“Capitalsaurus” fossils were discovered in January of 1898 at the intersection of First and F Streets S.E., in the District of Columbia - an intersection now designated as Capitalsaurus Court. These fossils were not uncovered by any paleontological activity, but as a by-product of sewer work.
The “Capitalsaurus” is the official dinosaur of the District of Columbia.
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Wikipedia, State dinosaurs
(for more information, consult the Official Dinosaur Act of 1998, Bill 12-538)