In all our walking around and looking at the ground (and walls) as scientists and engineers do, the question of what the heck we're looking at has come into play. Here are a few of the choices (actual stone paths TBD):
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| Granite from Yosemite (pic credit) which is a felsic igneous rock containing a high silica content, greater than 63% SiO2 (examples granite and rhyolite) |
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| Close-up of gabbro specimen; Rock Creek Canyon, eastern Sierra Nevada, California. (Granite) (photo credit) |
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| Basalt (photo credit) |
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| Tuff (photo credit) |
Here are some resources for rock identification (From Laboratory Manual in Physical Geology)
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