BRP 338.8 Three Knobs Overlook EarthCache

This cache has been archived.

rainbowtree: DO NOT post a log to this cache.
If you choose to disregard CO's request and log this archived cache, be sure you have the following ...
1. Pics at the required coordinates with you or your signature item as verification of visit.
2. All questions completely/thoughtfully answered.
A special thank you to those who completed all the requirements as requested -and- added the Journeys to your log.
Location and content gifted to a special cacher for development of a new EarthCache.

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Hidden : 6/1/2017
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size: other (other)

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Geocache Description:

BLUE RIDGE PARKWAY OVERLOOKS GEOLOGY TOUR
There are countless wonders to behold along your journey.
Posted coordinates are for parking. - Outcrops are within 100 feet.

EARTHCACHE REQUIREMENTS
Each cacher must send his/her own answers BEFORE logging a find. Enjoy the journey (learning adventure) as well as the destination (smiley earned). Remember to take only pictures and leave only footprints. To get credit for this Earthcache, complete the following tasks:

Observe the largest avalanche scar.

1. MESSAGE …. What percentage of the mountain (top to bottom) does the scar cover?

2. MESSAGE …. a. Describe the shape of the scar. ... b. HYPOTHESIS - Explain how you think the shape was formed.

You will need binoculars for this task.
3. MESSAGE …. Using binoculars, do you see evidence of this rock debris at the base of the mountain? Describe.

4. LOG …. Post a picture at or near the coordinates. This picture is your log signature.

OPTIONAL - Please respect the time and effort involved in finding and creating this earthcache by adding A and B to your log.

A. JOURNEY OF THE MIND ... Science explains what we observe. Relate (in your own words) something you found interesting in the reading. This adds to your learning adventure and your log.

B. JOURNEY OF THE HEART ... Art shares our personal experience of what we see. Share something special you found on site, and why it is special to you. This is a memorable addition to your log and will make other hearts smile.

THANK YOU Mark W. Carter for permission to use your book for this earthcache.
THANK YOU Lillian for permission to place this earthcache along the Blue Ridge Parkway.


OVERLOOK

From here you have an outstanding panoramic view of the Black Mountains. These mountains are scarred from recent debris avalanches. In the southern Blue Ridge, torrential rainstorms trigger debris avalanches. As avalanches move downslope, they remove everything in their path down to bedrock and deposit large quantities of debris at the base of the slope.

The largest and most obvious debris avalanche scar visible from this overlook is on the east side of Gibbs Mountain. It occurred in November 1977, covering 98 acres of U.S. Forest Service land with 400,000 tons of debris.

TYPES OF LANDSLIDE MOVEMENT


https://pubs.usgs.gov/fs/2004/3072/fs-2004-3072.html


ROCKFALL

Rocks free fall from a cliff or steep mountainside. The velocities ( 5 km/hour high speed) are fast, but the travel distances are short. Weathering weakens the bedrock along joints until the slightest pressure, often exerted by the expansion of water as it freezes in a crack, is enough to trigger the rockfall.

ROCKSLIDE

Rocks slide down a slope, forming rockslides. The velocities (1 km/hour) are slower because masses of bedrock slide as a unit along joint planes.

ROCK AVALANCHE

Rock avalanches happen when a large volume of stone loosens from a mountainside. They occur on steep, unstable mountainsides. Similar to a snow avalanche, they pick up speed on their downward movement causing destruction in their path.

RESOURCES
A Geologic Adventure Along The Blue Ridge Parkway in North Carolina by Carter/Merschat/Wilson ... 2001
https://www.sciencedaily.com/releases/2008/11/081117082239.htm

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