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The article presents the results of the first geoarchaeological study of the materials of Christian burials identified in the interior of the Middle Zelenchuk temple of the 10th century in the Nizhne-Arkhyz ancient settlement (Republic of Karachay-Cherkessia). The results of microbiomorphic (phytolith) and total phosphorus content analyses allowed us to reveal previously unknown features of the funeral rites of the multicultural and multi-ethnic Christian population of one of the largest cities of the North Caucasus in the Middle Ages. The differences in funerary practices between the 11th and 13th centuries became evident when studying even a small group of funerary complexes in which people of the same social group – representatives of the social elite of Western Alania – were buried. The geoarchaeological study showed an abundance of plant and animal organic matter in the burials. The complex analysis of archaeological materials and data obtained during the microbiomorphic study allowed us to conclude that members of the urban Christian community had several burial traditions: in stone boxes (tombs), in wooden frames, and a mixed ritual when a wooden structure was placed in a stone box. The presence of wooden bark particles in the burials seems to be related not so much to the material from which the burial structures were made as to the presence in the graves of bark or bast objects (bast caskets or boxes, birch bark amulets, toys, etc.). The tradition known from pagan Alanian burials of placing the head of the deceased on a “stone cushion” (more typical for male burials) was preserved in early Christian burials. In one of the four women’s graves studied, the analysis showed the presence of a “hay pillow.” Probably, before the burial, a ritual of washing the deceased was performed, as evidenced by the presence of diatoms and sponge spicules in the samples.

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.

The paper concerns the analysis of the local environment around the multi-layer settlements of Mergen 6 and 7 situated in the immediate vicinity of each other. The settlements existed successively (partly contemporaneously in the early and high Neolithic) in the forest-steppe belt of Western Siberia. Two methods were chosen to obtain the results: spore-and-pollen (palynological) and microbiomorphic analyses of the cultural layers of the settlements of Mergen 6 and Mergen 7. In the settlement of Mergen 6, the following samples were collected for the palynological and microbiomorphic investigation: a vertical column from the center of the ditch of the dwelling no.5; areal soil samples of the dwelling no.5 from underneath the pottery debris of the Neolithic and Eneolithic periods; areal samples from the bottom layer of the dwelling no.21. In the settlement of Mergen 7, two vertical core samples were selected for the pore-and-pollen analysis: in the ditch of the dwelling no.1; and in the inter-dwelling area. Samples from the hearthing of the dwellings and from the inter-dwelling space were collected for the microbiomorphic analysis. The obtained results show that both settlements existed during the forest-steppe conditions, although the original landscapes of the sites chosen by the people for building the settlements were different in the early and high Neolithic. It appears that during the early Neolithic, the settlement of Mergen 6 was associated with an open site with meadow-steppe vegetation; birch forests constituted a small part of the landscape, whilst there were no pine forests in the close vicinity. During the middle Neolithic, people in the settlement of Mergen 7 preferred to settle in a birch wood, having cleared out a small area to build the dwelling. The results of the microbiomorphic analysis show that, despite the lack of pine forests nearby the settlements, people still used pine timber in housebuilding, apparently, intentionally. The frequent occurrence of remains of the wood detritus at the level of the floor of the dwellings and under pottery supports the initial archaeological observations about timber decking inside the houses. However, pollen and phytolithic studies do not demonstrate a wide use of the wetland waterside vegetation in housebuilding, apparently, because the lake at the time was not overgrown on the banks by reed and cattail. Therefore, despite the close location of the two sites and their similar hunting-fishing specialization of the subsistences, their populations in different chronological periods preferred distinct local conditions.

The article presents the results of soil and archaeological study of the pedo-sedimentation sequence formed in the floodplain of the Derkul River (West Kazakhstan). The aim of the study was to reconstruct the stages of the alluvial sedimentogenesis alternating with relatively prolonged spans of soil formation, corresponding to the periods of floodplain agricultural development. It was established that floodplain sediment layer started to form as a result of stream sedimentation in the early Holocene; then this stage was followed by the relatively long-term soil formation period (5.6–3.8 cal. yr BC) resulting in a humus quasi-gleyic soil in the low floodplain (120–200 cm). The last period of soil formation (4.6–3.6 cal. yr BC) the floodplain was developed by man, which is displayed by the identified cultural horizon containing artifacts and having increased phosphorus content. At the end of the Subboreal period the next stage of alluvial sedimentation, started by the changed river hydrology regime, was found to be chronologically separated from the stage of stationary development of the floodplain by settled humans.

The Beganchik locality is a stratigraphic sequence of loessic deposits, pedogenic horizons and Paleolithic occupations located at the Kama-Volga confluence. The sequence is exposed on a bluff formed on the west side of an erosional remnant between the Kuybyshev Reservoir and the former channel of the Aktay River. Although the site is known for its Terminal Paleolithic-Mesolithic occupations of the Pleistocene-Holocene transition, evidence of older occupations and remains of fauna has been identified. Our research team identified evidence of human presence associated with a pedogenic horizon of MIS 3 age. Two AMS radiocarbon ages from a hearth produced ages around 47 000 years BP. Pollen and phytoliths from two soils horizons, including the one associated with the hearths indicate a steppe environment coincident with the formation of correlative soils elsewhere in the Russian Plain.

