DESCRIPTION OF THE GENERAL SECTIONS. 657 



that in central Vermont. The Helderberg fossils described in the Can- 

 ada reports belong to the upper part of the series, or Devonian. The 

 presumption is, therefore, that these limestones upon Massawippi lake 

 are of Devonian age, and therefore different from those of Littleton, Ly- 

 man, Lisbon, and Bernardston, which are so plainly Silurian. 



I regret very much not to have room enough in this volume to present 

 further details of these sections, and catalogues of the specimens ob- 

 tained, as has been done with respect to those collected along Sections 

 X-XIV, on pages 92-97. A hundred pages would be required to set 

 forth all these details in a proper manner. An opportunity may be 

 offered for their presentation in the future, after further study. The 

 facts will not be lost, being preserved in the museum at Hanover, where 

 they will be accessible to any one who may desire to become acquainted 

 with them. 



S3 



