Here are the mysteries, and some of the solutions that have been proposed: 1 Though now more than two miles above sea level, the area around Lake Titicaca is littered with millions upon millions of fossilized sea shells. This suggests that at some stage the whole of the Altiplano was forced upwards from the sea-bed, perhaps as part of the general terrestrial rising that formed South America as a whole. In the process great quantities of ocean water, together with countless myriads of living marine creatures, were scooped up and suspended among the Andean ranges.1 This is thought to have
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