Abstracts of Papers. 69 



The Breaking of tKe KJasnville Reservoir, 

 ISIovember 5, 191a 



(Illustrated.) 



By Wilbur A. Nelson, State Geological Survey. 



(Abstract.) 



On November 5, 1912, at 12:25 a. m., the east basin of the 

 Nashville reservoir broke. 



The cause of the break was the character of the rock forma- 

 tion upon which the walls were built. The limestone contained 

 thin bands of shale, which the action of water had turned to clay. 

 It was upon one of these clay seams where the rocks dipped locally 

 about eight degrees from the reservoir that the slip occurred. 

 The entire wall with about four feet of the limestone upon which 

 it was built swung outward. On either side of the main break 

 several smaller breaks occurred. 



Slides were used showing diagrams of the reservoir, the breaks 

 in the wall, the mashed rocks and the damage to the surrounding 

 property. 



TjJpes of Iron Ore Deposits in East Tennessee 



By C. H. Gordon, University of Tennessee. 



(Abstract.) 



The deposits of iron ores in East Tennessee are of three types. 

 Along the eastern side and elsewhere in the Great Valley are de- 

 posits of brown ores (Limonite). In these deposits the ore oc- 

 curs in residual clays resulting from the disintegration of the un- 

 derlying rocks through agencies of weathering, the concentration 

 of the ores being due to the operation of these agencies through- 

 out the long period of time. The ores occur in masses or pockets 

 in the superficial clays, a fact that has to be taken into account in 

 their commercial exploitation. 



