wn the vicinity of Great Barrington, Mass. 49 
limestone, so gently inclined near f, becomes nearly vertical, 
and the limestone adjoining has the same dip; but in the field 
to the westward the latter falls off in dip within 50 yards to its 
usual small amount, and farther west the beds disappear under 
the mica slate of Williamsville valley. 
. Again, half a mile farther north, near 6 on the map, 
the same schist, as represented at V? in fig. 5,* has the 
same nearly vertical position, the dip being 80° to 70° to the 
eastward, and in part vertical; and the limestone adjoins it with 
an eastward dip of 70°, strike N. 2°-5° E. To the west of the 
brook, along the rising road, this limestone changes its dip to 
62°, and strike to.N. 15°-20° W. ; then, at top of the ascent, to 
40°, and in a few rods to 25° to the eastward, and strike to N. 
40°-60° W., the northing in the dip increasing. At the top of 
the ascent there is a bluff north of the road which consists of 
the western foot, which show that the dip on that side is 45° to 
50° to the eastward, the strike N. 10-20° E. 
A 
‘om Ball ri to the west. 
of schist V1, V°, is oe surface rather gently inclined for more than three 
fourths of its breadth. 
Am. Jour, rag en Vou. V, No. 25.—Jan., 1873. 
* In figure 5, the part above A® is represented too high in proportion to 
height of cig Ba : ri The limestone A’, between cap at 
