In archaeology , survey or field survey is a type of field research by which archaeologists (often landscape archaeologists ) search for archaeological sites and collect information about the location, distribution and organization of past human cultures across a large area (e.g. typically in excess of one hectare , and often in excess of many km ). Archaeologists conduct surveys to search for particular archaeological sites or kinds of sites, to detect patterns in the distribution of material culture over regions, to make generalizations or test hypotheses about past cultures, and to assess the risks that development projects will have adverse impacts on archaeological heritage.
77-610: The Manasseh Hill Country Survey is an archaeological survey of the Manasseh Hill Country, a region in Israel and the West Bank associated with the territory of the biblical Israelite tribe of Manasseh . It began in 1978 under the direction of Israeli archaeologist Adam Zertal , and continues for over 40 years. Archaeologist Israel Finkelstein described the survey as “one of the most important ever undertaken in
154-498: A dumpy level or total station by relation to the site temporary benchmark (abbr. T.B.M). Samples of deposits from contexts are sometimes also taken, for later environmental analysis or for scientific dating . Digital tools used by field archaeologists during excavation include GPS , tablet computers , relational databases , digital cameras , 3d laser scanners , and unmanned aerial vehicles . After high quality digital data have been recorded, these data can then be shared over
231-544: A site plan , and then partially excavating those features ( sampling ). The approach is undertaken when a site is to be destroyed by development and no satisfactory method of preserving archaeological remains in situ can be devised or adequate funding and time have not been factored into development project planning to allow for a full archaeological investigation. This describes the use in excavations of various types and sizes of machines from small backhoes to heavy duty earth-moving machinery. Machines are often used in what
308-523: A building such as church to produce a "phase." A less rigorously defined combination of one or more contexts is sometimes called a feature . Phase is the most easily understood grouping for the layman as it implies a near contemporaneous Archaeological horizon representing "what you would see if you went back to a specific point in time". Often but not always a phase implies the identification of an occupation surface "old ground level" that existed at some earlier time. The production of phase interpretations
385-414: A grouping of contexts and their associations are the purpose of the photography. Finds from each context are bagged and labeled with their context number and site code for later cross-reference work carried out post-excavation. The height above sea level of pertinent points on a context, such as the top and bottom of a wall are taken and added to plans sections and context sheets. Heights are recorded with
462-910: A mobile GIS for referencing, for sampling purposes, and for groundtruth updating directly in the field, resulting a more informed archaeological survey process. Fieldwalking involves picking up scattered artifacts in ploughed fields. In heavily wooded areas such as Scandinavia or the North American Northeast, or deeply alluviated areas as in the Netherlands, fieldwalking is not always a practical method. Humus and fallen leaves in forested areas, silt on alluvial fans, or turf in built-up neighbourhoods may render near-surface artifacts and sites invisible even at short distances. In such instances, archaeological surveyors may concentrate on above-ground structures such as burial cairns, collapsed field walls and rock art panels, look for unnatural changes in
539-422: A particular locale. It is usually a simple matter to gain permission to perform a cultural field survey, especially a non-intrusive one. If the area is privately owned, the local laws may or may not require the landowners' co-operation. Permission for an intrusive form of survey may be more difficult to acquire, due to the fear of destroying evidence or property values and the threat of lawsuit for said damages from
616-400: A particular site or a particular kind of archaeological material. For example, they might be searching for a particular shipwreck or an historic fort whose exact location is no longer certain. However, they may also be searching for archaeological materials in particular locations to test hypotheses about past use of those spaces. Sampling surveys , on the other hand, have the goal of obtaining
693-517: A pigsty onto it and drained the pigsty into the nettle patch. Later still, the original wall blew over and so on. Each event, which may have taken a short or long time to accomplish, leaves a context . This layer cake of events is often referred to as the archaeological sequence or record . It is by analysis of this sequence or record that excavation is intended to permit interpretation, which should lead to discussion and understanding. The prominent processual archaeologist Lewis Binford highlighted
770-492: A range of techniques is selected to be applied within an appropriate overarching method. An area may be considered worthy of surveying based on the following: Map regression, comparing maps from different periods of the same area, can reveal past structures that were recorded but are no longer visible as surface features. Using modern maps to transcribe or re-project earlier maps can help to locate these features with contemporary survey controls and techniques. Aerial photography
