Pollen...
https://www.bing.com/search?q=archeologists+use+pollen&form=EDGEAR&qs=PF&cvid=9b54b5dd728248e88f4c7764b2469429&pq=archeologists+use+pollen&cc=US&setlang=en-US
Yes, as with the Shroud of Turin. I am aware about pollen. Just perhaps, you missed the /s tag?