214 The Amerlcrui Geohxjht. April, 1895 
are.* Tlu' corals are, if possible, even more decisive than the 
nioUusks; but as only a few of tiie species have been described,, 
their names are not cited, alth(nig-h I have manuscript descrip- 
tions of them and have liad figures of them drawn. 
The age of these beds has already been pointed out by 
Johnson,! Lerch,+ and Harris, g but all three have erred in 
making the Lower Claiborne area too small, and the Jackson 
area too large. 
Lower ('laiborne fossils were collected by the Louisiana 
{Geological Survey at Georgetown, on the railroad from Mon- 
roe to Alexandria, near Little river. This shows the exist- 
ence of Lower (ylai borne strata farther south than has hithertO' 
been recorded. Some of the species are : 
Vohitihthcs ]wtrosiis Con. Scalaria iiassula Con. 
Latiriis mooiTJ Gabb. Vonoricardia plaiiicosta Con. 
Tjuiiatia cmimila Con. Corbula sp. 
I regard the Latirii.s }ii.oorei as indicative of the age of the 
beds. 
Four questions need further discussion: 1st, the Arcadia 
clays; 2d, the small prairies or meadows in Bienville, north- 
ern Winn, and Natchitoches parishes; 8d, the " Upper Lig- 
nitic" of Dr. Lerch ; 4th, the red clays in the vicinity of Mt. 
Lebanon and Arcadia. 
The Arcadia cUnjs. Dr. Lerch has described in both Parti 
and Part II of his "Report on the Geology of the Hills of Lou- 
isiana," a series of gray clays, typically exposed in the vicin- 
ity of Arcadia, and which he considered as resting upon the 
eroded surface of the Claiborne strata. To these clays in 
•*Tlie altciitioii of the rt^adcris called especially tu the followiiis- pub- 
licalioiis: 
AVm. M. (iabl): .lour, .\caii. Nal. Sci. Phila., new scr., m)1. iv. p. :!?() 
et seq., bSCul. 
T. H. Aldricii and < ). Merer: .lourn. Ciiin. Soe. Nal. Hisl., vul. ix. 
No. 2. pp. 40-50, ISSI). 
T. H. Aldrich: Prelim. Kep. on llic Terl. Foss. of .Ma. and Miss.. 
Hull. ], Ala. Ceol. Surv., 1SS6. 
A. Heilprin: Proceed. Acad. Nat. Sci. Phila.. IS'.MI. p. :;»;; et seq. 
U. I). Harris, Tert. (Jeol. of Southern Ark.. .\rk.(ieol. Surv.. K.port 
State Ceoioj-ist, for 1S!);>, vol. ii, ISy-i. 
E. T. Diimhle: .Tourn. Geol., vol ii. Xo.ti. IS'.M. pp. .m1 -."■).")."), .")()(). 
Wm. Kennedy: 2d, :{d and 4th Ann. Reports. Slate (ieoloiiist of 're.xas. 
f Iron l^•i■■iolls of I>a. and Texas, p. 20, 1888. 
X Part II. Ceol. Hills of La., p. 82, 1893. 
S Tertiary (ieol. S. Ark., p. 177, 18!)4. Prof. Harris erred in aceeptinj,^ 
the previous work of .lolmson on the ;ireal (list ril)ution. 
