Quiz #129: Natural Mystery

I don't expect a species level answer for today's up-close quiz. In general, what type of natural surface is shown below? (Photographed in Wells, ME on November 15, 2014.)

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5 thoughts on “Quiz #129: Natural Mystery”

    1. Impressive guesses by all of you! Bravo! However, none are correct. Birch bark is probably the closest guess, as this mystery does rely on the presence of wood.

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