In 1970, the Dutch Foundation for the Advancement of Tropical Research (NWO-WOTRO) discovered four new preceramic sites and the analysis of lacustrine sediments allowed a more accurate understanding of the paleoclimate and flora.

About 12,500 years ago, a gradual rise of temperature allowed the return of Andean cloud forest and the settlement of many animal species, making hunting easier.

The excavations of this period, near Tocancipá at Tibitó, dated at 11,400 years BP, show lithic instruments, bone tools and remains of Pleistocene megafauna, such as mastodons (Haplomastodon waringi and Cuvieronius hyodon), American horse (Equus amerhipuus lasallei), and deer (Odocoileus virginianus) with traces of ritual ceremonies.

From this period the archaeological site of Tequendama in Soacha shows lithic instruments (Tequendamenses tools) with a more smooth manufacture, many of them made with materials brought to this place from the Magdalena River valley, such as quartzite.

The El Abra caves were abandoned gradually, while other nearby rock shelters like Nemocón and open area settlements as Checua were populated.