212 J.D. Dana—Taconice Rocks and Stratigraphy. 
ao ees sections of the hill in which limestone 
= 
SS comes into view. 
SS This high bluff, within a hundred 
yards of its south end, changes abruptly 
to schist from top to bottom. A fault 
intervenes, which is covered on the front 
a by a great triangular mass of schist-topped 
Rees limestone, which has slid down from 
By aes above. The direction of the fault is from 
ae “east to west, or about west southwest- 
ward ; it appears to be the same that gives an abrupt southern 
limit to the limestone area No. 2’ (see map). 
At 2, the summit of Gallows Hill, there is another limestone 
bluff, rising out of a small limestone area. It faces westward, 
trends N. 40° W., and has its beds dipping 15° in the direction 
N. 10°-20° E. The bluff is limestone to the top, but it has 4 
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8 
cap of schist just east of its highest point as represented in fig. 
2. Another section, from a low ledge a hundred yards farther 
south, is shown in fig. 3, the schist and limestone in contact. 
In another ridge on this same area to the southeastward of 
the first, the upper half is schist and the rest limestone, and the 
dip is westward (N. 29° W.). The outcrops indicate irregular 
fracturings and faultings along the region in a northwestwa 
direction. 
A third prominent line of fault occurs at 2’ where sae 
another nearly parallel limestone blu 
facing west. A cap of mica schist covers 
the top and in some parts makes a ‘ 
jecting brow, as shown in fig. 4. e 
limestone at all the localities is impur® 
though coarsely crystalline, and_ here 
there is a Jayer of mica schist 25 feet 
‘ thick, besides thinner intercalations. i 
At 3, just north of the last locality, are two narrow paralle 
