RVET - "Ephemeral Rock" EarthCache
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Difficulty:
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Terrain:
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Size: 
(other)
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RVET (RockVille Earth Trail)
As an earthcache, there is no “box” or “container” to discover. The Rockville Regional park is located in
the City of Fairfield. There is a main entrance and free parking,but there is an Entrance fee of $3.00
dollars. This is a very popular hiking & biking park. There is also additional fee information at the pay station. The park is Dog friendly but will require an additional fee for your 4 legged friend.
Parking Coordinates = N38° 14.903 W122° 07.952
Logging Requirements:
What material is being eroded by the path the water is taking? tuff, basalt, or andesite?
Based on the time of year, is there water running or do you see any moisture on the rocky material?
If so, estimate how much is flowing in Gals Per Minute?
What type of trees are predominate in the location of the ephemeral spring?
Please take your your Picture next to the near by trail marker away from the geological feature.
Please do not post your answers in your logs. Please send your answers to the earthcache owner via geocaching.com with the title of the Earthcache and GC number. If you log the cache without sending the completed logging requirement, you will be contacted to do so, and if not sent within a reasonable amount of time 1-2 weeks, you logs will be subject to deletion.
Geology:
What is an ephemeral stream geological feature?
Ephemeral water-body, is a wetland, spring, stream, river, pond or lake, that only exists for a short
period following precipitation or snow melt. They are not the same as intermittent or seasonal water-bodies, which exist for longer periods, but not all year round. Some ephemeral sources have varying
degrees of vegetation and some areas such as this one can be sparse due to the arrid nature of the area
in the dry months.
Local Information and History:
In this location, which has varying terrain with a mild slope, generate run off from the hillsides and
funnel through this area during the wet season, which are the winter and springs months of the year.
The Rockville park is underlain with volcanic material and most of the exposed bedrock you see consists
of the Pliocene Sonoma Volcanics which is made up of tuff, basalt and andesite. These volcanic rocks
overlie sandstone, tuffaceous sandstone, and volcanic conglomerate of the Pliocene age. The material the water passes over erodes very easily which can be seen by the water wearing a “path” through it as the water travels down stream.
Sources:
www.Wikipedea.org
ga.water.usgs.gov
www.ci.fairfiled.ca.us
BERKLAND, James O.
Geology.about.com
Local Park Rangers Teri and Cheryl
Geocacher Pathfindermark
Permission Given by:
Ranger Teri Luchini and Ranger Cheryl Meyers
City of Fairfield
Public works
420 Gregory St
Farifield, Ca 94533
Additional Hints
(No hints available.)