Twin Springs' EarthCache EarthCache
Hidden : 4/2/2008
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

This EarthCache is located in Decorah Iowa. Twin Springs serves as the source of Twin Springs Creek, considered one of the premier trout streams in Northeastern Iowa.

Twin Springs was formed by the movement of the Ice Age Glaciers. As the glaciers flowed over the area, it softened and lifted out blocks of rock, which were moved out of the area by the moving ice. (This process is known as plucking). The rate of glacier erosion is variable, and is controlled by several factors. Some of these factors include:

* Velocity of glacial movement.

* Thickness of the ice.

* Shape and hardness of rock fragments contained in the ice at the bottom of the glacier.

* Permeability and water pressure at the glacier base.


As you can see, the glaciers excavated the landscape where the spring is located. The spring was formed because there was a natural flowing body of ground water at or below the local water table where the subsurface material was saturated with water. A spring is formed as a result of an aquifer being filled to the point where the water overflows onto the land surface.



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To receive credit for this EarthCache, you will need to complete the following tasks:

1. Measure the depth of the spring at the retaining wall.

2. Measure the temperature of the spring. (The spring's temperature remains nearly constant year round.)

(e-mail this information to me)

and

3. When logging this EarthCache, please upload a picture of yourself/team with your GPS clearly visible and the spring in the background.

Logs that do not meet these three criteria Will Be Deleted- No Exceptions!

Additional Hints (No hints available.)



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