Silica biominerals are deposited as amorphous solid structures in plant cells and tissues, providing rigidity to different plant parts and assisting in defence. The shape and size of phytoliths are well established and serve as a useful tool in taxonomic analyses. For the first time we extracted and studied silica biominerals of five marine macroalgae, which we observed by light microscopy, scanning electron microscopy, and X-ray diffraction analysis (XRD). More than nine different morphotypes of phytoliths ranging from ≥ 10 to ≥ 350 μm in size were found. Some of them were phytoliths made of silica while others showed characteristics of different minerals of calcium. In our study, the “honeycomb” formations were only recorded in Laurencia tropica Yamada and pyramid tabular ones were found only in Tichocarpus crinitus (S.G. Gmelin) Ruprecht. The XRD analysis showed that they consisted of virgilite and gypsum substance, respectively. Silica phytoliths are intrinsic parts of the algae and their morphological characterization can provide the basis for palaeo-reconstruction and taxonomic investigation of brown and red algae in palaeontological studies of fossils where all organic matter has decayed.

The article analyzed main phytolith morphotypes produced and anatomical microscopic structure of grass leaf epidermis in dominant species in the south of West Siberia. Phytoliths are silica microfossils formed inside plant cells that allow identification of plants in paleobotanical studies. The choice of objects in the study was based on presence of strong silicification in selected dominant grasses. For the first time in our region, phytolith assemblage from a plant (% of morphotypes) was compared to the anatomical structure of leaf epidermis in Poaceae. We studied seven Poaceae species that together produced all major morphotypes found in soils of the region: Achnatherum sibiricum, Agrostis gigantea, Elymus dahuricus, Festuca pseudovina, Festuca pratensis, Koeleria cristata, Phalaroides arundinacea. Because all of these species were regionally important dominants, their phytoliths would help diagnose specific plant communities. We showed localization of main phytoliths in the leaves of these species and compared short cell and trichome distribution in a plant with its silicification. The results allowed to better visualize 3D shapes of epidermal cells. Most common phytoliths were formed as cell wall casts that repeat the shape of the cell in question. Some short cells, for example rondels and bilobates, did not match the shape of the cell, indicating active shaping process present inside the cells. An interesting result was a lack of silicification of trichomes in some grasses despite heavy trichome presence. This study will help researchers to avoid mistakes in identifying common dominant plants based on their phytolith record in paleosediments, within West Siberia and across all of Northern Eurasia.

Microbiomorphic analysis is a detailed study of microscopic particles of biogenic nature (plant detritus, phytoliths, shells of diatoms, spicules of sponges, pollen, etc.). Each of such particles characterizes environmental conditions at the time of its formation and, therefore, provides useful information for palaeoenvironmental reconstructions. The Early Pleistocene deposits were studied in Armenia at the sites, where tools of ancient hominids (Early Acheulian) were found. The genesis of these deposits was identified. It was shown that these ancient alluvial-lacustrine sediments were transformed by soil-forming processes. The environmental conditions at the time of the ancient hominids’ migration were reconstructed.

As the result of the investigaton of geochemically associated range of texture-differentiaded and organo-accumulative soils with the second humus horizon, we discovered that in microbiomorphic profile the specificities of the second humus horizon forming are reflected. These specificities are stipulated by the topographic location and the conditions of water regime of the soil in the past. The evolution of soils in the elluvial position of the catena was manifested in the change of meadow soil forming process (humus-quasigleic soils) on the podzol-forming process. In the transit positions the prototype of the soil with the second humus horizon was functioning in the wetter conditions and was characterized by the features of meadow-boggy soil forming process - humic gley soil. In the trans-accumulative position the meadow-boggy soil forming process (humic gley type of the soil) was changed on the forest type of the soil forming process (podzol formation) later than for the soils, which are located in higher topography positions.

The article presents the results of analysis of the phytolith composition of cereals in the Northern Altai. Some 23 species of Poaceae have been studied. For each species, we analyzed a set of silicon particles in leaves, stems, and generative structures. We selected from 22 to 27 significant morphotypes of phytoliths, depending on their morphological affinity. Our results were compared with the wetting factor. We also analyzed the ratio of the composition of phytoliths of cereals and their ecological (edaphotopic) groups and life forms. We founded the correlations between several morphotypes of cereal phytoliths and life forms with optimum species moistening. [ABSTRACT FROM AUTHOR]

The article presents the first results of the comprehensive scientific research conducted on the Bulgar fortified settlement site in 2011. Samples for analysis were selected in the form of series of vertical columns from excavation walls. The species of trees used in the construction, the composition of the mud bricks and the bonding mortar, as well as the genesis of individual cultural layers have been identified. It has been found out that the settlement development and functioning had been reciprocating in nature: periods of intense habitation of its individual sections were followed by short stages of desolation. In all investigated soil columns with the cultural layers there are streaks consisting solely of phytoliths and cuticle casts. A possible explanation of the phenomenon may be that the plot was covered with layers of manure of significant length and capacity. This conclusion is debatable and requires further research.

The article presents the first results of the comprehensive scientific research conducted on the Bulgar fortified settlement site in 2011. Samples for analysis were selected in the form of series of vertical columns from excavation walls. The species of trees used in the construction, the composition of the mud bricks and the bonding mortar, as well as the genesis of individual cultural layers have been identified. It has been found out that the settlement development and functioning had been reciprocating in nature: periods of intense habitation of its individual sections were followed by short stages of desolation. In all investigated soil columns with the cultural layers there are streaks consisting solely of phytoliths and cuticle casts. A possible explanation of the phenomenon may be that the plot was covered with layers of manure of significant length and capacity. This conclusion is debatable and requires further research.