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Liesegang Bands at the Dells

A cache by peach107 Send Message to Owner Message this owner
Hidden : 12/16/2013
2 out of 5
1.5 out of 5

Size: Size: other (other)

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Geocache Description:

Bands in Sandstone

1. Are joints or cracks visible within the granite?
2. Describe the bands. Are they random, repeating, concentric, jagged, uneven.....?
3. How wide are the bands at their widest point?
4. What color are the bands?
5. What pattern do these bands form? Square, circle, rectangle, triangle....?
6. Look very closely (and I mean closely) at the bands. What do you see in the middle of the bands? You might have to look at several bands to see the answer that I'm looking for.

Granite Weathering:
The rounded erosional pattern of the granite bedrock outcrops is called spheroidal weathering, and is typical of granites around the world. The granite has been jointed or cracked in a rectilinear pattern and forms blocks. Water seeps into the rocks along the cracks and breaks down the minerals within the granite itself. The corners of these blocks are more susceptible to weathering and erosion as water attacks them from 3 sides at once. As the corners are eroded away, the remaining granite develops a characteristic rounded stacked boulder landscape like you see here.

At the coordinates you will see stains on the rounded granite rocks. These stains are called Liesegang bands (LEEZ-gahng) or Liesegang rings. They are patterns of iron-oxide, ranging from a reddish-brown to a yellowish brown in color. It is thought that these bands show where groundwater has oxidized the iron content of the biotite and hornblende minerals contained within the granite. The actual cause of which Liesegang rings form is not entirely understood and is still being researched at this time.

Email your answers to the questions, to me, using the link in my profile only. If your answers are not received by me, your log will be deleted. Photos are accepted and appreciated as long as the answers are not pictured. You do not have to wait for confirmation from me before logging this cache as completed.
Most of all……learn……and enjoy the view.

EarthCache approved by
Joe Baynes City of Prescott
Parks & Recreation Director
928-777-1599 Office
928-771-5845 Fax

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67 Logged Visits

Found it 62     Write note 4     Publish Listing 1     

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Coordinates are in the WGS84 datum

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