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| Quadrilateral wonderland at Mesa Verde's Cliff Palace |
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| Kiva -- circular and hexagonal roof |
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| Matt at Four Corners -- without him it makes a nice coordinate plane |
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| Mom at Four Corners -- I'm still figuring out how to add things to this blog. The original picture is vertical! |
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| Newspaper Rock Petroglyphs at Petrified Forest National Park. Ann Raab, this made me think of you! |
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| Up close and personal with a petrified tree. Want to learn some chemistry? |
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| Petrified tree with scale |
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