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It's a conglomerate, many refer to this type of conglomerate as "puddingstone".

https://www.bing.com/search?pc=CBHS&ptag=N3132D041519A9DFA1A1FF2&form=CONBDF&conlogo=CT3210127&q=pudding+stone

Other members will have to comment as too the makeup of this conglomerate, if you post the general location of where it was found would help determine that makeup.

 

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I suspected a conglomerate but did it expect the concretions that hold the pebbles together to be black.

Where was this ounce?  Looked like a photo I saw from the upper peninsula in Michigan.

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5 hours ago, BobAK said:

looks to be gabbro with white feldspar and may be magnetic if 

magnetite in the black

I agree.

I don't think it is sedimentary because of how the rock is weathering around the inclusions. And the matrix is too dark and igneous looking.

I think it is an igneous rock with feldspar inclusions. 

A close look at that matrix would be the only way to tell. If I had to bet a dollar based on the photo I would say it is a volcanic with feldspar inclusions 

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