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Археологический контекст образцов AB10 и AB37 (из новой работы):
S1.2.1.6.
The Voronovo burial site (Yaroslavl)
Geographic Information: The burial ground is located on the outskirts of the village of Voronovo in the Uglichsky district of the Yaroslavl region, on the bank of the Uleyma river. Excavation History: A total of the 21 barrows were excavated by A.I. Kelsiev in 1878. By the time of excavation, the burial barrows had been partially damaged due to construction activities.
Summary of sampled materials: The diameters of the barrows generally did not exceed 6 m, with the exception of one the barrow (№ 9), which measured over 8.5 m (4 sazhen) and contained two skeletons. The heights of the barrows varied between 0.35 and 2.1 m, and the burial depth of the skeletons ranged from 0.35 to 1.4 m. The burials were located in soil pits, the boundaries of which were poorly defined. The skeletons were positioned extended on their backs, with the head oriented to the east or southeast. The burial practices and artefacts suggest ancient Rus’ cultural context. Dating: 11th-12th centuries CE34. Genetic analysis was carried out on two skulls that are kept in the Museum of Anthropology, Lomonosov Moscow State University.
AB10. Barrow 19
Grave type: The burial was located in a grave pit (depth 0.7 m) within the barrow (diameter and height unknown).
Dating: 11th-12th centuries CE.
Skeletal information: The skeleton was lying extended on its back, head to the east-southeast. The skull was turned to the left. The burial is identified as belonging to a man.
Grave goods: A single ring.
Museum ID: 1080.
Genetic subcluster: Outliers.
S1.2.1.12.
The Pustosh Popova burial site (Kostroma)
Geographic Information: This ancient Rus’ burial ground is situated in the Krasnoselsky district of the Kostroma region, near the village of Antonovskoe, on the left bank of the Volga river, on the upper floodplain terrace.
Excavation History: Excavations were conducted by N.F. Nefedov, 1895.
Summary of sampled materials: The burial ground consisted of five barrows, each with stone perimeters around the barrows. All barrows were hemispherical in shape, ranging from 16 to 25 m in diameter and 1 to 2 m in height. All burials were single interments, located in the centre of the barrow at the subsoil level. The deceased were found in an extended supine position, with their heads oriented to the west-southwest. The left arm was placed across the chest, while the right arm was extended along the body. The grave goods included temporal rings, bell-shaped pendants, cross-shaped rhomboid pendants, twisted ribbed rings, an iron axe, and an iron knife. The burial practices and artefacts suggest ancient Rus’ cultural context. 12th-13th centuries CE39.
Genetic analysis was carried on a bone sample obtained from a single skull that is kept in the Museum of Anthropology, Lomonosov Moscow State University.
AB37Skeletal information: The specific association of skeletal remains with the burials investigated in the barrow is not determined. These remains were registered and stored in the Museum of Anthropology, Lomonosov Moscow State University under the name "Plyos". Anthropological identification of the skeletal remains has not been conducted.
Museum ID: 1329.
Genetic subcluster: Rus_SWest.

Любопытно, что AB10 из-под Углича погребен головой на восток/юго-восток, а AB37 - запад/юго-запад. Но АВ10 сильно субстратный:
Довольно значительная часть погребенных имела и другие ориентировки — головой к северу, югу или востоку. Применительно к Костромскому Поволжью такое могло быть связано с проявлением дорусских финских традицийhttps://kostromka.ru/archeology/russia.php