512 PROCEEDINGS OF PHILADELPHIA MEETING. 



partially converted into schists. The Swift Water series of the report will probably 

 be found intimately connected with the fossiliferous bands. 



Correlation 



It is worthy of note that the Canadian geologists now refer the extension of the 

 calciferous mica-schist to the Cambro-Silurian because of the presence of Trenton 

 graptoiites as determined by Lapworth. The earlier determination of Niagara was 

 based upon outlying patches, which are now supposed to rest upon the older rock 

 and not incor])()rated with it. The terranes referred to the Green Mountain gneiss 

 and Huronian in my report become pre-Cambrian, and Cambrian as they pass into 

 Canada. * 



Remarks were made by B. K. Emerson. 

 The next paper was entitled : 



THE DEVONIAN FORMATIONS OF THE SOUTHERN APPALACHIANS 

 BY C. WILLARI) HAYES 



Remarks were offered by D. W. Langdon, Jr., J. J. Stevenson, Artlmr 

 Keith, C. R. Van Hise and PI. S. Williams. The paper will be published 

 in the Journal of Geology during the coming summer. 



The next two papers were read by the author, with no intermission. 



NOTES ON RELATIONS OF LOWER MEMBERS OF THE COASTAL PLAIN SERIES IN 



SOUTH CAROLINA 



BY N. II. DARTON 



Contents 



Page 



Introduction 612 



Statement of former and present views 513 



Coastal Plain sections in South Carolina 513 



Tlie formations and their characteristics 513 



Potomac formation 514 



Marine Cretaceous formation 517 



Eocene formations 517 



Miocene formations 518 



Lafayette formation 518 



Columbia formation.. 618 



Introduction 



Our principal knowledge of the geology of South Carolina is derived from studies 

 made by Professor Tuomey a half century ago.f Tuomey's investigations covered 

 the greater portion of the Coastal Plain area of the state before the geological 

 survey was discontinued, and while the relations of many of the formations were 



* Bull. Geol. Soc. Amer., vol. 1, p. 453. 



t Report on the Geology of the State of South Carolina, 1846. 



