coos AND ESSEX DISTRICT. 87 



diorite; it is of a light green color, is compact, and weathers to a light 

 greenish gray, and has an easterly dip. Two miles west we find a nar- 

 row band of clay slate; the strata are nearly perpendicular, but dip 

 westerly 80°. A mile west there is a dark gray siliceous schist, passing 

 into a light gray novaculite-schist ; this has also a westerly dip. Fol- 

 lowing this is a light gray siliceous schist, with an easterly dip. At 

 Second lake there is a compact, green chloritic schist, with a westerly 

 dip. Succeeding this on the west is a variety of diorite, interstratified 

 with which is a whetstone grit. These rocks, where they outcrop on the 

 section, have an easterly dip, but in other places the dip is variable. The 

 diorite, with the whetstone grit or arenaceous sandstone-schist, extends 

 three quarters of a mile west of Perry stream. Then there follows on 

 the west an argillaceous schist; some of the bands are hard and compact, 

 with an even cleavage ; but with these there arc dark bands, wrinkled 

 and corrugated, and both contain small cavities filled with a yellowish 

 brown powder, and for a little more than three miles these schists have 

 an easterly dip. Three fourths of a mile west of Indian stream the schist 

 becomes more fissile, the harder bands are less frequent, and in places 

 the rock is hardly distinguishable from common clay slate; but here, as 

 in the more wrinkled varieties, we find the same kind of cavities, only 

 they are sometimes larger, and from near the height of land to Hall's 

 stream the strata have a westerly dip: probably the easterly dip is due 

 to a fault. The height at Hall's stream is 1740 feet. 



Section XIII. 



From the Maine boundary, opposite the Academy grant, for nearly 

 fifteen miles, the primeval forests for the most part cover the entire 

 country, and the surface generally is broken by irregular mountain ridges, 

 and in places there are high, rocky cliffs. On the Maine boundary the 

 rock is a hydro-mica schist. This extends for three quarters of a mile 

 or more up the slope of the ridge to the west, which has an axis of gran- 

 itoid gneiss. On the western slope of this ridge there is a narrow band 

 of mica schist. This is followed by hydro-mica schist, which extends 

 several miles westward. Where the Dead Diamond cuts this rock it has 

 worn a deep gorge, and the place is known as the Narrows, and here 

 crystals of magnetite are quite common. The valley of the Little Dead 



