320 Hutt—0On the Geological Age of the North Atlantic Ocean. 
EXPLANATION OF PLATE VIII. 
Fic. 1.—This Map is intended to represent approximately the position of the land and submerged 
areas towards the close of the Carboniferous epoch, as based on observation and inference. The 
grounds on which it is constructed have been sufficiently indicated in the text. 
Fic. 2.—These Diagramatic Sections are an attempt to represent to the eye the manner in which 
the Carboniferous sedimentary strata swell out towards the centre of the North Atlantic on opposite 
sides of this ocean, and how the Calcareous strata are distributed on an opposite plan of formation. No 
attemptiat scale is possible over so vast an area. 
Fie. 3 represents the same phenomena in the case of the Lower Silurian beds. The grounds have 
already been sufficiently explained in the text. 
