222 I'lie Aiiien'cdii Geolofjist. April, 1895 
ck>sely with that whence the Louisiana Survey' fossils that I 
have were obtained. 
Mr. Harris further states: "Dr. K. W. Hilgard* lias inter- 
preted Harlan's locality for Zeuglodon remains as 'about half 
way between C'olumbia and Monroe.' It is very ditticult to 
see how this construction can be ])iit on Harlan's statement." 
I agree with Mr. Harris, and think Dr. Hilgard made a Idpsxs 
penna'. 
North of the line indicated by the above localities for 
Jackson fossils, none have so far been reported by competent 
paleontologists. 
West of the Red river so far not a Jackson fossil has been 
authoritatively reported. f When at Provencal in November 
I drove eight miles south of that place searching for Jackson 
outcrops. In the banks of Santa Barba creek (called by the 
inhabitants Sandy Burg) I found a greenish blue clay con- 
taining calcareous nodules, resembling considerably in litho- 
logic appearance the Jackson at Montgomery. The river has 
a wide valley opposite Montgonierj', so Dr. Lerch had no 
chance to find Jackson fossils while making his section along 
the T. <k P. railway from Alexandria to Mansfield, Along the 
Claiborne-Jackson contact the Sparta sands ol)Scure the older 
geology. 
One point on the northern boundary needs a little further 
discussion. At Georgetown, in the valley of the Little river. 
Lower Claiborne fossils were obtained from a well. Jackson 
fossils, Zeiiylodoii, were found in a railroad cutting at Tullos, 
a few miles east of Little river. It is the opinion of the au- 
thor that the stream has eroded away the Jackson and has 
thus brought the Lower Claiborne near to the surface. 
The southern boundary of the Jackson-Vicksburg has been 
very well traced by Hopkins from the Cuachita to the Ked 
river. The parting runs from a point two miles south of 
*(it"()l. Kecomi. La., p. 8, 1869. 
f At Sabineluwii, Texas, on tlic Sabiiif ri\ci-. Hiluard on [). 20 of liis 
Siif). aiul Fill. Ri'i). of ii Gen], [{('coiiii. Ill' I^a.. mentions iia\iiij.c found 
.lackson fossils. Mr. K. T. Dumbic, in vol. ir. No. (I. of tin- .lournai of 
< Jfoiony, on p. .KiC), referring to tlie Kocene of Texas, writes: '"None of 
llie beds of liie Eocene havinj^' yielded fossils characleristic of horizons 
liighi'r than the Lower C'laiborne. the deposits referable to that series 
are confined to its basal portion." On a map of the Rocene of eastern 
Te.xas, by W. KenniMly, the beds at Sabinetown are represented as ^[<l- 
rinc hcdx] whicli are. accortlini;- Id ^Ir. Duinlile. Lower Claiborne. 
