GEOLOGY AND PALEONTOLOGY OP THE CANAL ZONE. 569 



definitely recognized, but Professor Berry has identified a Jacksonian 

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

 45 miles southeast of Laredo," and sa} T s 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 Ycgua 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 extensive account of literature will be given. However, it should 

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

 nearly 20 years ago, 1 is valuable in that it gave a summary of opinion 

 up to 1898 ard served as a starting point for subsequent attempts 

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

 mations in the southeastern United States here presented with 

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

 tions or charges in opinion have been rendered necessary because of 

 the acquirement of new information. 



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 2 presents the following table of the 

 names applied to the European "stages": 



......_ . ,.„._. (Marine facies=Cuisian. 



fYpresian (Dumont, 1849) {. ... 



Lower Eocene I Lagoon facies=Laonman. 



ISparnaoian (Dollfup, ]SS0)=Upper Landenian (Mayer Eymar, 1857). 

 Thanetian (Renevier, 1873) = IIeersian (Dumont, 1849), Lower Lan- 

 denian (Mayer Eymar, 1857). 

 Montian (Dewalque, lSfi9)=Paleocene of Von Koenen and others. 

 . (Not of Schimper, 1874.) 



Berry says: "Together these stages correspond to the Eonummu- 

 litic of Haug (1911), to the Sucssonian of D'Orbigny, and to the 

 Paleoccnc of Schimper (1874), but not to the Paleocene of Von 

 Koenen, Dollo, and others, which is limited to the Montian stage." 



1 Dall. W. H.. A table of the North American Tertiary horizons. correlated with one another and with 

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

 1898. 



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



Basal Eocene.- 



