[1] A tectonic event resulting into a relative uplift of the Eastern Cordillera with respect to the Altiplano may have triggered a lowering of the terrain and facilitated the formation of Mataro and Cabana.
[3] River sediments consisting of 50 metres (160 ft) thick deposits of clay, gravel and sand have been left by Lake Mataro.
[4] Lake Mataro has been identified in the northern Altiplano, where deposits from this stage are found at an altitude of 3,950 metres (12,960 ft).
[5] It formed a single large lake over the central and northern Altiplano.
[4] Progressive erosion of the outlet of Lake Titicaca may be responsible for the observed reduction of the levels of the northern paleolakes during time, as it allowed water from the northern lakes to spill into the southern ones.