372 APPENDIX TO PARTS I AND Il, 
the Green Mountain gneiss, which Logan considered to be a metamorphic variety of 
the Sillery formation, overlying the Lauzon. As shown in my sections in the Vermont 
geological report (1861), this group everywhere underlies the Huronian, and is there- 
fore older. With this exception, I find no fault with Logan’s representation of the for- 
mations, but differ from him in placing the Lauzon below instead of above the Levis. 
Had I occasion to map the ground de novo, I should probably not use any of these 
terms. The limits of these groups have been stated upon page 463, Volume II. 
I have elsewhere pointed out the anticlinal structure of the Green Mountains. This 
fact authorizes the deduction that the formations upon both its flanks are of more mod- 
ern age, and that the Green Mountain gneiss is essentially Montalban, and underneath 
the Huronian. Essex county, Vt., is represented very differently from the delineations 
of the state geological map. 
The additions to the Maine part of our sheets are entirely original contributions from 
our survey. Want of space prevents a description of the details south from the Andros- 
coggin lakes. 
I regret much not to have had sufficient time to incorporate all the observations of 
the position of strata throughout the state upon the map by appropriate symbols. The 
necessity of having every part of the work completed by a specified date has not given 
us sufficient time to perform this task. The conclusions to be derived from such delin- 
eations have been approximately presented in Pl. XXVI, Volume II. 
The maps were executed by Julius Bien, of New York, and are not surpassed, for 
excellence of finish in the coloring or engraving, by any similar work heretofore issued 
in the United States. 
APPENDIX Lf. 
PANORAMIC VIEWS. 
- Allusion has been made in Volume I to a number of panoramic views taken from 
several of the White Mountain summits, by G. F. Morse, of Portland, Me. Owing toa 
change in the size of the Atlas, it was found necessary to re-draw these hand sketches, 
and they are all sketched upon two of the large sheets. Upon the first appear pano- 
ramas from Mt. Washington and Tremont, covering the entire horizon, divided into two 
parts by the points of compass. The upper begins at the west, and terminates at the 
east, the eye looking northerly. The lower view commences where the first leaves off, 
the eye being directed southerly. The same remarks apply to the panoramic views 
from Mts. Carrigain and Chocorua upon the second sheet. Both sheets also contain 
several other profile views, covering only a small part of the circuit, being designed to 
present the aspect of important or interesting ranges. 
Another sheet has been prepared in a different style, by J. Rayner Edmands, with 
