge section of the Cascade Range and as far east as Yakima Valley. In the 

 goi'ge and eastward, the Satson formation rests unconformably on the Colum- 

 bia River basalt. Exposures of this fluviatile deposit are not continuous and 

 fossils are very rare. Correlation of separate outcrops is based on lithologic 

 characters and stratigraphlc and topographic relations. It is believed, how- 

 ever, to be the record of one epoch of stream deposition, of Pliocene or early 

 Quaternary age. 



