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Tracks on log

Tracks on log
San Francisco, San Francisco County, California, USA
May 21, 2011
This barkless log, one of several arranged amphitheater-style around a fire pit in Glen Canyon, had several patterns like the two shown. The upper pattern is 9.5 cm wide.


Could also be Phloeosinus. W
Could also be Phloeosinus. With identification of tree species we could make a highly educated guess.

Scolytus spp. have similar patterns, but others might, too
let's wait for the experts

Moved from Unidentified Wood Borings.

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