lymn/Eim: of north America. 



83 



Geological Distribution 

 AMERICAN FOSSIL LYMN^EAS 

 )p3omanchean ©Oligocene 

 ACretaceous Twiddle Miocene 



■Lower Eocene "#tower Pliocene 

 JBMiddle Eocene .^Upper Eocene XPleist 



Fig. 8. 



Map showing distribution of American Fossil Lymnoeas. 