847-445: A regional context. A common role of a field survey is in assessment of the potential archaeological significance of places where development is proposed. This is usually connected to construction work and road building. The assessment determines whether the area of development impact is likely to contain significant archaeological resources and makes recommendations as to whether the archaeological remains can be avoided or an excavation
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#1732801792062924-443: A representative sample of some population of sites or artifacts in order to make generalizations about that population. This involves some probability sampling of spatial units, such as random or stratified random sampling of geometrical (often square) or irregular spatial units. Conventionally, fieldwalking in grids or along lines called transects has formed the backbone of archaeological survey fieldwork, at least where visibility
1001-409: A site into these basic, discrete units, archaeologists are able to create a chronology for activity on a site and describe and interpret it. Stratigraphic relationships are the relationships created between contexts in time representing the chronological order they were created. An example would be a ditch and the back-fill of said ditch. The relationship of "the fill" context to the ditch "cut" context
1078-410: A site. There are two basic types of modern archaeological excavation: There are two main types of trial excavation in professional archaeology both commonly associated with development-led excavation: the test pit or trench and the watching brief. The purpose of trial excavations is to determine the extent and characteristics of archaeological potential in a given area before extensive excavation work
1155-426: A sub-group could be the three contexts that make up a burial: the grave cut, the body and the back-filled earth on top of the body. In turn sub-groups can be clustered together with other sub-groups by virtue of their stratigraphic relationship to form groups which in turn form " phases ". A sub-group burial could cluster with other sub-group burials to form a cemetery or burial group which in turn could be clustered with
1232-417: A successful mission completion. The most important parts of the survey are analysis and evaluation. The types of questions that archaeologist often ask of survey data include: what is the evidence for first occupation of an area; when was this area occupied; how are sites distributed; where are sites located; what evidence is there for a settlement hierarchy; what sites are contemporary with each other; how has
1309-516: A temple floor that was thousands of years old. During early Roman periods, Julius Caesar's men looted bronze artifacts, and by the medieval period, Europeans had begun digging up pots that had partially emerged from erosion, and weapons that had turned up on farmlands. Antiquarians excavated burial mounds in North America and North-West Europe, which sometimes involved destroying artifacts and their context, losing information about subjects from
1386-461: A trench cut for a gas pipe in a road. In the US, a method of evaluation called a Shovel test pit is used which is a specified half meter square line of trial trenches dug by hand. Archaeological material tends to accumulate in events. A gardener swept a pile of soil into a corner, laid a gravel path or planted a bush in a hole. A builder built a wall and back-filled the trench. Years later, someone built
1463-415: A wide range of conditions. While common metal detectors are geophysical sensors, they are not capable of generating high-resolution imagery. Other established and emerging technologies are also finding use in archaeological applications. Although geophysical surveying has been used in the past with intermittent success, good results are very likely when it is applied appropriately. It is most useful when it
1540-437: Is "the fill" occurred later in the sequence, i.e., you have to dig a ditch first before you can back-fill it. A relationship that is later in the sequence is sometimes referred to as "higher" in the sequence and a relationship that is earlier "lower" though the term higher or lower does not itself imply a context needs to be physically higher or lower. It is more useful to think of this higher or lower term as it relates to
1617-410: Is a building underneath a field. In such a case, the only way to decide if an excavation is worth the cost is to carefully analyze the evidence to determine which part to trust. On the one hand, the geophysics might just show an old and forgotten water-pipe, but it might also show the wall of just the building the archaeologists were looking for. The analysis therefore includes careful examination of all
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#17328017920621694-405: Is a good tool for planning a survey. Remains of older buildings often show in fields as cropmarks; just below the topsoil, the remains may affect the growth of crops or grass. There should preferably be photographs of the same area at different times of the year, allowing the analyst to find the best time to see cropmarks. If the indicator that started the process was not a record of previous work,
