GEOLOGICAL SOCIETY OB' PENNSYLVANIA. 



247 



fossil. They are not unfrequently found in the limestone 

 of Davidson county, but still more frequently in the 

 glades near Tennessee river, in Perry county. They 

 are of the size of one half to four inches in length, and 

 are converted into quartz. 



The geological position mentioned by Goldfuss ^"^in 

 soil on transition limestone near Bensberg,'^ corresponds 

 thus with that of ours. 



