268 Notice on Vegetable Fossils. 
profit, and of a branch of industry hitherto. unknown to 
S. , 
Confining ourselves to the examination of that part of the 
mine of Treuil which is represented in the plate, we may 
remark, in proceeding from the lower terrace to the surface 
of the ground : 
Ist. A stratum of a micaceous coal slate, ‘‘ Phyllade 
charbonneuse pailletée” S, which is soon followed by a bed 
of coal, H, whichis about 15 decimeters (near 5 feet) 
? 
_ 2nd. A second layer of the same schiste and Phyllade S, 
but thicker than the former, and containing in its lower re- 
gions, and very near to the bed of coal, four beds of compact 
carbonate of iron, in flattened nodules, F, of different sizes, 
and completely separated from each other; or in large 
plates, swelled towards the middle, accompanied, covered, 
and even penetrated by vegetable remains; 
3rd as the second terrace above this bed of schist, 
another bed of coal which is from 46 to 50 centimetres (18 
to 194 inches) in thickness, and which is covered with a 
those above described. 
The schists and the iron ore are accompanied by a 
aap number of vegetable impressions which cover and fol- 
w all the contours of their surfaces ; 
4th, and lastly. Here terminates the coal formation by 
presenting a bed 3 to 4 metres (10 to 4° feet) in thickness, 
of micaceous psammite, sometimes offering simply fissures 
in different directions, sometimes very distinctly stratified 
and even passing to the structure of large laminz. ; 
In this bed, and throughout a very large extent, are found 
a great number of trunks, placed in a vertical position, trav- 
pei all the layers of the bed, only a small portion of 
which are seen in the plate which accompanies this notice- 
It is a real fossil forest of monocotyledonous vegetables, 9 
_ appearance resembling bamboos or the large equssetum, 
petrified on the spot. 
Although the strata are, in this place, almost perfectly 
horizontal, it may, nevertheless, be perceived that a move 
