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geology-Signs of Crustal Deformation

Question # 00109570
Subject: Geology
Topic: General Geology
Due on: 10/28/2015
Posted On: 09/28/2015 09:33 AM

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Folds in Layered Rocks: Signs of Crustal Deformation
The deformation of
horizontal
sedimentary beds
at the onset of
collision to produce
folds in the crust is
the trademark of
the mountain
building process.
The geometry and
overprinting of
successive
generations of folds
in the crust help to
unravel the nature
of the collisional
orogen.

Folded Mountain Belts

0

50 km

Landsat satellite imagery
from Australia (upper left
image) shows the typical
expression of eroded
folded mountain ranges
exposing gently-plunging
anticlines and synclines
resulting from horizontal
compression of collision.
Steeply-plunging folds in
the Canadian Shield (lower
left image) where scoured
by glaciers reflect a more
complex folding history
for these ancient
PreCambrian mountain
ranges long since removed
by erosion.

0

50 km

0

Folded Mountain Belts

100 km

Mapping of sedimentary beds
in the Valley and Ridge
province of the Appalachian
Mountains delineated beds of
differing ages often repeated
by folding.
Geologic mapping has been
greatly facilitated by the
availability of aerial and satellite
photography (lower left).
The sandstone limbs of eroded
anticlines and synclines stand
up as ridges with shales and
limestones in the plunging
cores of the folds more easily
eroded into the low lying valleys
that make up the Valley and
Ridge province.
0

30 km

Folded Mountain Belts

0

50 km

0
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