It's the bottom of a building or a building. Base of a sculpture, a pedestal, statue or a column. Rodapié or lower frieze of a wall. It is another way to call the floor of the seabed, also called Continental Shelf or Underwater Platform. In Geology primary layer (basal) that is, it belongs to the Paleozoic or Primary Era.
Base : 1 : Lower body of a construction, which serves to raise the bases to the same level. -2 : Frieze, sash that is usually painted or put on fabric, mat, paper, reed, etc. at the bottom of a wall. -3 : Lower member of the pedestal, under the nerto . -4 : Species of pedestal . -5 : In Chile, arrocabe .