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. 
Fig. 48- 
Stigmana 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 