1771-409: Is an unrepeatable process, since the same area of the ground cannot be excavated twice. Thus, archaeology is often known as a destructive science, where you must destroy the original evidence in order to make observations. To mitigate this, highly accurate and precise digital methods can be used to record the excavation process and its results. Single context recording was developed in the 1970s by
1848-508: Is becoming an increasingly useful and cost-effective tool in archaeology. Geophysical instruments can detect buried archaeological features when their electrical or magnetic properties contrast measurably with their surroundings. In some cases, individual artifacts, especially metal, may be detected as well. Readings taken in a systematic pattern become a dataset that can be rendered as image maps for interpretation. Survey results can be used to guide excavation and to give archaeologists insight into
1925-548: Is bore holes. Small holes are drilled into the ground, most often with hand-powered bores. The contents are examined to determine the depths at which one might find cultural layers, and where one might expect to strike virgin soil. This can be valuable in determining the cost of an excavation - if there is a build-up of several meters of soil above the layers the archaeologist is interested in, the price will obviously be much higher than if artifacts are found only centimeters below ground. One way to classify archaeological field surveys
2002-412: Is called salvage or rescue archaeology in developer-led excavation when there are financial or time pressures. Using a mechanical excavator is the quickest method to remove soil and debris and to prepare the surface for excavation by hand, taking care to avoid damaging archaeological deposits by accident or to make it difficult to identify later precisely where finds were located. The use of such machinery
2079-521: Is fairly good. A single researcher or team will walk slowly through the target area looking for artifacts or other archaeological indicators on the surface, often recording aspects of the environment at the time. The method works best on either ploughed ground or surfaces with little vegetation. On ploughed surfaces, as the soil is turned regularly artifacts will move to the top. Erosion and soil loss on uncultivated and lightly vegetated soil (e.g., in semi-arid environments) may cause artifacts to also 'rise' to
2156-475: Is largely based on the Law of Superposition . The Law of Superposition indicates that layers of sediment further down will contain older artifacts than layers above. When archaeological finds are below the surface of the ground (as is most commonly the case), the identification of the context of each find is vital to enable the archaeologist to draw conclusions about the site and the nature and date of its occupation. It
2233-492: Is necessary before development work can commence. Archaeologists use a variety of tools when carrying out surveys, including GIS , GPS , remote sensing , geophysical survey and aerial photography . Survey work is conducted for a variety of reasons, some of which are motivated by threats to the preservation of archaeological material. These threats may include proposed land development or risks associated with processes such as decay or erosion. Surveys can also be conducted in
2310-543: Is not good practice. After removing a context or if practical a set of contexts such as the case would be for features, the "isolate and dig" procedure is repeated until no man made remains are left on site and the site is reduced to natural . "Strip, map and sample" is a method of excavation applied in the United Kingdom to preserve archaeological remains by record in the face of development threats. It involves machine stripping an area, plotting observed features onto
2387-486: Is often routine (as it is for instance with the British archaeological television series Time Team ) but can also be controversial as it can result in less discrimination in how the archaeological sequence on a site is recorded. One of the earliest uses of earth-moving machinery was at Durrington Walls in 1967. An old road through the henge was to be straightened and improved and was going to cause considerable damage to
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2464-404: Is one of the first goals of stratigraphic interpretation and excavation. Digging "in phase" is not quite the same as phasing a site. Phasing a site represents reducing the site either in excavation or post-excavation to contemporaneous horizons whereas "digging in phase" is the process of stratigraphic removal of archaeological remains so as not to remove contexts that are earlier in time "lower in
2541-449: Is prohibitively high. The various Scandinavian sites and monuments registers mainly list above-ground monuments, not ploughed-out sites with scattered pottery. Because of the high costs involved in some kinds of surveys, it is often helpful to use " predictive modelling " to narrow down the search for archaeological materials. This is particularly important for purposive surveys, but can also be used to guide sampling surveys by eliminating
2618-414: Is the archaeologist's role to attempt to discover what contexts exist and how they came to be created. Archaeological stratification or sequence is the dynamic superimposition of single units of stratigraphy or contexts. The context (physical location) of a discovery can be of major significance. Archaeological context refers to where an artifact or feature was found as well as what the artifact or feature
