Chap. XI.] 
DEVONIAN KOCKS— CONCLUSION. 
285 
rarely afforded traces of Land Plants, its central and upper parts in Shet- 
land, Scotland, Devonshire, and Ireland contain, as in North America, 
numerous vegetable remains, including Tree-ferns and probably Calamites. 
We must equally remember that some of these Plants are associated, 
particularly in Scotland, with the peculiar Ichthyolites of this epoch, 
and occur in strata which there also rise out from beneath the lowest 
Carboniferous rocks. 
