"Strontium levels vary across the world, and in some areas, are distinctive to specific smaller regions. Strontium levels vary in nature, and end up in humans who reside in the region.
"The fact that the human has a similar isotopic signature to strontium levels of a geographic location means that person very likely was born or lived in that area for a length of time and was exposed to the strontium there. Strontium adheres to bones and teeth given its likeness to calcium.
"As a result, the bones found at an excavation site may be taken to a laboratory and analyzed for strontium levels. The area this person lived in for a long time may be discernible, although not all of the time. This information may help in identifying someone as a longtime resident (or conversely, as a transient or visitor)."
Read more at: Chemistry in Archaeology: The Importance of Carbon and Strontium to Archaeologists http://archaeology.suite101.com/article.cfm/chemistry_in_archaeology#ixzz0i1KmNxVC
not only do I drink sea water...I’m made of it!
My strontium levels are known far and wide.