FOSSIL COAL PLANTS. 227 
+ 
observe it. It probably had been rooted in the thin slate seam, between the coal and the 
rock. A siliceous cast of a second stigmaria, apparently of another species, was obtained 
from the sandstone above. As similar sandstone casts of Stigmaria are among the com- 
monest fossils found among the superficial debris of this carboniferous region, it can 
scarcely be maintained, with strict propriety, that these plants are limited to the soft 
argillaceous beds upon which the coal seams repose. ‘Time and extended observation 
will determine the value of the rule. It will then perhaps be found that every bed of 
clay, embraced within the true limits of coal fields, contains a greater or less amount of 
these exuvie; such clay being the natural position in which they grew and were sus- 
tained. 
The following are the principal fossil plants referred to in the foregoing article. It is 
avowedly very incomplete;—an approximation, merely; and many are omitted 
PLANTS IN THE ROOF OF THE COAL SEAM. 
A. Brongniart pl. 146,—and pl. 158, fig. 1. 
Sigillaria elegans, 
Sternberg Tab. xii., also, some leaves. 
Stigmaria ficoides, 
Lycopodiolites elegans, . . Tab. xvi., sandstone cast. 
IRNOMTIa TMDTICNIe ee eS CN y Tab. xxvii., sandstone above the conglomerate. 
Lepidodendron—?—smaller than L. obovatum, & Tab. vi., cast in sandstone. 
“ «”-— Volimannianiit, © fw es “ WP EUs lilly ty Os 
PLANTS IN THE UNDER CLAY OR FLOOR. 
Sigillaria elegans, . . . . . . . « . A. Brongniart, pl. 146, 158. 
“ elongata? . . pl. 145, doubtful. 
Me laevigata, bn pl. 143, 3d larger than Brongniart’s fig. 
us pachydermata? ae pe . pl. 150, 2. 
Ly COnMOrMIa! 4A PA a “ pl. 142, doubtful. 
Syringodendron? . no cicatrices visible, . Sternberg. 
Stigmaria ficoides, i vets “« Tab. xii., with leaves in contact. 
Sphenopteris delicatulan . . . . . . . A. Brongniart pl. 58, fire clay outcrop. 
he elogans, .. . . . « . « . Sternberg Tab. xx, 3, 4, (second index,) Da. 
Lepidodendron Volkmannianum, . . . . Sternberg Tab. liii., f. 3. 
“ rimosum, “ Tab. x., very thick bark. 
Nevropteris plicata, ves eK Tab. xix., (second series.) 
“ Loshiiy 40) . 04.4 «<A, Brongniart pl. 78, fite clay outcrop. 
Pecopteris long chitica? M pl. 84 and 128, outerop. 
4“ miltoni? , A pl. 114, outcrop. 
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