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*  Campo Laborde: A Late Pleistocene giant ground sloth kill and butchering site in the Pampas | Science Advances
Humate contamination cannot be overcome by using standard bone collagen preparation techniques (e.g., decalcification, alkali ... Decalcification was considered complete when (i) CO2 effervescence had ceased, (ii) the resulting collagen had a translucent ... 35) and Stafford (34) and comprised decalcification in HCl, extraction with KOH, gelatinization and filtering through 0.45-μm ... that advanced radiocarbon dating techniques do not support Holocene survival of megafauna in the area, and that these new dates ...
http://advances.sciencemag.org/content/5/3/eaau4546