268 Notice on Vegetable Fossils. 
profit, and of a branch of industry hitherto waknown, te 
us. 
Confining ourselves to the examination of that pert of the 
mine of Treuil which is represented in the plate; we may 
remark, in proceeding from the lower terrace to the sunigoe 
of the sround : 
Ist.-A> stratum of a micaceous coal slate, * Phyllade 
charbonneuse pailietée” S, which is soon followed by a bed 
of coal, H, which is about 15. decimeters (near 5 feet) 
thick ; 
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. evea penetrated by vegetable remains; 
3rd. And, as the second terrace above this bed of schist, 
another bed of coal whichis from 46 to 50 centimetres (18 
to 194 inches) in thickness, and which is covered with a 
bed, composed of schistose clay, S, similar to the lower one, 
of four or five thin layers of coal, and, near its upper part, 
of three or four very thin and closely connected beds of 
compact carbonate of iron, F, in every respect similar to 
those above’ described. 
_. The schists and the iron ore are. decorapaniod by . 
great vumber of vegetable impressions which cover and fol- 
low ali the contours of their surfaces ; 
-. 4th, and lastly. Here. terminates. the coal formation by 
presenting a bed 3 to 4 metres (10 to 13 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 lamina. 
In this bed, and throughout a very large extent, are found 
a great number of trunks, placed in a vertical position, trav- 
ersing all the layers of the bed, only a small. portion. of 
which are seen in the plate whith accompanies this notice. 
- It is a real fossil forest of monocotyledonous vegetables, in 
appearance resembling bamboos or the large equisetum, 
petrified on the spot. 
Although the strata are, in this place, almost perfectly 
horizontal, it may, nevertheless, be perceived that a move- 
