Skandinaviskt Arkeologiforum

Evidence of humans in North America during the Last Glacial Maximum

Despite a plethora of archaeological research over the past century, the timing of human migration into the Americas is still far from resolved. In a study of exposed outcrops of Lake Otero in White Sands National Park in New Mexico, Bennett et al. reveal numerous human footprints dating to about 23,000 to 21,000 years ago. These finds indicate the presence of humans in North America for approximately two millennia during the Last Glacial Maximum south of the migratory barrier created by the ice sheets to the north. This timing coincided with a Northern Hemispheric abrupt warming event, Dansgaard-Oeschger event 2, which drew down lake levels and allowed humans and megafauna to walk on newly exposed surfaces, creating tracks that became preserved in the geologic record. —AMS

Jerrark skrev: ↑

23 oktober 2021, 17:02

Bevarade fotspår i White Sands National park i New Mexico, USA, tyder på mänsklig närvaro i Amerika redan för 23000 år sedan. Fotspåren är bevarade i gipsrika sediment vid en forntida sjöstrand.

Förutom mänskliga fotspår har man även hittat fotspår av mammutar, urtida jättevargar (Canis dirus), jättetrögdjur och fåglar. Väldigt fantasieggande och fascinerande.

Evidence of humans in North America during the Last Glacial Maximum

Despite a plethora of archaeological research over the past century, the timing of human migration into the Americas is still far from resolved. In a study of exposed outcrops of Lake Otero in White Sands National Park in New Mexico, Bennett et al. reveal numerous human footprints dating to about 23,000 to 21,000 years ago. These finds indicate the presence of humans in North America for approximately two millennia during the Last Glacial Maximum south of the migratory barrier created by the ice sheets to the north. This timing coincided with a Northern Hemispheric abrupt warming event, Dansgaard-Oeschger event 2, which drew down lake levels and allowed humans and megafauna to walk on newly exposed surfaces, creating tracks that became preserved in the geologic record. —AMS

https://www.science.org/doi/10.1126/science.abg7586

Earliest evidence of human activity found in the Americas
https://www.bournemouth.ac.uk/news/2021 ... d-americas

Stunning footprints push back human arrival in Americas by thousands of years
https://www.nationalgeographic.com/hist ... d-americas

Abstract
Human footprints at White Sands National Park, New Mexico, USA, reportedly date to between ~23,000 and 21,000 years ago according to radiocarbon dating of seeds from the aquatic plant Ruppia cirrhosa. These ages remain controversial because of potential old carbon reservoir effects that could compromise their accuracy. We present new calibrated 14C ages of terrestrial pollen collected from the same stratigraphic horizons as those of the Ruppia seeds, along with optically stimulated luminescence ages of sediments from within the human footprint–bearing sequence, to evaluate the veracity of the seed ages. The results show that the chronologic framework originally established for the White Sands footprints is robust and reaffirm that humans were present in North America during the Last Glacial Maximum.