Bonhams New York is putting the prehistoric deposit up for sale along with a 30,000-year-old woolly mammoth tusk, expected to sell for up to $50,000.
The auction house predicts the 50,000-year-old skull and jaws of a giant beaver will sell for about $20,000.
The dinosaur dung looks like a rock on the outside and a colorful mineral inside.
It is 130 million years old and is expected to sell for between $350 and $450. It has lost any original odor.
