Here is a location that demonstrates the violent uprising of the Sierra Nevada Mountains.
All along this section of the 108 corridor one can see two prominent geological formations, the first are occasional buttes (see GC2HJPM) and the second are strange rocks jutting from the ground at weird angles. This second formation is what this earthcache is about.
The Sierra Nevada Mountains of California formed about 80 million years ago when volcanic action started to push up a new range of mountains, many of these ancient peaks can still be seen around the area as well. At these locations we can see some of the remnants of this action. Most of the rocks in the area are volcanic in nature and came from one of the volcanoes further up in the foothills exploded. It must have been a rather violent eruption to have spewn rocks this far. So all this means that these rocks are basically hardened lava. When rocks are throw violently they usually have very little shine to them because the volcanoes that erupt like this usually don't have a large amount of silica in them. To get credit for this earthcache you must note some observations about these rocks and how they hint at how our mountains were formed.
Email me the answers to the following questions:
1. The GC code and name of this cache.
2. The number of people in your group.
3. Based on the angles that the rocks are sticking up out of the ground at, in what general direction did they come from?
4. Are the rocks shiny, suggesting that they came from lava with a high amount of silica?
5. Based on your answers to question 2, does this support the fact that they were spewn violently?
6. Granite forms when rock cools slowly, giving it a little lighter color than some other igneous rocks, does the color of them suggest that these rocks are granite or not?