pseudomonas.livejournal.com ([identity profile] pseudomonas.livejournal.com) wrote in [personal profile] ewx 2012-12-22 06:14 pm (UTC)

I'm thinking sandstone (or possibly some other sedimentary rock like mudstone). I can't work out if the horizontal lines are layers as in sandstones or streaks as in cement applied with a trowel.
(6 comments)

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