 The composition of rocks erupted by Aguilera are similar to these from Lautaro and Viedma, and the linkage of specific ash deposits to Aguilera is based mainly on geographical considerations.Other volcanoes have left tephra deposits in the wider region, including Cerro Hudson, Monte Burney and Reclus.A thick tephra from Laguna Potrok Aike may testify to an eruption of Aguilera between 42,400 - 51,747 years before present.