In the
Lunar geologic timescale, the
Late Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago. It was the
epoch during which the
mantle below the lunar basins partially melted and filled them with
basalt. The melting is thought to have occurred because the impacts of the
Early Imbrian thinned the overlying rock - either causing the mantle to rise because of the reduced pressure on it, bringing molten material closer to the surface; or the top melting as heat flowed upwards through the mantle because of reduced overlying thermal insulation. The majority of lunar samples returned to earth for study come from this epoch.