Toltec human sacrifice altar found in Mexico – The History Blog
https://www.thehistoryblog.com/archives/75698

"The momoztli (altar) measures about one meter (3.3 feet) square and was built out of different stones, including volcanic blocks and river stone. It consists of three sections: a base of andesite quarry stone with small blocks no more than four inches thick on the outer face, a second section of larger slabs of andesite and a top section composed of river stones and basalt."

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