The S[r(ifiiiraj>li!i of X. W. Lnuisiuiic. — \' <iv(ilia )i. 219 
Volutilitlies [H'trosiis Cox. Cardium linrrisi. sp. iiov.- 
Ostrea divjiricata Lea. Pteropsis coiiradi Dana. 
Vfiioricardia i>lanif().sla I.,am. 
In man^^ ])laces in northern Louisiana the red sandy chiys 
or sands rest unconforuiabl}^ on the Hlocene, and doubtless be- 
long to the Lafa3'ette of MeGee. 
As it appears to the author that there has been some con- 
fusion of "Lafayette," "Orange sand," etc., with residual de- 
posits, he gives at some length the reasons why he considers 
the superficial clays around Mt. Lebanon and Arcadia resid- 
ual. 
Two hypotheses for the presence of the Lower Claiborne 
fossils in the superficial deposits under discussion present 
themselves: 1st, they may have been transported; 2d, they 
may be in place. The latter hypothesis we regard as the cor- 
rect one for the following reasons. 
1. In Mt. Lebanon, and north and east of that place, many 
of these fossils are found as casts in ferruginous sandstone or 
as ferruginous replacements. One mile north of Mt. Lebanon, 
in a well from a yellowish sand nmny Lower Claiborne fossils 
were collected. In Mt. Lebanon Lower Claiborne fossils were 
found in greenish clays or sands thrown out of a well. Sec- 
tions in these wells and the vicinity^ show that superficial 
strata rest directly upon the subjacent Eocene. 
2. The transition from the Eocene to the superficial depos- 
its can be traced. In fig. 2, plate IX, the glauconitic sands 
pass by oxidation into the 3"ellow sands, and the j^ellow clay 
passes by oxidation into the red. The yellow claj' has fre- 
quently on its surface blotches of red which have been pro- 
(-luced hy oxidation. The transition from the Eocene to the 
surface red clays is seen at Arcadia, six and a half miles south 
of Gibbsland on the La. cV- N. W . railroad, and between five 
and six miles south of (iibbsland on the same road. At the 
latter place in the red clay VeuericanUd. j}I<nii.co.sf(i was 
found, as already noted. 
3. Fossils found in the svell one mile north of ]Mt. Lebanon, 
imbedded in indurated glauconitic sand; are so similar in oc- 
*JL-. Harris has examined the specimens submitted t(» me, and writes 
me tiiat he i'oiind Ihe same species at Walnut Bluff. Oiiacliita river. .\r- 
kaiisas. On ])ai;e 1 fi of li is Arkansas report, the species is referred lu 
as C(irilli(iii sp. 