2695-448: Is the exposure, processing and recording of archaeological remains. An excavation site or "dig" is the area being studied. These locations range from one to several areas at a time during a project and can be conducted over a few weeks to several years. Excavation involves the recovery of several types of data from a site. This data includes artifacts (portable objects made or modified by humans), features (non-portable modifications to
2772-421: Is the role of specialists to provide spot dating information on the contexts being removed from the archaeological record. This can provide advance warning of potential discoveries to come by virtue of residual finds redeposited in contexts higher in the sequence (which should be coming offsite earlier than contexts from early eras and phases). Spot dating also forms part of a confirmation process, of assessing
2849-498: Is the theoretical width of a transect in which the number of artifacts detected outside the sweep is identical to the number missed within the sweep. The poorer the visibility, the poorer the contrast between the artifact "targets" and their surroundings, or the poorer the surveyor's skill or attention, the narrower the sweep width will be. Modern technology such as GPS has made survey recording much easier, as positions of artifacts or artifact clusters ("sites") can be taken well within
2926-524: Is to divide them into two types: intensive and extensive . The former is characterised by the complete or near-complete coverage of the survey area at a high resolution, most often by having teams of survey archaeologists walk in a systematic way (e.g. in parallel transects ) over parcels of the landscape in question, documenting archaeological data such as lithics , ceramics and/or building remains. However, variations in artifact visibility related to topography, vegetation, and soil character, not to mention
3003-428: Is undertaken. This is usually conducted in development-led excavations as part of Project management planning. The main difference between Trial trenching and watching briefs is that trial trenches are actively dug for the purpose of revealing archaeological potential whereas watching briefs are cursory examination of trenches where the primary function of the trench is something other than archaeology, for example
3080-467: Is used in a well-integrated research design where interpretations can be tested and refined. Interpretation requires a knowledge both of the archaeological record , and of the way it is expressed geophysically. Appropriate instrumentation, field survey design, and data processing are essential for success, and must be adapted to the unique geology and archaeological record of each site. In the field, control of data quality and spatial accuracy are critical to
3157-532: The Mount Ebal Site (1980) and Ahwat (1992). The survey's findings were published in seven volumes, originally in 1992 in Hebrew, with an English edition first published in 2000. The Manasseh Hill Country Survey's finding were published in seven volumes. The volumes cover the following areas: Archaeological survey Archaeological surveys may be: (a) intrusive or non-intrusive , depending on
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3234-561: The museum of London (as well as earlier in Winchester and York) and has become the de facto recording system in many parts of the world and is especially suited to the complexities of deep urban archaeology and the process of Stratification . Each excavated context is given a unique "context number" and is recorded by type on a context sheet and perhaps being drawn on a plan and/or a section . Depending on time constraints and importance contexts may also be photographed, but in this case
3311-835: The Land of Israel”. The survey covered an area of more than 2,500 square kilometers, from the Jordan Valley in the East to the Israeli coastal plain in the West, and from Nahal Iron in the North to the north-eastern point of the Dead Sea in the South. It unearthed over 200 Iron Age I sites covering the area's settlement from 1250 to 1000 BCE. Among the sites discovered during the survey were
3388-444: The absence of threat as part of a research program or conservation efforts. Prior to engaging in fieldwork, desk-based assessments will likely take place, during which, written, visual, and electronic information is gathered for the purpose of evaluating and developing a plan for future fieldwork. Consideration should be given to the nature of the landscape (vegetation coverage, existing settlement or industry, soil depth, climate) before
3465-410: The archaeologists will need to check if any work has been done prior to commencement of the pending project. As many older surveys and excavations were published in papers that are not widely available, this may be a difficult task. A common way to handle this is through a visit to the area, to check with local museums, historians and older people who might remember something about the former activities in
3542-513: The archaeology. Rosemary Hill describes how Geoffrey Wainwright "oversaw large, high-speed excavations, taking bulldozers to the site in a manner that shocked some of his colleagues but yielded valuable if tantalising information about what Durrington had looked like and how it might have been used." Machines are used primarily to remove modern overburden and for the control of spoil . In British archaeology mechanical diggers are sometimes nicknamed "big yellow trowels". Archaeological excavation
