15 



these two series of beds having a combined thickness of about 600 

 feet. His three divisions of the Eocene correspond to Ruffin's "Great 

 Carolinian Bed." 



Tuomey's Pliocene deposits are irregularly scattered over the 

 State, and it must be borne in mind that his Pliocene includes both 

 the Miocene and the Pliocene as now distinguished. First will be con- 

 sidered that part of his Pliocene which is known to be Miocene. He 

 found it in patches resting on the Eocene at Goose Creek, then about 

 Sumter, Darlington, and Florence, especially on Lynches River, 

 Black Creek, and Swift Creek. On the Peedee he also found ex- 

 posures of what he called Pliocene. Though this region has not been 

 thoroughly investigated, the supposition now is that this too is Mio- 

 cene. Now will be taken up what has clearly been shown to be 

 Pliocene. On the Waccamaw the Pliocene was found exposed from 

 a few miles above Conway on up to or very nearly to the North 

 Carolina line. He gives two sections of the river bank which are, 

 in the main, characteristic of the entire length of the formation ex- 

 posed along the Waccamaw : 



(1) The section three or four miles below Nixonville at the old 

 William Nixon Place : 



Yellow sand, showing false stratification and very 



undulating on the surface 30 to 40 feet 



Yellow Pliocene marls 8 to 12 feet 



Beds of Cretaceous formation 8 feet 



(2) Section on Tilly's Lake at Nixonville: 



Overlying loose sand and clay 30 feet 



Pliocene marl 10 feet 



Cretaceous formation, Exogyra costata 2 feet 



It may be well to state just here that Johnson found the Pliocene 

 along the Lake at Conway for some distance up the stream, and 

 also found it lower down the Waccamaw than did Tuomey. Lists 

 of fossils from the several Pliocene localities were given and all 

 summed up in the tables here reproduced : 



Number of species. Species recent. Percent. 



Brachiopoda 1 o 



Gastropoda 78 39 50 



Lamellibranchiata 109 47 43 



Cirripedia 2 I 50 



Total 190 87 46 



