2.1.1 Archaeological Techniques

In archaeology, the first step in conducting field research is to do a survey of an area that has the potential to reveal surface artifacts or cultural debris. Surveys can be done by simply walking across a field, or they may involve using various technologies, such as drones or Google Earth, to search for unusual topography and potential structures that would be difficult to see from the ground. Cultural artifacts that are found may become the basis for an archaeological excavation of the site. A random sampling of excavation units or test pits can determine a site’s potential based on the quantity of cultural materials found. GPS coordinates are often collected for each piece of cultural debris, along with notes on specific plants and animal found at the site, which can be indicators of potential natural resources. Features such as trails, roads, and house pits are documented and included in a full set of field notes. Government agencies have different protocols about what constitutes an archaeological site; the standard in many areas is six cultural objects found in close proximity to one another.

When preparing a site for excavation, archaeologists will divide the entire site into square sections using a grid system, which involves roping off measured squares over the surface of the site. This grid system enables archaeologists to document and map all artifacts and features as they are found in situ (in the original location). All objects and features uncovered are assigned catalog or accession numbers, which are written on labels and attached to the artifacts. These labels are especially important if artifacts are removed from the site.

Excavation is a slow process. Archaeologists work with trowels and even toothbrushes to carefully remove earth from around fragile bone and other artifacts. Soil samples may be collected to conduct pollen studies. Ecofacts—objects of natural origins, such as seeds, shells, or animal bones—found at a site may be examined by other specialists, such as zooarchaeologists, who study animal remains, or archaeobotanists, who specialize in the analysis of floral (plant) remains with an interest in the historical relationships between plants and people over time.

Every cultural and natural object and feature is fully documented in the field notes, with its exact placement and coordinates recorded on a map using the grid system as a guide. These coordinates represent an object’s primary context. If uncovered objects are moved before documentation takes place, the archaeologist will lose the archaeological context of that object and its associated data. Archaeological context is the key foundation of archaeological principles and practice. In order to understand the significance and even age of artifacts, features, and ecofacts, one needs to know their context and association with other objects as they were found in situ. Objects that have been removed from their primary context are said to be in a secondary context.

Careful and proper documentation is vitally important. This information becomes part of the archaeological record and guides and contributes to future research and analysis.