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A CONTRIBUTION TO THE_^EOLOGIC HISTORY/ 

 OF THE/PLORIDIANy PLATEAU. 



By THOMAS WAYLAND YAUGHAn/ 

 Geologist in Charge of Coastal Plain Investigation, U. S. Ge6logical Survey, 

 Custodian of Madreporaria, U. S. National Museum. 



15 plates, 6 text figures. 



99 



