Geophoto: petrified wood

Segmented petrified log in the Blue Mesa Member, Petrified Forest National Park 2010

What rolls down stairs, alone or in pairs? That’s right kids, it’s Log! This half-meter diameter log was buried some 200 Myr ago and its organic content was replaced by silica (a process called permineralization). One thing I’ve always wondered: If we split wood parallel to the long axis, why is it so common for petrified wood to break along such nice planes perpendicular to the grain (as it is here)?

Enjoy the rest of the great photos that are sure to come on the last day of Geology Photo Week! Visit the Georneys post that started it all, or view my previous photos from this week (click thumbnails to view post + description):

Get your own Blammo! Log here:

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2 thoughts on “Geophoto: petrified wood

  1. Are you trying to tell me that this tree crosscut itself millions of years ago? I find that impossible to believe.

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