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Double Arch Frame and Foundation

A cache by firennice Send Message to Owner Message this owner
Hidden : 12/21/2014
1.5 out of 5
2.5 out of 5

Size: Size:   other (other)

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Geocache Description:

To log the cache email me the answers to the following questions.  Please send them close together, if you don't your log may be deleted because I cannot match them up. 

  1. Send the Name, or GC code, and the names of people that were with you that you are submitting the answers for. 
  2. If you look at the lower part of the arch and below it (Dewey Bridge Sandstone) and the arches themselves (Entrada Sandstone).  Which one will weather faster?  What differences in the rock types do you see?
  3. Look at the Double Arch to the north, is it a young arch or mature? Do you think that it formed from the top or side? Explain?
  4. East of you is another arch forming.  Is it in the Dewey Bridge or Entrada?  What is the difference from that and the Double Arch.
  5. Post a photo of you at this location without giving away the answers. Instead of you, use your foot, GPS, paper with your caching name. Something to ID that it is you.

At this location you can see the formation of two different kinds of arches. 

Arch Age

One way to look at arches is to determine how old they are.  You can look at a new arch and you can easily tell how an arch was formed.  The blocks that fell out may be sitting there, or you may see the small hole forming the opening in the arch.   Some arches will form as the sides erode and others while the top erodes down. 

Arches that are more mature may be far more difficult to determine how they were formed.  You have to look and think back to how things are formed.   It may be harder to determine if the arch formed from the top or side. 

Arch formation

Arches that are more mature may be far more difficult to determine how they were formed.  You have to look and think back to how things are formed.

Fin erosion.  Many of the arches that erode here are by the vertical fins that erode and the holes form between them

Potholes.  A hole forms from above, and erodes into softer material. 

Water from flowing rivers, ocean tides and waves, are some of the many less likely erosion patterns.

Dewey Bridge and Entrada Sandstone.

The arches that you see here are made up of two different sandstones.

Entrada is the lower sandstone.  The tops of the arches here are made of this type of sandstone while the bases are made of Dewey Bridge Sandstone.  They wear at different rates,  some sandstone is harder or softer.  The right combination is needed to make the an arch.

Additional Hints (No hints available.)

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