THE ACADIAN TRIASSIC 



25 



and round. Pinnacle Island is 

 a quarter of a mile long and 130 

 feet in height in the center. 

 Pinnacle Peak is merely an ero- 

 sion pinnacle. East of Egg 

 Island at ebb tide is Egg Rock. 

 At low tide, with a high run of 

 tides, the sea-bottom between 

 the islands and the mainland is 

 left dry except for numerous deep 

 river channels through the soft 

 red clay. 



Moose Island consists of 

 basalt flows on the north, under- 

 lain by red sandstones on the 

 south. On the west end there 

 is a fault between red amygda- 

 loid and the sandstone, with a 

 number of gypsum veins near 

 the contact. On the east side 

 the amygdaloid and basalt above 

 dip north at angles of 45 above 

 the sandstone. At the base of 

 the amygdaloid is greenish- 

 white ash, 2 feet thick, similar 

 to that at Gerrish Mountain. 

 Fletcher's mapping of Moose 

 Island and of the other Islands 

 is largely incorrect. 



Diamond Island consists of 

 a portion of the same basalt 

 flows as on Moose Island and 

 the other islands. The dip of 

 the basalt is about 40 north- 

 east. 



Long Island consists of basalt 

 on the north and sandstone on 



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