A PIECE OF COAL. 
175 
shall see by-and-by. You will find plenty of these 
impressions of plants as you go along the gallery and 
look up at the roof, and with them there will be others 
Fig. 47- 
A piece of shale with impressions of ferns and Calamite stems. 
with spotted stems, or with stems having a curious 
diamond pattern upon them, and many ferns of 
various kinds. 
Next look down at your feet and examine the floor. 
Stigmaria root or underground stem of Sigillaria. 
You will not have to search long before you will 
almost certainly find a piece of stone like that repre- 
sented in Fig. 48, which has also come from Neath 
