CLASSIFICATION OF THE NEW HAMPSHIRE FORMATIONS. 673 



them in Part II, it should be remembered that there has been an oppor- 

 tunity for adding improvements since the printing of the text. Any 

 points of great importance may be noticed hereafter in an appendix to 

 Vol. III. 



Axial Lines. 



It has not been possible, till the last sheet has been printed, to prepare 

 a diagram illustrating some of the principal anticlinal and synclinal lines 

 of elevation or depression throughout the state. The general map is in- 

 tended to show all the important dip-observations that have been taken 

 and mentioned in the text, with a few additions. It may not be practica- 

 ble to draw these lines upon the general map, so I have prepared a small 

 sketch to show the principal ones, both in New Hampshire and Vermont, 

 in Plate XXVI. This is the final summing up of all the multitudinous 

 observations of this report. Very much might be said to good purpose 

 respecting them, but our limits will not permit. This map and the state- 

 ments of the last few pages are the key to Part II. They are the gene- 

 ralizations derived from our entire work, both in the New Hampshire 

 and Vermont surveys. 



The Atlantic Area. 



Since the printing of Chapter I, more knowledge has been acquired 

 respecting the distribution and equivalency of several of the groups in 

 the territory adjacent to us. For example, the upper division of the Nova 

 Scotia Carboniferous (p. 21) has been referred to the American represent- 

 ative of the Permian. The Mascarene series (p. 16) is now definitely 

 known to belong to the Upper Silurian. The Canada reports claim the 

 occurrence of the Medina group in the St. Lawrence valley, while no 

 fossils of the period have yet been discovered in the red slates believed 

 to be of that age. I have brought together upon page 675 a list of the 

 larger stratified groups known to occur in the middle section of the 

 Atlantic area. A comparison of the two columns will show that the 

 later systems are absent from our state, while nearly every one of them 

 is represented in the middle section of the Atlantic area. 



VOL. IL 85 



