GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 205 



vertebrate collections. Specimens of Orthophragmina were obtained 

 at the same station and indicate upper Eocene or lower Oligocene as 

 the age of the rock. This matter will be further discussed in the 

 forthcoming report on West Indian paleontology. 



BASAL PART OF CHATTAHOOCHEE FORMATION IN GEORGIA. 1 



The localities at which the specimens of fossil corals were obtained 

 are at Blue or Russell Springs on Flint River about 4 miles below 

 Bainbridge, and at other localities along Flint River to Hale's Land- 

 ing, about 7 miles below Bainbridge. The corals are most embedded 

 in or weathered out of chert which was once a coral-reef limestone 

 that was formed on the subaerially eroded surface of the Eocene 

 Ocala limestone after submergence. Dr. W. H. Dall in a recently 

 published paper 2 appears to correlate this bed with the Orthaulax 

 pugnax zone of Tampa, Florida, and states that I concur in that 

 opinion. Although the chert forming the base of the Chattahoochee 

 formation in the vicinity of Bainbridge is faun ally nearly related to 

 the "silex" bed of the Tampa formation, in my opinion they are not 

 of the same age, the "silex" bed being geologically younger. The 

 coral faunas are not the same, and there is at least a species of one 

 genus at Tampa of stratigraphically later affinities than any species 

 in the vicinity of Bainbridge. 



The following are the species from near Bainbridge mentioned in 

 this paper: 



Fossil corals from basal part of Chattahoochee formation near Bainbridge, Georgia. 



Stylophora minutissima Vaughan. 



Stylocoenia pumpeUyi (Vaughan) Vaughan, Antigua. 



Astrocoenia decaturensis Vaughan, Antigua, Cuba. 



Orbicella bainbridgensis Vaughan, Santo Domingo ?, Porto Rico. 



Antiguastrea cellulosa (Duncan), Antigua, etc., Tampa. 



var. silecensis Vaughan, Antigua, etc. 

 Favites polygonalis (Duncan) var., Antigua. 

 Siderastrea silecensis Vaughan, Tampa; Alum Bluff formation. 

 Diploastrea crassolamellata (Duncan), Antigua, etc. 



var. magnified (Duncan), iYntigua, etc. 

 Astreopora anliguensis Vaughan, Antigua. 



Actinacis alabamiensis (Vaughan), Antigua; Salt Mountain, Ala. 

 Goniopora decaturensis Vaughan, Cuba. 



1 The more important references to the literature are as follows: 



Vaughan, T. W., A Tertiary coral reef near Bainbridge, Georgia, Science, n. s., vol. 12, pp. 873-875, 1900; 

 Bainbridge and vicinity in Preliminary report on the Coastal Plain of Georgia by O. Veateh and L. W. 

 Stephenson, prepared under the direction of T. W. Vaughan, Geol. Survey of Ga. Bull. 26, pp. 328-333, 

 1911; The reef coral fauna of Carrizo Creek, Imperial County, California, and its significance, U. S. Geol. 

 Survey Prof. Pap. 98-T, pp. 363-364, 1917. 



Cooke, C W., Age of the Ocala limestone, TJ. S. Geol. Survey Prof. Pap. 95-1, pp. 107-117, 1915. 



2 A contribution to the invertebrate fauna of the Oligocene beds of Flint River, Georgia, Proc. U. S. Nat- 

 Ms., vol. 51, pp. 487-524, plates 83-88, 1910. 



