“…As such, biologically available 87 Sr/ 86 Sr, which is soluble and is taken up by biotic agents, can substantially differ in its values between the lithosphere and the biosphere [ 12 , 15 , 63 , 64 ]. As a result, direct bedrock 87 Sr/ 86 Sr measurements typically conducted for geological dating studies [ 65 – 70 ] are not necessarily accurate for applications in archaeological science. Besides Sr deriving from the weathering of local bedrock, atmospheric and surface sources, such as rainfall, rivers, sea-spray, and wind-dust, also contribute to the bioavailable Sr in the food chain [ 15 , 59 , 71 – 74 ].…”