128 
ON COALBROOK DALE. 
VII. Terrestrial. Ferns and large plants. 
VIII. Fhiviatile or Marine. Fishes, Me- 
galicthys. Gyracantlius. 
IX. Terrestrial. Tluviatile. Large plants. 
Unio. 
X. Marine. Terrestrial. Tluviatile. Plants. 
Unios, Fishes, Trilobites. 
XI. Ter restnal. Large plants. 
XII. Marine or Fluviatile. Fishes. Unio. 
XIII. TerrestriaL Coal. Large plants. 
XIV. Marine and Fluviatile. Ironstone 
Leptoena. Spirifer. Bellerophon Nau¬ 
tilus. Fishes. 
XV. Terrestrial. Fluviatile. Large plants 
and trees. Sigillaria. Lepidodendron. 
Calarnites. Ferns. Unios. 
Base. Silurian Rocks.* 
With such proofs of the existence and 
growth of large trees and plants^ it is im¬ 
possible to doubt the occurrence of vast 
forests common to both continents during 
the coal epoch, and in both composed of the 
same vegetation. The monotony of veget¬ 
able character is only the index to an uni¬ 
formity of causes and of phenomena preva¬ 
lent during that period,but entirely unkno\Mi 
♦ Geol. Transactions, 2ud series, vol 5, part 3. 
