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In response to "Interesting. There's another one that basically looks like naturally-formed chunky concrete. -- (link)" by Beryllium

that's almost exactly what conglomerate is.

it's kind of tough to say exactly what's in the first picture. top left is certainly conglomerate, stuff in the middle looks like a big chunk of sandstone, but it's tough to say whether it's a clast in the conglomerate or a formation of its own.

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