FOSSIL PLANTS. 467 



only fossil plant described from the Nova Scotia Coal Measures, 

 which had not yet been found in Pennsylvania and Ohio, viz : 

 Odontopteris subcuneata, has been found at Mazon creek. The 

 plants of this last place are mostly identical with those of New- 

 port, Rhode Island. Those of coal No. 3, at Colchester and 

 Duquoin, are also mostly the same as those of the Haddoc coal 

 bank at Breathett, Kentucky, of South Salem vein of Potts- 

 ville, Pennsylvania, of Stark county coal in Ohio, etc. Thus, 

 I think, we can readily admit that the contemporaneousness \ 

 of formation is recognizable over the whole extent of our coal 

 fields, not only on a general point of view, but even considering | 

 each separate bed of coal,. 



