Petrified wood or sandstone?

HillBilly244

Sr. Member
May 4, 2013
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Sorry, but you’re still not showing Schreger lines. Schreger lines cross at an angle. They don’t run parallel to the outside curve of the tusk. Mammoth lines cross at about 90° like this pic. African elephant lines cross at 45°.
IMG_4837.jpeg
 

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