Radiocarbon dating shows that the younger layers L1 and L2 are related to the Tauca lacustrine phase (12 000–16 000 cal yr C and U/Th data obtained on lakes Tauca and Minchin from various authors suggests that the duration of the lacustrine events increased regularly during the Pleistocene.In contrast, paleolake levels in the northern Altiplano decreased from the oldest known (Lake Mataro, 3950 m) to the present Titicaca level (3806 m).Lake Ballivián itself is of late Quaternary age and may have influenced the spread and development of animals in the Altiplano.In the southern Altiplano, Lake Escara may be coeval with Lake Ballivián.Among the five paleolakes of the northern Altiplano (Titicaca basin) and the three of the central Altiplano (Poopó, Coipasa and Uyuni basins) only the two most recent paleolakes have been dated.A 121 m long sediment core recovered from the Salar de Uyuni contained 11 lacustrine layers (L1–L11) separated by 12 salt crusts.We synthesize the results of the most recent published glacial geologic studies from 12 mountain ranges or regions within Peru and Bolivia where glacial moraines and drift are dated with terrestrial cosmogenic nuclides (TCN), as well as maximum and minimum limiting ages based on radiocarbon in proximal sediments. Special consideration is given to document paleoglacier valley localities with topographic information given the strong vertical mass balance sensitivity of tropical glaciers.
Atlantis is presumed to have existed in one of the wet periods when its canals were fed by the overflowing waters of Lake Titicaca.
The deposits of the extensive paleolakes of the Bolivian Altiplano correspond to an alternation of lacustrine episodes and dry periods, a phenomenon commonly explained by climatic changes.
The lack of precise dating of the deposits has prevented detailed reconstruction of the evolution of paleolakes that would allow a determination of the relative influence of interconnections between neighboring basins and local climatic conditions.
In order for the circular rings of water to function as harbours with access to the lake, the lake must have been considerably higher and a higher level would also be necessary to feed the perimeter canal and irrigation system which was said to have run around the adjacent level rectangular plain.
view of the outer ring at Pampa Aullagas, the upper part is covered in volcanic boulders originally created by flowing lava while the bare sand on the slopes beneath the boulders suggests the plain has dropped in elevation away from the original volcanic mountain.