The Stratifiraphii of X. W. Loui.siund . — Vavjjhon. 209 
are occasionally impure limestone. Apparently, beds in one 
place bearing marine fossils, ma}" in other places be repre- 
sented by beds of the same age devoid of animal remains. 
Therefore, it is not at present possible to subdivide and cor- 
relate with accuracy all of the strata belonging to the Eocene 
period found in Louisiana. 
The following are approximately the limits of the area oc- 
cupied by the strata belonging to this period in Louisiana: 
On the north and west the Eocene of this state is continuous 
with that of Arkansas and Texas, on the south the boundarj'- 
is formed by the Grand Gulf Miocene. This Miocene parting 
runs from a few miles south of Rosefield in Catahoula parish, 
by Centreville in the same parish, crossing Little river five or 
six miles below Georgetown, reaching the Red river five miles 
north of Colfax in Grant parish, and the Sabine river near 
the mouth of Bayou Negrut.* 
Dr. Lerch has divided the Eocene as follows : 
Vicksbiu'g. 
Jackson, 
Arciidia clays, | 
Upper Lif^nilic. 
Marine Claibornt-, 
Lower Lijrnitic. 
Provisional names. 
I shall propose the following scheme : 
Vicksburg. 
(Intervening lignitic clays.) 
Jackson. 
Cocksficld Ferry beds (ecjuivalcnt, in a ui-iH'ral way. to the 
Claiborne sands of Alabama). 
Lower Claiborne, including' Oxtini se/ldforniiis beds, Lisbon 
beds, and Buhrstone. 
Fjignitic. 
Lignitic Stage . 
If this formation occurs in Louisiana it is onl}" in the 
northwestern corner of ("addo parish and probabh' at Shreve- 
port. I have seen at Port Caddo Landing in Harrison county, 
Texas, which adjoins Caddo parish, strata that I consider lig- 
nitic. If this point is connected with the point where Mr. 
Harris' Lignitic-Claiborne parting, as shown on his map of 
southern Arkansas, reaches the Arkansas-Louisiana state line, 
*Some of the above data are taken from Hopkins: 1st. Ann. Rep. of 
La. Slate (ieol. Surv.. p. lt!». for iSfi!). pub. ISTO. 
