Four exceptional fossils represent newly described species.
Just beneath the scrubby plains of southern North Dakota at the site of an ancient riverbed, paleontologists are hard at work digging up the end of the world as the dinosaurs knew it.
The team found the fossils at a site called"Tanis," named after the purported last resting place of the Ark of the Covenant in the 1981 movie"Raiders of the Lost Ark." Tanis is a section of the famous Hell Creek Formation, which spans parts of Montana, South Dakota, North Dakota and Wyoming, and it was once home to a large, deep river that fed the now-dry Western Interior Seaway that stretched from the Gulf of Mexico to the Arctic Ocean.
The researchers dubbed one of the newfound species Acipenser praeparatorum ; they named the other species Acipenser amnisinferos, or the"sturgeon from Hell's Creek.") Both fish species are extinct today. However, they bear an unexpected resemblance to modern-day sturgeon that are native to East Asia and Europe, rather than North America, study co-author Eric Hilton, an evolutionary biologist at the Virginia Institute of Marine Science, told Live Science.
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