50 Foerste — Eocene and Miocene of Georgia and Florida. 



4. Siveigerts Well, 2 miles north of the Thomasville road, 

 and 3 miles northwest of Powell's limesink, shows the same 

 brownish more silicified phase, and contains the so-called con- 

 cretionary sponges, Orbitoides, Pecten, Lncina, Xenophora, 

 and Cerithinm Mariannensis. 



The Coral layer at the base of the Chattahoochee.* 



On our trip down the Flint Piver, Prof. Pumpelly discovered 

 at locality 14, on the bank, at the mouth of a small creek, a great 

 heap of bowlder, containing, among other things, large massive 

 corals. On a subsequent trip with Mr. Alfred Brooks 1 traced 

 these bowlders to locality 14, where the stream cutting down 

 the north slope of a long high ridge, exposes the Chatta- 

 hoochee at the base. In the soft whitish rock near the base of 

 the hill the massive corals occur scattered around very irregu- 

 larly through the white limestone. When in situ, they do 

 not command special attention on account of their numbers, 

 but in the beds of the stream they have accumulated to such 

 an extent, owing to their greater resistance to disintegration, 

 that they at once attract the observer's eye. The rock below 

 with similar lithological features, that is, soft and very white, 

 with few fossils except the concretionary springs, is the Vicks- 

 burg. 



On the trip with Mr. Alfred Brooks, abundant massive 

 coral blocks were found in the river bed at locality lT^-. On 

 the trip with Prof. Pumpelly, the massive corals were found 

 along a wood road leading southwest from Wiley's Landing. 

 They were not numerous but at some localities more were 

 found than at others. Their occurrence was beneath the brec- 

 ciated limestone considered the base of the Chattahoochee. 

 Taken together, these localities would indicate a sort of mild 

 coral bank extending about east and west along the northern 

 face of the present Chattahoochee outcrop along the Flint 

 Piver. The coral locality on Barrows Plantation has already 

 been mentioned. It suggests the presence there of the base of 

 the Chattahoochee. 



The Chattahoochee. 



Wilefs Landing bed. — For paleontological purposes the 

 base of the Chattahoochee can be studied at Wiley's Land- 

 ing, or locality 18. At the river's edge are found pieces 

 of a peculiar white limestone, irregularly cracked, break- 

 ing with a conchoidal fracture, usually quite hard, but also 

 found with the exposed surfaces soft and friable, contain- 



* Loc. cit., page 447. 



