Skip to content

<

Pisgah Lava Tubes

A cache by AWEMM Send Message to Owner Message this owner
Hidden : 03/01/2010
Difficulty:
2 out of 5
Terrain:
3.5 out of 5

Size: Size:   not chosen (not chosen)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:

Pisgah Volcano is the youngest vent in the Lavic Lake volcanic field. The surrounding exposed rock features are the result of volcanic activity dating back 20,000 to 50,000 years, and possibly as recent as 2,000 years ago. The Pisgah Lava Tubes are constructed of Pahoehoe flows – basaltic lava with a smooth, billowy, undulating, or ropy surface.

Warning: There are inherit dangers when exploring lava tubes including cave-ins, rock falls, and razor-sharp rocks. Before entering the lava fields, we highly-recommend long pants, closed-toe shoes, gloves, and hard-hat. Beware of your surroundings and the location of each member in your party.

Lava tubes are constructed when the surface of a low-viscosity lava flow cools forming a hard and continuous crust. This crust thickens forming a solid roof which insulates the still-flowing molten lava stream. When the eruption ends, the lava stream continues to flow out the end of the tube leaving an empty void under this solid basaltic rock surface.

Location AN34 44.919, W116 22.304 – places you on the West-ridge of a collapsed formation. Inspect the large trench before you both up-slope and down-slope.

Location BN34 44.940, W116 22.295 – places you at several lava tube openings. Compare the floor surface with the wall and roof.

Logging requirements:
Send us a note with:

1. The text "GC24KBM Pisgah Lava Tubes" on the first line.
2. Post the number of people in your group with a group picture at Location B.
3. At Location A, what is the estimated width of this collapsed formation?
4. What is the difference in elevation between Location A and lava tube opening at Location B?
5. Is this collapsed formation one large lava tube or a series of lava tubes? Why?


The above information was compiled from the following sources:

  • Lavic Lake, Global Volcanism Program, http://www.volcano.si.edu/world/volcano.cfm?vnum=1203-19-
  • USGS definition of Pahoehoe, http://volcanoes.usgs.gov/images/pglossary/pahoehoe.php
  • USGS definition of Lava Tube, http://volcanoes.usgs.gov/images/pglossary/LavaTube.php

Additional Hints (No hints available.)



Reviewer notes

Use this space to describe your geocache location, container, and how it's hidden to your reviewer. If you've made changes, tell the reviewer what changes you made. The more they know, the easier it is for them to publish your geocache. This note will not be visible to the public when your geocache is published.