Among the many fossilized stars is a 26-meter-long Mamenchisaurus jingyanensis, a gigantic herbivore that lived around 150 million years ago and had one of the longest necks of its species. It is ...
U.S. Geological Survey The intricate fossils of these tiny ... are typically around 300 million years old. The Smithsonian’s National Museum of Natural History has the T. beardi holotype ...
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