 Both tribes were derived from the Italic people who were called by the Romans the Volsci; hence, the Monti Lepini, the Monti Ausoni and the Monti Aurunci are also called the Volsci or Volscian Chain.Coincidentally they are all of the same karst topography and have the same orogeny, which is not quite the same as the Apennines proper.The Monti Aurunci mainly consist of friable limestone, which becomes harder toward Gaeta.