

Applin and Jordan, and Lepidocyclina mantelli (Morton). The Foraminifera contained in the Oligocene 

 Series in Georgia include those species that are indigenous to this unit as well as several species that 

 represent reworked specimens from the middle Eocene, a phenomenon that has been adequately discussed 

 by several investigators as for example Cole (1941, p. 15, 16) and the Applins (1944, p. 1682-1683). Be- 

 cause these reworked fossils in the Oligocene represent forms that were originally described from and are 

 characteristic of the middle Eocene limestones of peninsular Florida, they have never been found in the 

 middle Eocene elastics of Georgia. Thus, in attempting to find the source beds from which they were re- 

 moved, they could not have come from erosion of middle Eocene elastics. Rather, they must have been 

 weathered out of and transported away from the limestone facies. By this method of reasoning, the rework- 

 ed forms so widespread in the lower Oligocene sediments of Georgia must have been transported north- 

 ward and derived from middle Eocene limestone in the Gulf of Mexico, southwestern Georgia, or penin- 

 sular Florida. The following faunal list summarizes the more important foraminiferal species observed 

 in wells penetrating the subsurface and are regarded as diagnostic of the Oligocene in Georgia. 



Table 4. — Oligocene Foraminifera of Georgia 



Textulariidae: 



Spiroplectammina mississippiensis (Cushman) 



Textularia adalta Cushman 

 conica D'Orbigny 

 tumidula Cushman 



Miliolidae: 



Quinqueloculina leonensis Applin and Jordan 



Several species of Pyrgo 



Lagenidae: 



Robulus arcuato - striatus (Hantken) 

 articulatus (Reuss) 

 cultratus Montfort 



Polymorphinidae: 

 Globulina sp. 



Nonionidae: 



Nonion advena (Cushman) 



alabamense Cushman and Todd 

 inexcavatus (Cushman and Applin) 



Nonionella hantkeni (Cushman and Applin ) var. byramensis Cushman and Todd 

 oligocenica Cushman and McGlamery 



Elphldium leonensis Applin and Jordan 

 texanum (Cushman and Applin) 



Camerinidae: 



Camerina dia (Cole and Ponton) 



Operculinoides sp. 



16 



