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EarthCache

Checkerboard Mesa - Zion NP

A cache by TerryDad2
Hidden : 11/2/2006
In Utah, United States
Difficulty:
1 out of 5
Terrain:
2.5 out of 5

Size: Size: not chosen (not chosen)

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Geocache Description:

There is a small parking area at the coordinates. At peak times, this area will be very crowded. If you’re not sure what to look at, find the plaque. Be sure to check the logging requirements.

The main features of the Checkerboard Mesa are the generally perpendicular lines in the cliffs of the mesa. The vertical lines are shallow fractures likely resulting in repeated freezing and thawing of the rock surface. The roughly horizontal lines are the result of different rates of weathering along layers of coarser sand in the wind-blown (eolian) cross-beds of the Navajo Sandstone.

Cross-beds are formed by layers of sand grains as they build up into a dune then collapse. Wind piles sand up the gentle windward side of a dune. When the dune becomes too steep to support itself, it collapses creating the angled layers. This process also slowly inches the dune in the direction of the wind.

Over time, the next dune migrates over the first, burying the first and preserving the crossbeds. The USGS Western Coastal & Marine Geology website has some downloadable movies to demonstrate the process (http://walrus.wr.usgs.gov/seds/bedforms/animation.html).
Image Source USGS: http://www2.nature.nps.gov/geology/usgsnps/dune/dune.html

Logging requirements:
Send me a note with :

  1. The text "GCZ5Z9 Checkerboard Mesa - Zion NP" on the first line
  2. Based on the the crossbeds you can see, which way was the wind generally blowing when they were formed?
  3. Optional--because some are logging this from information from other sources, please post a picture of yourself or another in your group with the Checkerboard in the background.
As a note, this will be an apparent wind direction since the references I have indicate that the wind was generally blowing from the north to the south.

The above information was compiled from the following sources:

  • Miek, Robert F., et. al., Geology of Zion National Park, Utah in Geology of Utah’s Parks and Monuments, 2003 Utah Geological Association Publication 28 (second edition) D.A. Sprinkel, T.C. Chidsey, Jr. and P.B. Anderson, editors
  • USGS: http://www2.nature.nps.gov/geology/usgsnps/dune/dune.html

Placement approved by the
Zion National Park


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Inventory

There are no Trackables in this cache.

 

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1,166 Logged Visits

Found it 1,150     Write note 10     Archive 1     Unarchive 1     Temporarily Disable Listing 1     Enable Listing 1     Publish Listing 1     Update Coordinates 1     

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**Warning! Spoilers may be included in the descriptions or links.

Current Time:
Last Updated: on 11/24/2014 5:43:09 PM (UTC-08:00) Pacific Time (US & Canada) (1:43 AM GMT)
Rendered From:Unknown
Coordinates are in the WGS84 datum