33° 



CHARLES K. SWARTZ 



The lower 500 feet of the Jennings contains only species of the 

 Naples fauna. These are especially abundant at its base where occur 



various Goniatites together with species of the genera Buchiola, Ptero- 

 chaenia, etc. A brachiopod fauna appears above this. At 520 feet 

 above the base of the Jennings Atrypa reticularis (L.) occurs, appar- 

 ently marking the advent of the new fauna. At 735 feet altitude 



