Excavations at a rock shelter have revealed that humans lived in high and remote regions of what is now Spain during the coldest part of the last glacial period, between 21,400 and 15,100 years ago.

High-altitude regions are colder and more challenging than low-lying zones, but even so, the plateau probably “hosted a relatively dense human settlement”, says Manuel Alcaraz-Castaño at the University of Alcalá in Spain.

https://www.newscientist.com/article/2395924-humans-lived-on-spanish-plateau-during-earths-last-cold-snap/

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