﻿GEOLOGY AND PALEONTOLOGY OF THE CANAL ZONE. 569 



definitely recognized, but Professor Berry has identified a Jacksonian 

 flora, collected by Mr. Matson, "4^ miles north of Miraflores Ranch, 

 45 miles southeast of Laredo," and says in a letter: ''I consider the 

 Miraflores Ranch outcrops as Fayette sandstone and of lower Jackson 

 age. I am sure that it is not upper Claiborne; in fact, I believe that 

 a part of the Yegua in the Texas area is also lower Jackson in age." 

 The Frio clay is represented by clays that contain abundant speci- 

 mens of Ostrea georgiana. The importance of these notes in this 

 connection consists in showing that marine deposits of Jackson age 

 extend to Rio Grande, but the strike veers southward in conformity 

 with the trends of the shore of the Gulf of Mexico and of the moun- 

 tains in eastern Mexico. 



Correlation of the Tertiary Formations of the Southeastern United States 

 "WITH European Subdivisions of the Tertiary. 



EOCENE. 



As the remarks to be made here are intended to be only a summary, 

 no extorsive account of literature will be given. However, it should 

 be mentioned that Dr. W. H. Dall's correlation table, published 

 nearly 20 years ago,^ is valuable m that it gave a summary of ophnon 

 up to 1898 ard served as a startirg poiiit for subsequent attempts 

 of a similar kind. A comparison of the correlation table of the for- 

 matioT s in the southeastern United States here presented with 

 Doctor Dall's shows that durii g the past 20 years many modifica- 

 tio s or changes in opii ion have been rendered nccessaiy because of 

 the acquiremer t of new ii formation. 



The most recent discussion of the European equivalence of the 

 lower Tertiary deposits of the Coastal Plain is that of Berry, who 

 in his lower Eocene floras^ presents the following table of the 

 names applied to the European "stages": 



^ • /T\ i no^r>\ fMarine facies=Ciiisian. 



fYpresian (Dumont, 1849) <, , . , 



Lower Eocene-^ I Lagoon iacies=Laonnian. 



ISparnacian (Dollfu?, lS80)=Upper Landenian (Mayer Eymar, 1857). 



Thanetian (Renevier, lS73)=IIeersian (Dumont, 1849), Lower Lan- 



Basal Eocene. ^^"^^" (^^^^e'' ^ymar, 1857). 



Montian (Dewalque, IS 09)= Pal eocene of Von Koenen and others. 

 (Not of Schimpcr, 1874.) 



Berry says: "Together these stages correspo-'d to the EoMummu- 

 litic of Haug (1911), to the Suessonian of D'Orbig-iy, and to the 

 Palcoccre of Schimpcr (1874), but not to the Paleocene of Von 

 Koenen, Dollo, a-^d others, which is limited to the Montian stage." 



• Dall. \V. H.. A tablo of the North American Tertiary horizons, correlated with one another and with 

 those of western Europe, with annotations, U. S. Geol. Survey Eighteenth Ann." Rept., pt. 2, pp. 323-348, 

 1898. 



' U. S. Geol. Survey Prof. Paper 91, pp. 140-152. 



