OLD RED SANDSTONE. 
167 
The plants which are named by Mons. 
Adolphe Brogniart as having been discov¬ 
ered in these strata^ fTevvcihi de tvciusitioifi) 
are, four Fucoids, two Calamites, three 
Ferns, two Sigillaria, and one Lepidoden- 
dron, but he leaves it doubtful whether the 
land plants do not belong to the base of the 
coal formation. The present result of re¬ 
searches into the deposits below the mountain 
limestone, is that no decided trace of land 
is to be found. Mr. Miller says of the old 
red sandstone in his graphic and able book 
on that formation, “ The vegetable remains 
of the formation are numerous but obscure, 
consisting mostly of carbonaceous markings, 
such as might be formed by comminuted 
sea-weed. Some of the impressions fork 
into branches at acute angles : some affect 
a waved outline ; most of them however 
are strait and undivided. They lie in some 
places so thickly in layers as to give the 
stone in which they occur a slaty character. 
One of my specimens shews minute mark¬ 
ings, somewhat resembling the bird-like 
eyes of the Stigmaria Ficoides of the coal 
measures; the branches of another termi- 
