J. D. Dana—Taconic Rocks and Stratigraphy. 401 
rington, and east of Long Lake Valley), which consists mostly 
of quartzyte, but has quartzytic limestone within it, and lime- 
stone on the west side and arenaceous mica schist near the east 
base in Williams River Valley. At the outcrop the limestone 
portion of the quartzyte, as developed by erosion, shows that 
the dip of the quartzyte is beyond question conformable to 
that of the limestone. 
Sections 29, 30 (map). Section 29 crosses the northern part 
of the schist ridge Tom Ball, where it is a tray-like synclinal, 
and 380 the middle portion where, as farther south, it 1s a ca- 
reened synclinal. The number 29 on the map (back of a house 
near the bridge over the river) shows where the westward dip 
of the limestone underneath the schist may be observed. At 
this place, on the east side of the river and railroad, the lime- 
stone dips eastward, indicating an anticlinal in it crossing the 
valley. - The high ridge of West Stockbridge called Maple 
Hill commences with a high eastward dip just north of where 
Tom Ball ends, and widens northward. 
Section 31. On the north side cf an east-and-west road a 
mile north of Housatonic Village (a road leaving the Housa- 
tonic Valley nearly opposite the ‘““Old Furnace.” It shows a 
low limestone anticlinal with mica schist covering either side. 
A short distance to the northward of the localitv, the middle 
and eastern sides are cut away by denudation; the western 
continues northward as a ridge having a top of schist and a 
high base of limestone. both dipping westward as in the sec- 
tion. Southward the limestone disappears beneath the schist, 
the eastern part of which dips eastward toward Monument 
Mountain (only a mile distant on the east of the Housatonic) 
and becomes apparently the lower schist of the west end of the 
mountain with limestone beneath it. 
To the southwestward of the above (see map) occurs a low 
narrow ridge which consists of quartzyte, and corresponds ap- 
parently to the overlying quartzyte of the same (west) part of 
Monument Mountain; and on its west side it is mica schist, 
answering to the schist of the mountain overlying the saine 
quartzyte. The same rocks outcrop farther south through, 
and by the west side of Housatonic Village. 
Sections 32, 38. On the road between Glendale and the 
Williams River Valley in North Stockbridge, and north side 
of road, at the south end of a spur of Lenox Mountain. Sec- 
tion 32 shows the very nearly horizontal position of the schist 
(a hydromica schist that approaches closely mica schist) and 
underlying limestone. Nearly thesame dip may be seen farther 
west where the road descends into Williams River Valley. 
The limestone extends up 200 feet above the valley on the 
steep side of the inountain, and a railroad runs near the junc- 
