An ash heap is defined as a specific object at an archaeological site, usually in the form of a separate hillock containing a layer of finely-dispersed greyish-yellow or ash-coloured soil. The existing assumptions about the formation and functional purpose of ash heaps, as special archaeological objects found near the Bronze Age pastoral settlements, have so far been poorly supported by scientific data. At the ash heap near the Sintashta fortified settlement of Stepnoye, Chelyabinsk Oblast, for the first time, large-scale and comprehensive studies were carried out on the structure of these deposits, their granulometric and geochemical composition, in combination with the analysis of plant macroremains, paleoparasites, microbiomorphic and palynological complexes, indicative bacterial groups, and keratinophilic fungi. Judging by the archaeological materials, it is patently obvious that this was a multifunctional object that developed over many centuries and played different roles at different stages. The results of the conducted analyses showed that the 45 cm thick “ash” horizon in the Stepnoye ash heap contains a significant proportion of a fine sand fraction, and not a silty fraction. An increase in the biophilic elements (predominantly calcium, as well as phosphorus and sulphur), accumulated mainly in the organic matter of faunal origin, was noted in the upper bench of the ash layer. However, the high concentration of phytoliths in the “ashy” deposits indicates that the layer was formed mainly as a result of the accumulation of a large amount of plant organic matter. The absence of charcoal and the scarcity of charred macroremains indicate that the deposited organic material was not burnt but decomposed naturally. The increased content of saprotrophic bacteria in the “ashy” layer also supports the natural decomposition of an organic matter. The composition of the phyto-lithic and pollen spectrum of the “ashy” horizon is not typical for the steppe of the south of Western Siberia, since it is dominated by a group of mixed herbs with elements of a ruderal flora, and not by cereals. All the data supports the hypothesis that the ash heap is the result of regular practice of cleaning of the floor and interiors of the buildings of the fortified settlement of Stepnoye. This is evidenced by the increase in the number of keratinophilic fungi, which decompose wool and hair and therefore accumulate in the occupational layer of the structures. Based on the results of the study, the hypotheses that the Stepnoye ash heap is a place of consolidated ash removal or composting of stable manure were rejected.

Keywords: ash heap, Bronze Age, Southern Trans-Urals, Sintashta settlement, phytoliths, pollen, geochemical composition, saprotrophic microbes, keratinophilic fungi, functional purpose.

 

This work is licensed under a Creative Commons Attribution 4.0 License.

Accepted: 28.09.2023

Article is published: 15.12.2023

 

Kupriyanova E.V., Scientific and Educational Center for Research on the Problems of Nature and Man, Chelyabinsk State University, Br. Kashyrinykh st., 129, Chelyabinsk, 454001, Russian Federation, E-mail: dzdan@mail.ru, https://orcid.org/0000-0001-8842-9976

 

Solomonova M.Yu., Altai State University, Institute of Biology and Biotechnology, prosp. Lenina, 61, Barnaul, 656049, Russian Federation, E-mail: solomonova@edu.asu.ru, https://orcid.org/0000-0002-4154-6048

 

Trubitsyna E.D., Tyumen Scientific Centre of the Siberian Branch RAS, Chervishevsky trakt st., 13, Tyumen, 625008, Russian Federation, E-mail: el.yuzh@gmail.com, https://orcid.org/0000-0002-7077-2618
 

Kashirskaya N.N., Institute of Physical, Chemical and Biological Problems of Soil Science, Russian Academy of Sciences, Institutskaya st., 2, Pushchino, 142290, Russian Federation, E-mail: nkashirskaya81@gmail.com, https://orcid.org/0000-0001-8353-3192

 

Filimonova M.O., Tyumen Scientific Centre of the Siberian Branch RAS, Chervishevsky trakt st., 13, Tyumen, 625008, Russian Federation, E-mail: mashaofilimonova@yandex.ru, https://orcid.org/0000-0001-9478-8449

 

Afonin A.S., Tyumen Scientific Centre of the Siberian Branch RAS, Chervishevsky trakt st., 13, Tyumen, 625008, Russian Federation, E-mail: hawk_lex@list.ru, https://orcid.org/0000-0001-8815-7659
 

Sharapov D.V., Tyumen State University, Volodarskogo st., 6, Tyumen, 625000, Russian Federation, E-mail: sharapov83@gmail.com, https://orcid.org/0000-0003-4749-7336
 

Ivanov S.N., Tyumen Scientific Centre of the Siberian Branch RAS, Chervishevsky trakt st., 13, Tyumen, 625008, Russian Federation, E-mail: ivasenik@rambler.ru, https://orcid.org/0000-0001-8566-0080

 

Ryabogina N.E., Tyumen Scientific Centre of the Siberian Branch RAS, Chervishevsky trakt st., 13, Tyumen, 625008, Russian Federation, E-mail: nataly.ryabogina@gmail.com, https://orcid.org/0000-0003-1098-0121