124 IOWA ACADEMY OF SCIENCE 



SUMMARY. 



The marked similarity in lithologic character and stratigraphic 

 position of the "Neda Iron Ore" and the oolitic material at Lore 

 Hill seem to be sufficient ground for considering them parts of 

 the same formation. It must not be assumed, however, that the 

 sea in which they were deposited was continuous over the entire 

 area between these widely separated outcrops. It is more prob- 

 able, as suggested by Savage and Ross, that the deposition of the 

 oolite took place in shallow, local basins which were at least in- 

 termittently connected. 



It is not likely that the "Clinton" or "Neda" formation in 

 Iowa will ever become of economic importance, for it appears to 

 have a very limited areal distribution and but slight thickness. 

 Further search along the Ordovician-Silurian boundary in north- 

 eastern Iowa may, however, reveal larger patches than the one 

 described. 



Geology Laboratory, 



State University of Iowa. 



