Ichnofossils, AKA trace fossils, in the sidewalk on the summit of Lava Butte. Of course, since the concrete is a man-made material, it's a pseudorock, and these are pseudofossils. Whatever. These are likely impressions left by a golden-mantled ground squirrel, which are very abundant and common in central Oregon, especially in relatively wild areas with a heavy human presence. They are very clever beggars, and can be quite bold about approaching people for handouts. They're tough to resist, but we don't help them by feeding them.
Photo unmodified. August 21, 2011.
FlashEarth Location.
You might be interested in this shot of a canine (domestic? coyote?) in adobe brick flooring at Mission San Juan Bautista; http://www.flickr.com/photos/ambitious_wench/370539954/
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