CHAPTER IX. 



DESCRIPTION OF THE GENERAL SECTIONS. 



•HE conduct of the geological survey of New Hampshire has been 

 based upon the careful measurement and delineation of fourteen 

 sections, crossing the state at regular intervals. These have been drawn 

 several times during the progress of the work, for the museum and for 

 study. Their final representation may be seen upon the geological map 

 in the atlas. Lines are drawn to indicate their positions through the 

 various townships, while the projections appear at the bottom of the sev- 

 eral sheets, so placed that the eye can readily connect the profiles and 

 geological coloring. These sections are drawn upon the same horizontal 

 and vertical scale. Our conclusions as to the age and equivalency of the 

 formations are based upon these delineations. 



The museums of the New Hampshire College of Agriculture and the 

 Normal School contain the specimens procured for these sections, both 

 for New Hampshire and Vermont, those from the latter state having been 

 obtained at private expense by special trips taken for the purpose. The 

 shelves of the first-named museum show the perfected arrangement, and 

 it is to be hoped the same will be true of the collection at Plymouth. 

 At Culver hall a wall forty feet long is devoted to this set of specimens. 

 Fourteen shelves are arranged in order, one over another, from the floor 

 to the ceiling. Care is taken not to impede the view of the colored pro- 

 files between the shelves by braces or railing in the gallery, so that the 

 visitor may take in the whole structure at a single glance. The speci- 



