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Other isotope combinations used in dating include samarium-neodymium, rubidium-strontium and uranium-lead.
Where isotope analysis is not suitable, scientists can also use optically stimulated luminescence dating.
Any formations and fossils found within the middle layer are then, in theory, is younger than the layer below and older than the layer above.
Biostratigraphy takes this one step further, analysing the fossils found within each layer.
Bone tools were used during this period as well but are rarely preserved in the archaeological record.