Minterichnus shieldi, a new type of trace fossil (resting trace) of a phyllocarid crustacean from Texas shows animals trapped in a tidal pool, just before animals first emerged onto land. Minterichnus shieldi, a new 500-million-year-old fossil resting trace of a phyllocarid crustacean from Texas, 55 mm long. Trace fossils represent the remains of an ancient organism’s activity. They include animal tracks, burrows and resting traces. A new type of...
