

Figure I. A small anticline in a post-glacial valley. Huidekoper's 

 Ravine, Meadville, Pennsylvania. 



. <- if- -r ■ -' 



42*>^s 



s- 



■ 



- i v 



v 



5« 



Figure •-'. \ fold in Portage Flaggs in lake cliff. Three miles ... 

 Krie. Pennsylvania. 



