excavation methods

The governing concept is scientific sample integrity. Modern carbon, soil, chemicals or handling materials can mix with an archaeological sample and alter radiocarbon, chemical or environmental results. A contaminated sample may therefore produce a misleading date or interpretation. Option A is correct. Contamination is not primarily about increasing weight, improving colour or changing the depth of the excavation trench; those effects do not explain the need for protection.

The governing principle is that archaeological excavation is a controlled but destructive research process. Removing layers changes the context permanently, and the original sequence cannot be restored after excavation. Planned, limited excavation allows researchers to document evidence carefully and preserves unexcavated areas for improved methods and future questions. Option A is correct. Sites are not necessarily small, artefacts occur below the surface, and excavation can provide substantial information.

The governing concept is archaeological documentation and publication. An excavation report records the methods used, the sequence of layers, the objects recovered, their contexts, and the interpretations drawn from them. This makes the evidence available for checking and comparison by other researchers. Advertising, selling artefacts, or hiding photographs does not preserve reliable historical knowledge, so option A is correct.

The governing concept is spatial context. A site map records where walls, rooms, streets, layers, pits, burials, and artefacts were located in relation to one another. These positions help archaeologists reconstruct activities and settlement organisation. Decoration, tourist boundaries, and prices do not explain archaeological relationships, so option A is correct.

The governing concept is multidisciplinary archaeology. Bones may require osteological study, plant remains archaeobotanical analysis, soil specialist examination, and artefacts technological or material analysis. Combining these results produces a fuller reconstruction of past life. Entertainment, simple security, or trade cannot explain why different scientific skills are needed, so option A is correct.

The governing concept is human-environment interaction. Evidence about soils, water sources, pollen, seeds, animal remains, and landscape can show how people obtained food, practised farming, managed water, and selected a settlement location. The purpose is to reconstruct past conditions, not merely report modern weather, price objects, or build a new city; therefore option A is correct.

The governing concept is context-based scientific recording. An artefact has historical meaning not only because of its material or appearance, but also because of its layer, location, association, and condition. Systematic notes, drawings, photographs, and measurements preserve this information. Speed, monetary value, and finishing in one day can destroy evidence, so option A is correct.

The governing concept is stratigraphic context. A wall can divide two deposits that formed through different activities or at different times. Separate recording allows archaeologists to compare layers, identify rebuilding or changes in use, and establish a relative sequence. Mixing the soil or rushing the work would erase this evidence, while changing wall colour is irrelevant; therefore option A is correct.

The governing concept is vertical provenience and relative chronology. Measuring an object’s depth from a fixed datum helps place it within a particular layer and compare it with nearby finds. If deeper deposits are generally earlier and undisturbed, depth can contribute to a relative sequence, although context must also be assessed. Market value, colour, and immediate museum transfer are unrelated, so option A is correct.

The governing concept is post-excavation cataloguing and provenience control. An inventory gives each object an identification number and links it with its context, location, material, condition, storage place, and future analyses. This prevents loss, confusion, and unrecorded movement. Selecting only valuable objects or keeping items unlabelled defeats the purpose, while an inventory does not itself require re-excavation; therefore option A is correct.

A surface survey is a preliminary archaeological method in which researchers systematically examine the ground and record visible artefacts, ruins, soil changes and other features. Their distribution helps estimate the extent and character of a site before invasive excavation begins. Carbon dating gives age information, while washing and conservation are later procedures, so option A is correct.

Dividing an excavation into a measured grid gives every find a recorded spatial position, often linked to a square, layer and depth. This allows archaeologists to study associations between artefacts and structures and to reconstruct activity areas systematically. A grid does not automatically speed digging, reveal age instantly or preserve objects, so option B is correct.

Stratigraphy is the study of the sequence and relationships of soil deposits, cultural layers and structural remains at an archaeological site. In general, lower undisturbed layers are earlier than upper layers, allowing archaeologists to establish relative chronology, while recognising that disturbance can complicate interpretation. Typology classifies objects; it is not the study of layers. Therefore option B is correct.

The correct answer is B, the oldest. The law of superposition states that, in an undisturbed archaeological deposit, lower layers were laid down before the layers above them and are therefore generally older. Archaeologists use this relative sequence to interpret the order of occupation and activity. The rule must be applied carefully because pits, burials, erosion, construction, or other later disturbances can cut through and mix earlier deposits.

The correct answer is B. A vertical strip of unexcavated earth, commonly called a baulk or section, preserves a readable profile of the archaeological deposits. Its exposed face allows excavators to observe the order, thickness, colour, texture, and relationships of different layers. This record helps establish stratigraphy and prevents the excavation from becoming only a collection of objects without their original context.

The correct answer is A, datum point. A datum is a fixed, clearly identified reference point whose elevation is established and recorded. Measurements of finds, layers, floors, and features can then be related to this common baseline. This makes the vertical position of objects comparable across different parts of a trench and allows the excavation record to be reconstructed accurately after fieldwork ends.

Photographing an artefact before lifting preserves its exact position, orientation, depth, and relationship with nearby objects or structures. Once removed, those spatial relationships may be impossible to reconstruct. Photography therefore supports contextual interpretation rather than merely displaying the object.

A context number gives each layer, cut, fill, wall, floor, or other archaeological unit a unique identity in the site records. This system connects drawings, photographs, finds, samples, and descriptions, allowing archaeologists to analyse relationships without confusing separate deposits.

An archaeological plan is a measured horizontal drawing viewed from above. It records the position, shape, and relationship of walls, floors, pits, hearths, and finds within a trench. This differs from a section drawing, which represents the vertical sequence of deposits.

A section drawing is a measured vertical representation through an archaeological deposit or structure. It shows the order, thickness, and relationship of layers, fills, floors, and walls. Because it records the vertical sequence, it is especially useful for interpreting stratigraphy and relative chronology.

Sieving passes excavated soil through a mesh so that small bones, beads, flakes, seeds, and other tiny finds are retained while finer soil falls through. The mesh size can be selected according to the research aim, making this a practical recovery technique for otherwise easily missed evidence.

In flotation, soil is mixed with water and agitated. Charred seeds, chaff, and other light organic remains are less dense than water, so they float to the surface and can be collected separately. This evidence supports archaeobotanical study of past crops, diet, and environment.

A label records essential information such as the site, trench, layer or context, date, and sample type. Sealing prevents modern dust, plant material, or other outside matter from entering. Together, labelling and secure packaging preserve the sample’s provenience and analytical reliability.

A trial trench is a limited excavation opened to test whether archaeological deposits are present and to assess their depth, sequence, preservation, and likely extent. Its results help researchers plan a larger investigation while reducing unnecessary destruction of the site.

Horizontal excavation exposes a broad area within a particular occupational phase. It reveals the spatial arrangement and spread of houses, streets, walls, hearths, activity zones, and other features. Thus it is especially useful for reconstructing settlement layout rather than only establishing depth and sequence.