Finds and Artefact Processing

Before any micro-analysis begins, every piece of clothing and every personal effect recovered from a burial must be catalogued, photographed, and assessed by a specialist in textile history and manufacturing. This is not antiquarian pedantry. A shoe sole manufacturer's mould codes can place production within a two-year window. A garment care symbol system adopted by specific countries at specific dates is a hard terminus post quem. Country-of-origin labelling requirements have changed multiple times in the UK, EU, US, and Australia at known legislative dates, which means a garment labelled in a specific format was necessarily produced after that legislation came into force.

• Care symbols: ISO 3758 Ginetex symbols were introduced to UK garments in phases from the 1970s. The current symbol set differs from earlier versions; the washing basin symbol, temperature integers, and the addition of the dot-in-triangle tumble-dry symbol each have introduction dates.
• Shoe soles: outsole mould designs are modified regularly; specialist databases maintained by investigators and analysts can associate mould generations with production periods. Wear patterns may also indicate whether the shoe was actively used before burial.
• Synthetic fibres: certain polymer types entered mass clothing production in specific decades. Polyester blends, for instance, entered widespread UK clothing production in the late 1960s; Lycra/elastane in commercial quantities followed in the 1980s.
• Personal electronics: a mobile phone found with remains provides both a production date and, if data can be recovered, potentially the last call, location, and message history. IMEI numbers trace to specific manufacture dates.

The standard approach to grave fill is bulk sampling for pollen, seeds, and heavy residue. Micromorphology adds a layer that bulk sampling cannot provide: the spatial organisation of the material. To take a micromorphology sample the analyst cuts a Kubiena tin or large open-faced box into the face of an undisturbed section, removes the intact block, impregnates it with polyester or epoxy resin, and sections it to 25-30 micrometres. Under a polarising light microscope the analyst can see not just what particles are present but how they are arranged.

In burial contexts, micromorphology can distinguish between primary fills (material shovelled back into a grave during interment), secondary fills (material that accumulated later through natural processes or re-opening), and tertiary disturbance (bioturbation by roots or animals). It can detect whether a surface was used before the burial (trampled soil surfaces look different from undisturbed subsoil), whether material was burned above or near the grave, and whether the fill was placed in wet or dry conditions. These distinctions matter when the prosecution's case depends on establishing whether a body was buried immediately after death or held elsewhere and buried later.

Pollen grains are produced in vast quantities by flowering plants and persist for thousands of years in acidic or anaerobic environments because their outer wall (the sporopollenin exine) is chemically resistant to most degradation processes. Extracting pollen from burial fills involves chemical processing (typically HCl, HF, and acetolysis to remove the mineral and cellulose fraction), followed by slide preparation and microscopic counting using reference collections.

In burial contexts, pollen analysis serves three distinct purposes. First, it can date the burial by pollen stratigraphy: where a burial cuts through older deposits with distinct pollen zones reflecting vegetation history, the zone from which the fill was derived sets a terminus post quem. Second, it provides a vegetation fingerprint of the landscape around the burial site at the time of interment, useful when the remains have been moved and the question is whether the burial location matches the last known location of the victim. Third, pollen on clothing or in gut contents can sometimes link an individual to a specific geographic area or season, independent of the burial context itself.

Diatoms are single-celled algae with a siliceous cell wall (frustule) that survives long after the organism dies. They are highly habitat-specific: freshwater versus marine, eutrophic versus oligotrophic, acid versus alkaline, still versus flowing water. A diatom assemblage from a soil or sediment sample therefore carries geographic and habitat information. When diatoms are recovered from a grave fill in a location where those species would not naturally occur, the most likely explanation is that the fill material was sourced from somewhere else, or that organic material carrying those diatoms (decomposed body, clothing, footwear soil) was introduced from another environment.

This is the principle Ludes and colleagues at the Institute of Legal Medicine in Strasbourg applied to grave-soil analysis in the 1990s, extending their drowning-investigation diatom work to burial provenance. If the diatom assemblage in a grave fill is dominated by species characteristic of a specific river system, and if that system is geographically separated from the recovery site, the evidence supports the hypothesis that fill material was transported from elsewhere, possibly with the body. The comparison requires a reference collection of diatom assemblages from candidate source environments.

A forensic archaeologist's post-excavation report is not a list of analysis results. It is a structured argument about what the material evidence supports and what it does not, organised around the questions that the investigation needs to answer. Those questions typically are: who is this person; when did they die; was the body moved before burial; what was done to the body at or after death; and are there indicators of how the grave was prepared.

Integrating finds evidence means reading all the individual results against each other and against the stratigraphic record. A pollen assemblage that is inconsistent with the local vegetation, combined with diatoms from a distant river system in the fill, combined with shoe-sole soil deposits that carry clay minerals characteristic of that river catchment, is a powerful convergent argument for body movement. Any single line alone could be explained away. The convergence is much harder to dismiss.

• Establish the primary research questions before sampling. Undirected micro-analysis generates data without answers. Each sample must be planned to address a specific question: is the fill local? Was the body present at discovery location before death? When was the burial sealed?
• Retain contra-hypotheses. A good site narrative tests alternative explanations for each result. If the pollen assemblage is unusual, is it unusual because the fill was transported, or because the local vegetation was atypical for the area? If the clothing is worn and old, does that reflect poverty or a gap between manufacture and burial?
• Flag the limits of the evidence. Courts respond better to a careful analyst who states what the evidence cannot determine than to one who claims certainty beyond what the methods can support.

In mass grave recoveries, personal effects carry a weight of evidential and human significance that is absent from most single-burial cases. ICMP (International Commission on Missing Persons) and EAAF (Argentine Forensic Anthropology Team) protocols treat clothing and personal effects as corroborative identification evidence alongside DNA, because DNA results for victims of 1990s conflict are often delayed for months or years while families wait for confirmation.

Ante-mortem interviews with families collect systematic descriptions of clothing, jewellery, and personal items the victim was last known to be wearing. This information is stored in standardised DVI forms and compared against the post-mortem inventory of each set of remains. A positive comparison does not constitute identification on its own, because items may have been exchanged, stolen, or incorrectly attributed during a chaotic burial event, but a convergent match across clothing description, physical characteristic estimate, and personal item creates a presumptive identification that can direct urgent DNA analysis.