Yedoma Ledger
| Yedoma Ledger | |
|---|---|
 Plaque with incised geometric registers | |
| Material | Mammoth ivory (Mammuthus primigenius) |
| Writing | Geometric incisions |
| Created | Substrate plausibly Last Interglacial (~125 ka); age of carving undetermined |
| Discovered place | Lower Indigirka basin, northeast Siberia (Russia) |
| Discovered date | Late August (year per preliminary report) |
| Present location | Regional heritage authority |
| Dimensions | ~216 × 54 × 39 mm; ~486 g |
The Yedoma Ledger is a worked plaque of mammoth ivory reportedly recovered from permafrost in the lower Indigirka region of northeast Siberia. The object was discovered and handled in the field by a small team led by J. Levi Schültke during a rapid-impact survey of thaw gullies commissioned to document erosion threats to organic artefacts; Schültke’s group was engaged for its prior experience with cold-chain recovery and identification of proboscidean ivory.[1] Its carved surface shows parallel bands of straight and oblique incisions, including chevrons and cross-hatching. The preliminary report describes controlled cold-chain recovery and non-destructive documentation but does not advance a cultural attribution or secure the age of the carving itself.[1]
Discovery and context
According to the report, the plaque was noticed by the team in a thaw gully within ice-rich loess (Yedoma) and recovered with surrounding sediment using bagged blocks and refrigerated transport overseen by the regional heritage authority.[1] Yedoma sequences in Siberia are known to preserve Late Pleistocene faunal remains and organic materials that can be reworked by thermokarst processes, complicating archaeological context.[2]
Description
The object follows the natural camber of tusk ivory and presents a prepared, flatter face with multiple incised registers bounded by guide lines. Identification as mammoth ivory is supported by observation of Schreger lines, a standard criterion in proboscidean ivory analysis.[3]
Dating
Screening methods reported include FTIR for collagen/mineral preservation, amino acid racemization (AAR) on a detached lamella, and optically stimulated luminescence (OSL) on associated sediment. These results are consistent with an ancient Pleistocene substrate but do not directly date the carving. Open-system behavior in bones and dentine limits the reliability of some radiometric approaches; targeted dating of incision surfaces has not yet been published.[1][4][5]
Interpretation
Published descriptions remain neutral and descriptive; no consensus interpretation (notation, decoration, or other function) has been advanced. Pending secure dating and replication studies, the Yedoma Ledger is cited as a candidate example of worked ivory from permafrost context rather than as evidence for a particular symbolic system.[1]
Possible relation to the Kristiansen corpus
Since 2024 the Ledger has been discussed, so far only informally, as a candidate physical carrier for material in the Kristiansen coding system. The suggestion rests on three observations rather than on any direct comparison of signs.
First, chronology. Schültke's preliminary report, which circulated in 2021, describes the incised face as a series of registers bounded by guide lines but publishes only one photograph and no tracing. Jan-Tage Kristiansen's 2023 correspondence note and his longer working paper were based on drawings and a transcription received by anonymous email in the two years that followed, with no indication of the object drawn.[6]
Second, geometry. The scapula inscription (KS-01) is a short abecedary and cannot be the Ledger, whose registers run the full 216 mm of the prepared face. Kristiansen's longer companion inscription, however, was supplied as a transcription only: six lines, 146 tokens, medium unstated. At the roughly one-centimetre sign pitch reported for the scapula, a 216 mm register holds about twenty signs, which is in keeping with a six-line text averaging some twenty-four tokens a line. The stroke repertoire described by Schültke, straight and oblique cuts with chevrons and cross-hatching, is consistent with the Triangle, Barred-post and Comb families of the signary, though it is equally consistent with a great deal of Upper Palaeolithic ornament.
Third, the absence of any other candidate. The Ledger is the only object publicly documented from a controlled recovery whose incisions are organised in ruled registers of the kind the Kristiansen corpus presupposes.
None of this amounts to an identification. Schültke has not commented on the Kristiansen literature, and his report predates it. Kristiansen, asked whether the anonymous transcription could derive from the Ledger, replied that he had “no basis for saying so and no basis for denying it,” and that the question would be settled by a full-resolution tracing of the Ledger's registers, which the regional heritage authority has not released.[6] Until such a tracing exists the Ledger remains, in the words of its own preliminary report, a candidate example of worked ivory from permafrost context, and the Kristiansen corpus remains a set of drawings without an object.
Significance
The find highlights both the potential and the difficulties of researching artefacts emerging from rapidly changing permafrost landscapes. It has been noted in discussions of best practice for recovery, minimal-intervention conservation (e.g. reversible consolidants), and multi-modal imaging such as reflectance transformation imaging in Arctic and sub-Arctic contexts.[1][7]
See also
- Kristiansen coding system
- Scapula Glyph Inscription
- Yedoma
- Woolly mammoth
- Pleistocene archaeology
- Reflectance transformation imaging
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 J. Levi Schültke, A Mammoth-Ivory Plaque with Geometric Incisions from Northeast Siberia: Discovery, Context, and Materials Analysis (preliminary field and materials report, Seminar für Archäologie der Periglazialzonen, 2021).
- ↑ Lutz Schirrmeister, “Yedoma Permafrost Landscapes as Past Archives and Future Change Hotspots,” Frontiers in Earth Science 10 (2022): 929873, [1](https://doi.org/10.3389/feart.2022.929873).
- ↑ “Identification Guide for Ivory and Ivory Substitutes,” CITES (2020), [2](https://cites.org/sites/default/files/ID_Manuals/Identification_Guide_for_Ivory_and_Ivory_Substitutes_ENGLISH.pdf).
- ↑ K. Penkman, “Dating the Paleolithic: trapped charge and amino acid geochronology,” Evolutionary Anthropology 31, no. 5 (2022): 203–222, [3](https://doi.org/10.1002/evan.21958).
- ↑ O. B. Lian, “Dating the Quaternary: progress in luminescence dating,” Quaternary Science Reviews 25, nos. 19–20 (2006): 2449–2468, [4](https://doi.org/10.1016/j.quascirev.2005.11.013).
- ↑ 6.0 6.1 Jan-Tage Kristiansen, “Twin renderings, single template: a ruled signary on a putative cervid scapula,” correspondence note, language 27 (October 2023): 1073–1074.
- ↑ Historic England, Multi-Light Imaging for Heritage Applications (incl. H-RTI) (2016), [5](https://historicengland.org.uk/images-books/publications/multi-light-imaging-heritage-applications/).