30 EOCENE AXD LOWER OLIGOCENE CORAL FAUNAS. 



or strictly shallow-water genera occur in the assemblage, we conclude that 

 the water in which the corals lived was beyond the depth of reefs, probably 

 about 100 fathoms deep. 



JACKSONIAN STAGE. 



Good collections of corals from the Jaclvsonian stage have been made 

 in Mississippi and Louisiana. The species from the two States are almost 

 identical. They fu'e: 



Flabellum cuueiforme var. wailesi Courad. Astrangia expansa Vaughau. 



Aklricliia elegaiis Yaugbau. Astrangia ludoviciaiia Vaugban. 



Turbinolia pbaretra Lea. Platycd-uia jacksoueusis Vaugban. 



Trocbocyatbus luuiilitiformis (Courad). Balauoi)byllia irrorata (Conrad). 



Trocbocyathus lunulitiformis var. uiont- Eudopacbys maclurii (Lea). 



gomei'ieusis Vaughau. Eudopacbys maclurii var. triaugulare 

 Caryopbyllia dalli Vaughau. Courad. 



Parasinilia ludoviciana Vaughau. Eudoi)achys uiiuutuin Vaugban. 

 Astrohelia burusi Vaughau. 



The depth in which the species lived probably did nut exceed 50 

 fathoms. Astrangia ranges in depth from shallow water to 315 fathoms, 

 but is usually in shallow water. Parasmilia occurs iixnn 50 to 300 fathoms. 



LOWER OLIGOCENE. 

 VIGKSI3URGIAN STAGE. 



Red Bluff beds. — Tlic spcclcs fouud in tliesc beds are: 



FlabeUum rhomboideuui Vaughau. Oculiua harrisi Vaughau. 



Turbinolia insiguitica Vaughau. Balauopbyllia caulifera var. nuiltigrauosa 



Steriphonotrochus pulcher Vaughau. Vaughau. 



Oculiua aldricbi Vaughau. ISalauophyllia elongata Vaughau. 



The Oculinai would suggest a depth of 50 fathoms or less. 



vicksburg beds. — The great abundance of Oculinae in these beds indicate 

 conditions approaching those favorable to the growth of coral reefs — i. e., 

 shallow-water conditions, or less than 50 fathoms. 



Coral limestone at Salt Mountain, near Jackson, Alabama. Here COuditlonS faVOrablc for 



reef-making corals obtained. (_)nly two species could be described, because 

 of the poor state of preservation of the material. They are Stylophora i^on- 

 clerosa Vaughau and Turbinaria (!) aJahamensis Vaugban. There are man}' 

 other species in the limestone. 



The following is a general section at Salt Mountain: 



