Geology of the Shenandoah National Park Region - Csmres Jmu ...

A.
C.
D.
s
lope p o
r file
B
B
scale
E
R I DG OW
F U
R
R
B
A
A
A
E.
UNDISTURBED
BLOCK FIELD
SURFACE
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1
B.
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25
Figure 17 A. Shattered tor (height ~10 m)
Quartzite blocks break along A) bedding planes
and B) joint planes. B. Quartzite columns
displaced by cambering and toppling. The tilt of
the lines demonstrates the toppling of the nearly
horizontal beds after cambering has opened
and separated the blocks along joint planes. C.
Prominent block slopes west of Blackrock
summit. D. "Curious" ridge and furrow feature at
the toe of the block slope shown in C. Note the
geologists for scale. Landform may be a
protalus rampart. E. Excavation pit of boulder
front individual numbered boulders are identified
in Figure 18. The line marks the upper
boundary of the excavation.
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7
4
5
PIT
FACE
6
BASE
OF
PIT