296 The Aiitertcan Geohxj'ixf. xovmi^r, i8<)2 
ining tiiid Seward counties in tlu' .same .state. This statement is 
made on the authority of J. S. l)iller,of tlie United States Greolog- 
ical survey, who has examined samples from all these localities 
microscopically. This ditt'ers in being stained with oxide of iron, 
and tlie sharp angular grains are coated with carbonate of lime. 
Like the rest it contains with tlie finely pulverized glass, a few 
rounded grains of ([uartz and angular grains of feldspar less thau 
.(12 of a millimeter in diameter. The dust is such as is carried 
tlirough the air from volcanoes. The sand grains and occasional 
diatoms indicate its deposition in still water. 
The following is a section of the bluff containing the volcanic 
dust stratum: 
Twenty-five to tliirty feet — Loess, exposed as much more on 
slope above. 
Seven feet — Stratified yellow clayey loam, with many calcare- 
ous concretions. 
One and one-half feet — Volcanic dust, stained with iron oxide. 
Five feet — Yellow clayey loam, slightly stratified. 
One-half foot — Fine gray sand. 
Twenty feet — Coarse sand and pebbles obliquely stratified. 
Fifteen feet — Unlvnown, probalily in i)art blue till. Level of 
the Missouri river. 
Tills locality is the most eastern exposure of the volcanic dust 
stratum which is found scattered over most of Nebraska. Dili- 
gent search has as yet failed to discover it on the Iowa side of 
the Missouri. 
NEW DISCOVERIES AT BAOUSSE ROUSSE, NEAR 
MENTONE. 
By the MAiu^ris: Dk Ma^.^ili-.^c. 
I know of no discovery touching pre-historic times more re- 
niarkal)le than those made in the caves of Baoussc Roussc. be- 
tween Mentone and Yentimiglia, on the lK)rders of France and 
Italy. These caves were first discovered in 1872 In' Mr. Riviere. 
Since that time this learned gentleman has vigorously prosecuted 
his excavations,* and they have yielded numerous human skele- 
tons, all belonging to the celebrated Cro-Magnon race, who at the 
end of the Quaternary pei'iod, or perhaps at the beginning of 
*They are related at len>;th in "L'Antiquiti' de I'homuie dans les Alpes 
maritimes." Paris, L B. Bailliere et lils, 1887. 
