﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 567 



the Eocene and lower Oligocene Bryozoa of the Coastal Plain for pub- 

 Ucation by the United States National Museum; Miss Julia Gardner 

 has completed the manuscript of a monograph on the Mollusca 

 of the Chipola marl, Oak Grove sand, and Shoal River marl members 

 of the Alum BluU formation ; and Dr. C. W. Cooke has completed 

 the field work of a geologic reconnaissance of the Coastal Plain of 

 South Carolina, on a scale of 1 : 500,000. The results of all this un- 

 published work have been available to me, and I have utilized them 

 in preparing the correlation table. 



The only specific correlations that it seems desirable to discuss in 

 this connection are those of the upper Eocene of Texas. Dumble, 

 in his papers akeady cited, represents upper Claibornian deposits as 

 being absent in Texas, referring his Fayette and Yegua formations 

 to the lower Claiborne, while tiie Frio is placed doubtfully in the 

 same division of the Claiborne. The Faj^ette overlies the Yegua^ 

 which is the same as the formation to vrhicli I applied the name 

 " Cocksfield Ferry beds " in 1895.^ In my papers cited below ^ I made 

 it perfectly clear that that formation overlies the lower Claiborne 

 deposits, to which Harris later applied the name St. Maurice forma- 

 tion, and underlies the marine fossiliferous Jackson as exposed on 

 Eed River at Montgomery, Louisiana, and that it must include the 

 deposits in Louisiana that are the stratigraphic equivalent of the 

 upper Claiborne, subsequently designated Gosport sand, of Alabama. 

 There was no escape from this correlation at the time I made it, and 

 it has subsequently been repeatedly corroborated by others. 

 Although the basal part of the Yegua is probably the equivalent of 

 the upper part of the lower Claiborne Lisbon formation, the greater 

 part of the Yegua is of upper Claiborne age, and it is the Texas cor- 

 relative of the Gosport sand of Alabama. Berry's unpublished 

 studies of the middle and upper Eocene floras of southeastern North 

 America supply further corroboration of this correlation, and he au- 

 thorizes me to say that some of the upper beds of the Yegua may 

 be of lower Jackson age. 



So long ago as 1902 Miss Maury published the following sl^atement 

 regarding the Fayette sandstone: ^ 



In 1895 Mr. William Kennedy ^ referred both the Fayette sandstone and the Frio, 

 clays to the lower Claiborne because of the presence of Vcncricardia planicosta in the 

 sandstones. Mr. Veatch, during the winter of 1902, has examined the sandstones and 

 finds Venericardia planicosta is limited to the basal layers of the formation. These 

 he refers to the Jackson. 



1 Vaughan, T. W., Stratigraphy of northwestern Louisiana, Amer. Geologist, voi. 15, pp. 205-229, pi. 9, 

 1895; A brief contribution to the geology and paleontology of northwestern Louisiana, U. S. Geol. Survey 

 Bull. 142, pp. 65, 4 pis., 1896. 



2 Maury, Carlotta J., A comparison of the Oligocene of western Europe and the southern United States, 

 Bull. Amer. Paleontology, vol. 3, p. 80, 1902. 



' Kennedy, William, Eocene Tertiary of Texas, Acad. Nat. Sci. Philadelphia Proc. for 1895, pp. 92, 98, 

 1895. 



