At the time, Saudi Arabia was a grassy plain with many lakes:
Archaeologist Patrick Roberts of the Max Planck Institute for the Science of Human History and his colleagues recently discovered a handful of stone tools in a sandy layer of soil beneath the dry traces of a shallow Pleistocene lake at Ti’s al Ghadah, in the Nefud Desert of northern Saudi Arabia. The soil layer dated to between 300,000 and 500,000 years ago, and it also contained fossilized remains of grazing animals, water birds, and predators like hyena and jaguar. Many of the bones seem to bear the marks of butchering by tool-wielding hominins. Kiona N. Smith, “Archaeologists find 300, 000-year-old stone tools in Saudi Arabia” at Ars Technica
On account of finds like this, some think that humans also lived in North America 100kya. The evidence may be ambiguous but the idea is not simply impossible.
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See also: New find extends back our knowledge of earliest identified North Americans Science News: Early American settlers crafted stemmed spearpoints and probably traveled down the Pacific coast starting around 16,000 years ago, the researchers contend.
First North Americans might have been Neanderthals, 130 kya…
Were there humans in North America 100 thousand years ago?