coprolite

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Fossilized excrement.

Century Dictionary and Cyclopedia

1. n. A hard roudish stony mass, consisting of the petrified fecal matter of animals, chiefly of extinct reptiles or sauroid fishes. In variety of size and external form the coprolites resemble oblong pebbles or kidney potatoes. They for the most part range from 2 to 4 inches in length, and from 1 to 2 inches in diameter; but some few are much larger, as those of the Ichthyosauri, within whose ribs masses have been found in situ. They are found chiefly in the Lias and the coal-measures. They contain in many cases undigested portions of the prey of the animals which have voided them, as fragments of scales, shells, etc. Coprolites thus indicate the nature of the food, and to some extent the intestinal structure, of the animal which voided them. They are found in such quantities in some localities, as parts of South Carolina, that the mining of the phosphatic rock formed by them for manure constitutes an important industry.
2. n. Any rounded concretionary mass or pebble containing largely calcium phosphate and representing the more or less altered debris of fossil bones, teeth, etc., used as a source of phosphoric acid in the manufacture of fertilizers.

Wiktionary

1. n. A fossil consisting of petrified dung.

GNU Webster's 1913

1. n. (Paleon.) A piece of petrified dung; a fossil excrement.

WordNet 3.0

1. n. fossil excrement; petrified dung