What a beautiful discovery!

For context, 50k years ago was the early phase of a North-African pluvial period when the Sahara was a wet and fertile region; this lasted 20k years. The Neanderthals disappeared 40k years ago. The first evidence of the domestication of dogs dates to around 35k years ago in Europe and Siberia.

For the Northern Europeans here, reindeer and caribou are actually the same species, Rangifer tarandus, but with substantial differences: caribou are large, wild, elk-like animals which can be found in northern North America and Greenland and have never been domesticated. In my experience the meat tastes the same.