 The Mare material is thought to be about 5 km deep, giving the Imbrium Basin a total depth of 12 km; it is thought that the original crater left by the Imbrium impact was as much as 100 km deep, but that the floor of the basin bounced back upwards immediately afterwards.Surrounding the Imbrium Basin is a region blanketed by ejecta from the impact, extending roughly 800 km outward.Also encircling the basin is a pattern of radial grooves called the "Imbrium Sculpture", which have been interpreted as furrows cut in the Moon's surface by large projectiles blasted out of the basin at low angles, causing them to skim across the lunar surface ploughing out these features.