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Geology/Can you identify?

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Question
MYSTERY ROCK 1
MYSTERY ROCK 1  

MYSTERY ROCK 2
MYSTERY ROCK 2  
I have rock that neither the Univ of MN, the MN Geological Society nor the MN Science Museum could identify. I was wondering if you could. It would be greatly appreciated. The attached pictures are of a small slice of a 50 pound boulder and the 16" boulder.  Thanks again.

Answer
Hi Richard,
Interesting specimens.  You don't mention where you got these from so I can't be sure of an I.D. but I think the 16" boulder appears to have unconnected holes and longitudinal depressions that look like they might be cells in organic material.  I think this specimen might be petrified palm wood.  Here's a couple examples that I found that look much like what you have.

This page shows a polished sphere of palm wood. Looks much like yours with the unconnected holes and breached tubes.
http://www.albertjoseph.com/veneratedlapdog/petrified-wood/

This one shows rough specimens with the same breached tubes and circles that might be the ends of the tubes.
http://www.thefossilforum.com/index.php?/topic/25183-lake-livingston-petrified-p

I don't know what the slab is part of.  The round structures remind me of the ends of burrows but I can't tell for sure.  Good luck in identifying it.  You might want to locate a rock club in your area.  I have found that their members can be very knowledgeable concerning rocks and minerals in their area.  Supposing, that is, that these rocks were found in your area.  Here's a site that lists the rock clubs all over the U.S.
http://www.rockhounds.com/rockshop/clublist.shtml


Hope this helped.
Bob  

Geology

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C. Robert Reszka, Jr.

Expertise

I can answer any general geology question (rocks, minerals, stratigraphy, geomorphology etc.). My expertise is in the geology of the Michigan Basin, PreCambrian, Paleozoic and Recent. I can answer questions concerning mining and petroleum exploration and production and the laws concerning those activities. I can also answer questions concerning stratigraphy of the Michigan Basin. I will also answer questions about mineral and rock collecting in the Basin. I won`t be able to answer many specific questions on hydrology, geophysics or geochemistry. I may be able to answer very general questions in those venues.

Experience

I have been working for the State of Michigan for 36 years as a Geologist and a Resource Analyst. I have experience with Subsurface Geology and Petroleum Geology, mining in Michigan, and Sand Dune Mining and Protection issues.

Organizations
Michigan Basin Geological Society

Publications
Decade of North American Geology.
Bedrock Geology of Michigan

Education/Credentials
BS Wayne State University

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