218 Notice of the Malleable lege of Louisiane. 
beginning at the bottom, are as . follows : : 1. Gray wacke 
slate, ina detached hillock. Then a sloping massof debris — 
2 Mica slate, (phyllade micacé,) blackish, very har 1. 
Compaci greyish limestone, alternating with and les de- 
-structible than 2. ‘Towards the upper part, a compact black- 
ish gray limestone, full of numerous veins of calcareous 
spar, alternating with 2. A second mass of debris. —4. 
Mica slate, very fissile and friable, traversed in every direc- 
tion by dedaey beds of white calcareous spar, and veins of 
quartz.—5. Psammite Schistorde, very compact, but very 
fissile. A third mass of debris.—6. Very compact grayish 
limestone, with veins of steatite and chlorite, forming in 
some strata a coarse steatitic breccia; also veined with cal- 
careous spar i short dodecahedra.—7. Micaceous and 
quartzeous psammite, in thick beds, alternating with mica 
slate, and black schastose psammuite. aoe Very delicate and 
friable mica slate, yellowish externally, blackish internally. 
—All these strata break off at the S. and dip N. W. The 
declivity of the summits is from E. to W. Above all these 
strata, on the highest peak, nearly always covered with 
snow, is the rock containing shells referred by M. B. to the 
chalk formation. It is a very hard, compact limestone, 
coarse grained or sub-lamellar, blackish, and when dissolv- 
ed in nitric acid, leaving behind much carbonaceous mat- 
ter, full of dark green grains, insoluble (like the green sand} 
in nitric acid; above, it is a granular, micaceous, whitish 
gray limestone, similar to chalk tufa. The fossils in these up- 
per strata are moulds or rather relievos in the cavity. of: ‘decay- 
ed shells. ‘They are grouped and compacted very irregu- 
larly; but are still sufficiently distinct to be recognized. 
They are analogous to those of Rouen, Perte du Rhone, 
Folkstone, and even Paris. There are no belemnites nor 
terebratulas, which are always rare in the inferior chalk. 
Ammonites are found in the lower transition strata, as well 
as in these upper strata, but of an entirely distinct charac- 
ter. 
Art. Ill.—Notice of the Malleable Iron of Loutstana. 
In the year 1810 Dr. Bruce published a brief notice of 
the great mass of Malleable Iron, from the south western part 
