A 54-km- (33.5-mile) diameter Noachian-aged crater with neither inlet nor outlet channels is distinct from previously documented crater basin lakes on the planet, according to new research from Brown University. Visible images with sketch maps showing major geologic features within as-yet unnamed crater mapped by Boatwright & Head: (a) the 54-km-diameter crater in the southern highlands of Mars (20.3°S, 42.6°E); no inlet or outlet breaches are...