FOSSILS OF THE CHATTAHOOCHEE LIMESTONE. 153 



Scala, Plicatula, Divaricella, Pyrazisinus, Phorus, all as poor casts ; fish- 

 bones, and ribs of some mammal resembling those of the manatee. No 

 orbitolites were seen. 



Chattahoochee Landing. — At Xew Chattahoochee landing, where the 

 railroad-bridge crosses the river, the bank is chiefly alluvial mud, with 

 fragments of rock from the Chattahoochee limestone. The railway-trestle 

 continues eastward from the bridge, across land submerged at high water, 

 about a mile to a point known as River Junction or Chattahoochee 

 station of the Savannah, Florida and AVestern railroad. Here two roads 

 divide ; one, the above mentioned, extends into Georgia, the other east- 

 ward in northern Florida. Half a mile from the station, on the first 

 mentioned road, there are several cuttings, where, under the usual red 

 beds, 5 to 10 feet in thickness, the Chattahoochee limestone is exposed 

 in place. Here it is a residual rock, claye}^ white and yellowish, with 

 conchoidal exfoliation. The fossils have mostly been removed by solu- 

 tion and their traces are very indistinct, but nearer the station the same 

 rocks are visible in the bottom of an excavation made to obtain mate- 

 rial for an embankment. Here distinct imprints of fossils occur, and 

 even poorly preserved shells in some places. In the first locality the 

 Chattahoochee limestone rises some 5 feet above the track, covered with 

 yellow and ferruginous clayey streaked sand, more clayey at the top, 

 over which is about 3 feet of gray superficial sand and humus. At the 

 second locality the rocks are 8 to 10 feet below the track, and here Burns 

 in 1890 collected Pyrazisinus cornutus, Cerithium hillsboroen^is, Potamides 

 transeda, Conus planiceps, Natica amphora, Lucina hillsboroensis, Cardita 

 serricosta, Venus staminea, V. cancellata, V. penita, Cytherea nuciformis, Cyrena 

 vesica and Orbitolites floridanus. There were among the undetermined 

 species Tagelus, Solen, an echinoid and some obscure corals. 



Aspalaga Bluff' and Section. — About five miles below the bridge, on 

 the left bank, the first prominent bluff" is that at Aspalaga landing. 

 This bluff", which is in township 3 north, range 7 west, section 35, extends 

 half a mile along the river, rising abruptly about 75 feet, and further 

 back attaining a height of perhaps nearl}^ as much more. The upper 

 part of the bluff" is sloping and much obscured by talus and vegetation ; 

 the lower part is nearly vertical, off"ering the thickest single exposure of 

 the Chattahoochee limestone to be found anywhere on the river. The 

 beach comprises a narrow strip of talus, but, from appearances, at least 

 10 feet of limestone exists below that part which is distinctly exposed. 

 The limestone is composed of ill defined, nearly horizontal beds, alter- 

 nating harder and more friable, partly free from organic remains and 

 partly containing tyi)ical Chattahoochee fossils rather poorly preserved. 

 A small piece of this limestone, with Orbitolites and other remains, was 



