Simpson Springs Tuff EarthCache
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Visit the location and answer the questions. If you do not send an email soon after your logging your log will be deleted. So do not forget
Examine the rock at this location and answer the following questions.
1- What would you say is unique about this outcrop. (not location or shape)
2-Is the makeup of the tuff (not the fragments in the tuff) uniform in color and shape?
There are larger fragments of stone in the outcrop. Review them to help answer the next questions.
3-Are the other materials in the tuff uniform in size?
4-Are they the same type of rock? explain what you see
5-Using the list below, what kind of tuff would you guess this is? and why?
6-Include a photo of you, or a personal item with the building behind you?
Tuff is a catch all for many different kinds of volcanic rock. Rock that is made from the ash and pyroclastic flows from a volcanoe.
Here are some of the options of the kind of Tuff that there is.
Volcanic Ash Tuff Just tiny particles of ash that form thick layers that are compressed to form a stone. The particles are less that 2mm in diameter
Breccas Tuff Where many tuffs are made up of just the ash. This is one that has many particles of other stones. They are not always the same diameter, size, and may not even be volcanic. A volcanic explosion blowing a large amount of other material into the ash.
Crystal Tuffs Sometimes the extreme heat will cause tuff and other material to melt and form crystals.
Welded Tuff Sometimes the volcanic stones are all based on a large pyroclastic explosion. Large amounts of stone are ejected and not ash. That stone fuses together when it falls as it is still very hot. Fusing it together.
There are many other kinds as well, that are made up of various minerals and other materials. Some are common and give it color red, brown, orange or rarely a green color.
In this place you see an outcrop that was used as part of one of the bases of an old building on the pony express trail.
Additional Hints
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