"Capitalsaurus" is the informal genus name given to a tailbone belonging to a large theropod dinosaur that lived during the Early Cretaceous. It was discovered on January 28, 1898, by construction workers excavating a sewer at the intersection of First and F Streets SE. The only known specimen, it was assigned two different species designations – Creosaurus potens and Dryptosaurus potens – and eventually overturned each time. In the 1990s, the paleontologist Peter Kranz asserted that it represented a unique type of dinosaur and assigned it the name "Capitalsaurus". He successfully campaigned through local schools to make "Capitalsaurus" the official dinosaur of Washington, D.C., which became law in 1998.^[4][5] A year later, the district further recognized F Street at the discovery site as Capitalsaurus Court. It designated January 28, 2001, as Capitalsaurus Day.^[4][6]