ENCJimiTES, 



121 



surface where the limestone rocks have been most 

 weathered. And, as the structure of most fossils 

 imbedded in limestones is such that they are harder 



Fig, lo^.—lFoodocr/nus itmc7-ociactyius. 



than the limestone itself, it follows that when surface 

 weathering has gone on for some time, the fossils 

 stand out in relief. Millions of Encrinitc stems 



