Paleolake geochronology supports Last Glacial Maximum (LGM) age for human tracks at White Sands, New Mexico.

Abstract

Discovery of human footprints in alluvium dated to the Last Glacial Maximum (LGM) at White Sands, New Mexico, was a notable step in understanding the initial peopling of the Americas, but that work was met with criticism focused on the reliability of the materials used in the radiocarbon dating (seeds of <i>Ruppia</i> and pollen). This paper reports on an independent study of the chronology of a previously unrecognized stratigraphic record of paleolake Otero that is directly traceable into the track-bearing alluvium. The stratigraphic data along with 26 additional radiocarbon dates on palustrine mud determined by two labs independent of the original investigations document an aggrading lake/wetland/stream record that includes the tracks and spans >23.6 thousand years to ~17.0 thousand calibrated years before present, providing another line of evidence further supporting the validity of an LGM age for the tracks.