SJ Brock

Here is different pic. of larger piece after simply washing.  Finger shown for scale.  Very fragile, as you can see pieces in lower part of picture are fragments of where i am pointing (fragments approx. 6-8 in in length).   Soaking in bleach, will also get a mason blade.

Thanks again!

Thank you, great recommendation - I'm on it! 

These two pieces were found in Eastern Nebraska.  I believe this to be petrified wood.  Any feedback would be appreciated.  Thank you!