ornithichnite

from The Century Dictionary.

• noun In geology, one of the footmarks, at first supposed to be those of gigantic birds, or of bird-like reptiles (ornithosaurs), occurring abundantly in the Triassic sandstone of Connecticut and elsewhere. They are now believed to have been made by dinosaurian reptiles.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Paleon.) The footmark of a bird occurring in strata of stone.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun paleontology The footmark of a bird occurring in strata of stone.