2 



Marine Sedimentary Formations op Panama 



MEXICO AND CENTRAX. AMERICA 



Pliocene of Yucatan and Limon, 

 Costa Rica 



St. Marys formation 

 Choptank formation 



Gatun for- 

 mation 

 (Costa 

 Rica) 



Pacific 

 Coast of 

 Nicaragua 



Exposures 

 on Isthmus 

 of Tehuan- 

 tapec 



San Rafael formation 



Manzanilla*, Costa Rica, and deposits 

 with Pecten aff: P. poulsoni and 

 large discoid orbitoids, Mexico 



SOXTTHEASTERN UNITED STATES 



Waccamaw marl, Nashua marl, and Caloosahatchee marl 

 (nearly contemporaneous) 



Sicilian 



Astian 



Plaisancian 



Yorktown formation, Duplin marl, and Choctawhatchee marl 

 (nearly contemporaneous) 



Pontian 

 Sarmatian 



Calvert formation 



Marks Head marl 



Shoal River marl member 

 Alum Bluff formation ■{ Oak Grove Band member 

 Chipola marl member 



Chattahoochee formation 



Tampa formation 



I Byram calcareous marl 

 Vicksburg group •] Marianna limestone 

 [Red Bluff clay 



Brito formation of Ni- 

 caragua (typical Brito) 



Frio clay 

 Fayette ss. 



Claiborne group 



Wilcox formation 



Midway formation 



-3 



O 



J3 



Jackson formation 



Ocala limestone 



I Gosport sand 

 Claiborne group -j Lisbon formation 



[Xallahatta buhrstone 



Wilcox group 



Hatchetigbee formation 

 Bashi formation. 

 Tuscahoma formation 

 Nanafalia formation 



Midway gioup 



fNaheola formation 

 ■{ Sucarnochee clay 

 [Clayton limestone 



EUROPEAN 



TIME 



SUBDIVISIONS 



Tortonian 



Helvetian 



Burdigalian 



Aquitanian 

 Chattian 



Rupelian 



Lattorfian 

 (Sannoisian) 



Ludian (Pria- 



bonian) 

 Bartonian 



Auversian 

 Lutetian 



Ypresian** 



Sparnacian'' 



Thanetian'' 

 Montian'* 



" May belong stratigraphically somewhat higher. 

 "* Correlation proposed by E. W. Berry. 



275 



