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Arthur Posnansky enjoys a rather ambiguous status in contemporary Bolivian archaeology.

On the one hand, he is hailed as the father of the South American nation’s archaeological pedagogy.

American Association of Stratigraphic Palynologists Foundation, Dallas Texas, 423 p.

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Palaeoecological Events during the last 15000 years.

Packrat Middens The Last 40,000 years of Biotic Change.

Ever since José de Acosta's prescient speculation, in 1590, that Native Americans were descended from “savage hunters” who had followed game animals across a land bridge from northeastern Asia into northwestern America (Acosta 1604), most serious scholars have assumed that this was the migration route.

The main point of dispute has been the date when the ancestral Asians made the crossing.

Archaeologists use the remains of the past to help solve the puzzles of history.