[Fred Nerks]

Determining the age of fossils found in conditions like those at Sima de los Huesos is notoriously difficult. At Gran Dolina, clues from the distinct archaeological layers helped pinpoint the age of the fossils found there. But the Pit of the Bones is filled with muddy sediments with no distinct geologic layers that can be easily dated.

I take it they really don't know...(anything.)

[SunkenCiv]

Must be the “cave” remained exposed to the great outdoors and ran downhill, analogous to KV5 in Egypt’s V of the Kings.