242 



BOARD OF AGRICULTURE. 



In the very south-cast corner of Thomaston, we see more of this 

 quartz rock, dipping 55° N. 40° W., and in the south part of the 

 city limits of Rockland the dip is 60° N. T0° W., and 40° S. 70° E. 

 The latter example is the furthest south. Much mica is associated 

 with the quartz here, and all along through Rockland. The city 

 is situated upon this rock, and we iind indications of an anticlinal 

 axis there from our notes — one observation of the dip being 60° N, 

 60° W., and the other 60° southeasterly. It is exhibited in Fig. 38. 

 The quartz rock beyond Rockland passes beneath the bay till it 

 rises again at Jameson's point. It is supposed to occupy the 

 whole of this projection of land, and to be cut off again at Clam 

 cove in Camden. Figs. 39 and 40 show its relation to the schists. 

 North of Clam cove the quartz layers dip 10° N. W. Where this 

 rock appears still further north, to its utmost limit, it is a hyaline 

 or glassy variety, precisely like the typical " granular quartz" 

 of Emmons. A great boss of it a mile south of Rockport dips ap- 

 parently 30° S. E. It may be traced along the whole shore to the 

 inmost corner of Rockport harbor, and would make at almost any 

 portion of its course, an excellent material for the manufacture of 

 glass. 



Fia. 



Explanation of the 



Figure. 

 The scale of this map is 

 the same as that of the 

 Map of Waldo County. 

 The space covered by 

 crosses represents gneiss; 

 the perpendicular or N. & 

 S. lines represent quartz 

 rock ; the horizontal lines 

 represent Eolian lime- 

 stone ; the checked sur- 

 face represents silicious 

 slates and slaty quartz ; 

 the lines inclining to tie 

 right represent a micace- 

 ous quartzite or schist ; 

 the lines inclining to the 

 left are Tacouic schists. 

 The oval space in the cen- 

 tre represents Lily pond. 



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Geology of Rockport and vicinity. 



