[Annals N. Y. Acad. Sci., Vol. XVII, Part i, pp. 1-415. 

 September, 1906.] 



A PHYTOGEOGRAPHICAL SKETCH OF THE ALTAMAHA 



GRIT REGION OF THE COASTAL PLAIN OF 



GEORGIA. 



Roland M. Harper. 



CONTENTS. 



PAGE 



Introduction 5 



Part i. 



Temperate Eastern North America and some of the systems which 



have been used in subdividing it 7 



Geological divisions 



1 . Metamorphic (Piedmont region and Blue Ridge) 9 



2. Palaeozoic (Appalachian Valley, Cumberland Plateau, etc .)•• - 10 



3. Coastal Plain (Cretaceous and Tertiary) 10 



4. Subtropical Florida (Quaternary) n 



5. Glaciated region 12 



The coastal plain of Georgia and its subdivisions 13 



1 . Fall-line sand-hills 14 



2. Cretaceous 14 



3 . Eocene 15 



4. Lower Oligocene 16 



5. Chattahoochee 17 



6. Altamaha Grit 1 b 



7. Uppermost Oligocene 19 



8. Southern Lime-Sink region 19 



9 . Flat pine-barrens 19 



10. Littoral region 20 



The Altamaha Grit region in detail 



Location and boundaries 20 



History of geological exploration 21 



Latitude and longitude 22 



Range of altitude 22 



Geology and soils 22 



Tertiary, Lafayette, Columbia 



1 



