NOTES ON THE TEXAS TERTIAEIES. 
BT E. T. DUMBLE, STATE GEOLOGIST. 
Bead June 19th. 1S94. 
In my report on the geology of Southwest Texas, which is now await¬ 
ing publication as a part of the Fifth Annual Report of the Geological 
Survey of Texas, I have proposed a division of the Tertiary and later 
deposits of the Coastal Plain somewhat different to that which has been 
used in previous reports. This change was made necessary by the new 
stratigraphic evidence secured in making the Nueces section and the re¬ 
sults of the studies # of our collections of fossil shells from various locali¬ 
ties in this area by Prof. Gilbert D. Harris. 
These divisions, with such correlation as seems to be warranted by the 
facts now before us, are: 
f Coast sands, stream deposits, etc. 
Pleistocene .. -! Coast clays.Port Hudson. 
I Equus beds. 
Neocene . . 
f Reynosa—Orange Sand. 
! Lagarto. 
i ° 
| Lapara.Blanco. 
L Oakville—Deep Well. 
Eocene 
Fayette.. ! 
Yegua... j 
Marine .. J 
Lignitic. . . 
_ Basal clays 
Lower Claiborne. 
Lignitic. 
Midway. 
Of these divisions, all below the Fayette have been sufficiently well 
defined in our various publications. The Fayette, however, is now lim¬ 
ited to the basal sandy portion of the beds originally bearing the name, 
a marked characteristic of which, throughout a large portion of its ex¬ 
tent, is the opalized wood it contains. This is succeeded on the Nueces 
by a series of cla}^ which weather white, which are well exposed at the 
mouth of the Frio, and are called the Frio clays. With their deposition 
the Eocene deposits of Texas came to an end, so far as we have any 
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