Plus anciennes traces fossiles de plumes de dino

 

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One of the earliest discoveries of possible feather impressions by non-avian dinosaurs is an ichnofossil (Fulicopus lyellii) of the 195-199 million year old Portland Formation in the northeastern United States. Gierlinski (1996, 1997, 1998) and Kundrát (2004) have interpreted traces between two footprints in this fossil as feather impressions from the belly of a squatting dilophosaurid. Although some reviewers have raised questions about the naming and interpretation of this fossil, if correct, this early Jurassic fossil is the oldest known evidence of feathers, almost 30 million years older than the next-oldest-known evidence.

Photo: Cast in Japan of a resting trace from Massachusetts, which was argued to have been made by a theropod like Dilophosaurus and to include feather impressions around the belly (arrow), but this has been questioned.