Miroslav, maybe you will know research of cistern at Vladař hillfort. This transdisciplinary research could inform you about optimal aproach:

https://www.researchgate.net/publication/226421977_Insight_into_the_environment_of_a_pre-Roman_Iron_Age_hillfort_at_Vlada_Czech_Republic_using_a_multi-proxy_approach

Article Insight into the environment of a pre-Roman Iron Age hillfor...

There has been research on a well of this period in Belgium at the site of Lede. You can contact "[email protected]" for more information. I beiieve that the information about it is only published in Dutch.

There is another site in Belgium 'Sint-Gillis-Waas' with Early Iron Age wells. You better contact  "[email protected]" for more information about them.

Kind regards,

Guy De Mulder

Dear Miroslav, 

yes, we have some macrofossil data from a Hallstatt period well at Crévéchamps (Meurthe-et-Moselle, Lorraine, France) and there are few other Hallstatt period wells from eastern France studied archaeobotanically by Françoise Toulemonde. These are macrofossil data, but multiproxy analysis of Hallstatt period wells are still lacking...

Let me know what you need for comparison.

Kind regards

Julian

Dear Miroslav,

in case you are still interested in references:

Renata Šoštarić, Antun L. Alegro, Vladimir Hrsak, Zvjezdana Stančić , Hansjörg Küster, Plant remains from an Early Iron Age well at Hajndl, Slovenia. Collegium Anthropologicum 33(4), December 2009, 1295-1301.

https://www.researchgate.net/publication/41147114_Plant_remains_from_an_Early_Iron_Age_well_at_Hajndl_Slovenia

The archaeobotanical samples analysed derive from a well-preserved well dated to the Early Iron Age (Hallstatt) according to pottery found in the sampled layers and on a radiocarbon dating (720-520 cal B.C.) of the wooden construction of the well. Cultivated plants (Panicum miliaceum, Linum usitatissimum, Papaver somniferum and Camelina sativa) were recorded in relatively small numbers whereas primary cereals are lacking. Together with quite a large number of accompanied weeds they suggest agriculture activities, but a mixture of weeds and ruderal plants was probably also growing inside the relatively large settlement complex and could have been included in the assemblages just by chance. The plant species composition indicates local vegetation developed under strong anthropogenic influence and on mainly moist and nitrogen-rich soils. Grassland plants and an almost complete lacking of tree and shrub species characteristic for the climax vegetation (deciduous mesophilous mixed forests) of the region also indicate at least local human activity.

Kind regards,

Stefan

Article Plant remains from an Early Iron Age well at Hajndl, Slovenia