A fold is a bend in a rock which tends to show up
best in layered rocks, although they do occur in unlayered rocks
such as granite. These folds can arch upwards, downwards, or
sideways but the effect is always to shorten the crustal rocks.
Folds are usually caused by compressional forces.
When rocks deform by plastic deformation they can bend and fold.
The process of folding occurs when rock is
compressed, as it is along colliding plate boundaries. Upturned
folds are called anticlines and down turned folds are
called synclines. Anticlines and synclines are
geologic structures, that is, they are folds in rock material. They
give expression to the surface as linear ridges (anticlines) and
troughs (synclines). The sides of the fold are called the
limbs. Each fold has an axial plane, an
imaginary plane that runs down its length and divides the fold in
half.
EARTHCACHE REQUIREMENT:
Picture requirement:
My intentions are to have you post your picture with the earthcache
feature the background. If you refuse to post your face in the
picture, then each log must have a unique picture for each log.
Tilting the picture with a photo program will not be acceptable for
unique. Group photos must reference who's picture you are in
otherwise. A unique picture must be included with every log if you
are not in the picture. .
1. Count the number of syncline folds seen at the
coordinates.
2. How many major layers do you see in the folds. (See picture
below)
3. Is the rock in this formation igneous, sedimentary or
metamorphic?
Email the answers, and upload photo with your log. These
requirements must be met to log this cache. Do not post answers in
your log.
Example of counting the layers that you will be looking
for.
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UPDATE: August 24, 2009 - Raised the terrain level just a
bit for the summer. You may have to bushwack due to growth to see
the aspects of the earthcache. It's only a few feet and if you
search a bit, you may find an easier way in. It does get thick. If
you find rock folds interesting, it will be worth the trouble. If
you think it is just another rock earthcache, then come back when
the foliage dies down. This earthcache is best viewed in the winter
months, but still doable in the summer time.