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They are considered trace fossils because they contain no fossil material
The teeth are sharp as in the Eichstatt specimen
The head was small with a beak at the tip of the jaws
classified it as an “indeterminate species of Homo
and was inhabited by a rich fauna of marine life such as this crab
Xiphactinus audax, skull Ankylosaurus They are considered trace fossilsXiphactinus audax (from Latin and Greek for "audacious sword ray") was a large, 15 to 20 foot long predatory bony fish that lived in the Niobraran Sea, in what is now North America, during the Late Cretaceous. When alive, the beast would have resembled a gargantuan, fanged tarpon. Skeletal remains of Xiphactinus have come from Kansas, Alabama, and Georgia. Despite being preyed on by sharks and mosasaurs, X. audax was, nonetheless, a voracious predator
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