KEEN amateur archaeologists have teamed up with English Heritage to solve the riddle of the woods.
They are working together to identify historic sites in woodland on the Storthes Hall estate, near Kirkburton.
The move has gathered pace after the discovery of a medieval iron-making complex branded as nationally important.
Nearly 40 members of Huddersfield and District Archaeologist Society made the discovery.
Heritage chiefs now want to know if there are any more remains nearby before determining the level of protection the site needs.
Abby Hunt, English Heritage archaeological investigator, said: "Once the society has mapped features in the woodland, we will work with them and medieval iron working experts to better understand the site."
Evidence has revealed that iron-making lasted for about 300 years at Storthes Hall, with the Black Death possibly signalling its demise.
English Heritage experts are helping out by giving tips to the amateur diggers on search methods.
Granville Clay, project co-ordinator for Huddersfield and District Archaeological Society, said: "Having experienced the thrill of discovering a site of national importance, our members are keen to learn new skills to help them track down all the potential archaeology on this fascinating estate.
"It is good for them and the local community and will help in the long-term protection of our local heritage."