Braithwaite Wifes Hole EarthCache
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Difficulty:
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Terrain:
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Size: 
(large)
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Now onto the
Geology .
The Yorkshire Dales has a geology of mostly Carboniferous
limestone.
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Limestone is a sedimentary rock which is formed from the remains of
thousands of dead marine animals.
The bones of the animals are crushed by sediments at the bottom of
a tropical sea. The heat and pressure causes them to become
limestone which is primarily calcium carbonate. Carboniferous
limestone is limestone which was formed in the Carboniferous era
which was 390 million years ago.
The Yorkshire Dales is an example of a glaciated landscape. It has
U shaped valleys, aretes, corries and kettle holes. The large
kettle hole near the GZ was formed when the Ice Age glaciers
retreated and left a large chunk of ice in a patch of softer
incoherent rock. The ice sunk and then melted away leaving water.
The water eroded the kettle hole even more and eventually seeped
through the bedding planes of the limestone to form caves and other
features elsewhere.
In order to claim this earthcache, please do the following
tasks.
1) Take a picture of you or your GPS at the site.
2) Climb to the bottom of the kettle hole and tell me its depth.
You can do this by marking a waypoint above the kettle hole, then
taking one inside and finding the difference.
3) Estimate its width.
Please include photographs in your logs and email your answers to
the questions to my email which can be accessed through my profile.
Additional Hints
(No hints available.)