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The Imbrium basin's effects The dark blue area surrounding Imbrium basin on this map shows Don Wilhelms' interpretation of the extent of primary ejecta for the Imbrium basin. The Apollo 16 landing site, marked with a "+", is at the edge of this geologic unit. Apollo 15 site is inside the unit and the Apollo 17 landing site is just outside the boundary. There are some uncertainties in the positions of the boundaries of the units. Courtesy Paul Spudis via PSRD