358 BOARD OF AGRICULTURE. 



man, as he observed the tops of the pines shooting up above the 

 other trees, that " there was yet a good chance to lumber here," 

 notwithstanding there had been so much ah-eady taken away. 



After leaving the lake we came to a long stretch of swilt water. 

 Near the upper part of this, and a short distance below the outlet, 

 there occurs a series of ledges, extending across the river, over 

 which the water rushes, falling within the distance of four rods, 

 twelve or fourteen feet. At the upper part of the falls is clay slate, 

 a less micaceous variety than that seen above, having a dip of 45° 

 north 35° west, the strike of course being at right angles to it, or 

 nearly north-east and south-west. Then comes an interstratification 

 of several, not very thick, beds of fine-grained conglomerate, exactly 

 identical in appearance and structure with what we had already 

 seen on the lake. These beds are irregular in thickness, and seem 

 to pass into the slate by insensible degrees, so that there is no 

 definite line of demarcation between them. The lower portion of 

 the falls is made up of a distinctly stratified, blue arenaceous rock, 

 containing quite a per cent, of carbonate of lime. Some five or 

 six feet of the terminal portion of this strata becomes of a red color, 

 produced by a partial disintegration and peroxidizing of the iron, 

 thus exhibiting more perfectly its arenaceous character. The dip 

 of this last bed is greater than that above, and I suspect that furth- 

 er investigation would show that the former is superimposed 

 unconformably upon the latter. This was the last place where we 

 observed the characteristic formations of east Cauquomgomoc. 

 From here to Black pond the underlying rock is clay slate, as exhi- 

 bited in two or three ledges in which the strata are perpendicular, 

 the strike being north-east and south-west. 



There is nothing of particular interest about the geology of 

 Black pond. The north-east shore is lined with ledges of clay 

 slate, upon which we made the following observations : First after 

 entering, dip 80° north 35° west. Near this is an embossed rock, 

 with striae having a direction of north 10° east. The ledge mid- 

 way has a dip of 15° north 35° east. A short distance beyond 

 this again the dip is 45° north 30° east, and the cleavage planes are 

 very perfect. I counted four or five other ledges having essen- 

 tially the same dip. We saw no outcrops on the south-east shore, 

 and from its flat character we inferred there were none. 



From here down to Chesuncook lake we encountered two con- 

 siderable falls and a few ledges composed of trap identical with 



