J.D. Dana—Taconic Rocks and Stratigraphy. 219 
on the map point out, the dip in the adjoining limestone on the 
east side is westward, on the south northward, and on the west 
eastward, proving its synclinal character; and, as the angles of 
dip show, the synclinal has its steepest margin on the west and 
northwest sides. Figure 17 represents a section on the east 
Side at 12, where, in a number of outcrops close to the foot of the 
ope the dip is westward. Last of these outcrops about 
R ) yards other opposite or eastward dips occur owing to an 
aticlinal outside of the synclinal. Fig. 18 gives the position of 
rocks on the west side at 13 (E.N.E. of the house of M. T. 
ranger), showing conformability to the schist in the limestone 
Se ious flexures outside of the 
. Suntain synclinal in the next 400 yards, and very bold flex- 
: With in the limestone at the western end of the section. The 
a € limestone ridge of bold flexures is only 40 to 50 yards 
aa two partial sections of it, taken at points 50 yards apart, 
19 about 80 feet in actual length, are represented in figures 
th and 20. The facts illustrate the irregularity and variety of 
€ dips in the limestone remote from the base of the ridge. 
19. 90. 
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BRS ee 
ELT RON 
ORES, 
oj" Southeast of Rattlesnake Mountain and just west of East 
Sera there are six small areas of hard massive quartzyte 
on in the limestone, the largest 1,400 feet long and the 
the est 180 feet. The two larger have their positions given on 
in thi p- These areas are described by the writer in a paper 
't this Jonrnal for March, 1872 (p. 185), and a large map of 
oN 9 
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mat, 
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