1 H Ziegler— Siliceous Oolites of Central Pennsylvania. 



siliceous oolite as being a replacement of the oolitic limestones 

 occurring within this area.* 



All of the above papers, with the exception of the last, were 

 based on loose material occurring within a very limited area 

 north of State College (see fig. 1). In fact, it was long sup- 



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posed that no exposure of the oolite existed, but that the loose 

 pieces were the result of the erosion of the overlying strata. 

 In the fall of 1910, G. E. Anderson located the first exposure 

 in a railroad cut north of State College. Subsequently, while 

 * Journal of Geology, vol. xx, p. 259, 1912. 