3619-433: The contexts position in a Harris matrix , which is a two-dimensional representation of a site's formation in space and time. Understanding a site in modern archaeology is a process of grouping single contexts together in ever larger groups by virtue of their relationships. The terminology of these larger clusters varies depending on practitioner, but the terms interface, sub-group, group and land use are common. An example of
3696-424: The development of the site may be drawn from this work, but to understand finer details of a site, excavation via augering can be used. During excavation, archaeologists often use stratigraphic excavation to remove phases of the site one layer at a time. This keeps the timeline of the material remains consistent with one another. This is done usually though mechanical means where artifacts can be spot dated and
3773-466: The evidence collected. A method often used to determine its value is to compare it to sites of the same period. As the number of well-documented surveys grow, this becomes a slightly easier task, as it is sometimes easier to compare two survey results than to compare a survey result with an excavated site. However, it remains difficult to compare datasets produced by different research teams. Excavation (archaeology) In archaeology , excavation
3850-487: The fact that the archaeological evidence left at a site may not be entirely indicative of the historical events that actually took place there. Using an ethnoarchaeological comparison, he looked at how hunters amongst the Nunamiut Iñupiat of north central Alaska spent a great deal of time in a certain area simply waiting for prey to arrive there, and that during this period, they undertook other tasks to pass
3927-661: The identification of archaeological sites across a large area, whereas intensive surveys are designed to provide a more comprehensive picture of the location of sites and the nature of off-site data (e.g. field systems , isolated finds, etc.). An intensive survey is the more costly, timely, and ultimately informative of the two approaches, although extensive surveys can provide important information about previously unknown areas. Archaeological field surveys can also be characterized as either purposive or sampling surveys. The former, sometimes also called " archaeological prospection ", involves cases where archaeologists are searching for
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#17328017920624004-454: The imperfect detection abilities of human observers, bring into question the very concept of complete coverage. An extensive survey , on the other hand, is characterised by a low-resolution approach over targets within a study area (sometimes including hundreds of km²). Sometimes this involves a random sampling or some other kind of probability sample to gain a representative sample of the study area. Extensive surveys may be designed to target
4081-417: The internet for open access and use by the public and archaeological researchers. Digital imaging or digital image acquisition is digital photography , such as of a physical scene or of the interior structure of an object. The term is often used to include the processing, compression, storage, printing, and display of the images. Finds and artifacts that survive in the archaeological record are retrieved in
4158-426: The limits of accuracy and precision necessary for survey work. Recording the position and attributes of archaeological features has been expedited by customizable portable computing interfaces or mobile Geographical Information Systems ( GIS ). Databases containing existing regional archaeological data as well as other landscape GIS layers such as soils, vegetation, modern features, and development plans can be loaded on
4235-446: The main by hand and observation as the context they survive in is excavated. Several other techniques are available depending on suitability and time constraints. Sieving (screening) and flotation are used to maximize the recovery of small items such as small shards of pottery or flint flakes, or bones and seeds. Flotation is a process of retrieval that works by passing spoil onto the surface of water and separating finds that float from
4312-448: The modern landscape interfered with the visibility of archaeological remains; what sorts of activities can be recognized (e.g., dwellings, tombs, field systems); how many people lived in this area at any given time or how did population density change over time; why did people choose to live where they did; how has the landscape changed over time; what changes in settlement patterns have there been? However, answering such questions depends on
4389-442: The need to survey areas where, for geological or other reasons, we can reasonably expect all ancient traces to be destroyed (e.g., by erosion) or far too deeply buried (e.g., by alluvium) to be detectable. Modern predictive models in archaeology employ Geographic Information Systems (GIS). A geophysical survey is used for subsurface mapping of archaeological sites. In recent years, there have been great advances in this field, and it
4466-491: The needs of the survey team (and the risk of destroying archaeological evidence if intrusive methods are used) and; (b) extensive or intensive , depending on the types of research questions being asked of the landscape in question. Surveys can be a practical way to decide whether or not to carry out an excavation (as a way of recording the basic details of a possible site), but may also be ends in themselves, as they produce important information about past human activities in
4543-660: The past. Meticulous and methodical archaeological excavation took over from antiquarian barrow-digging around the early to mid-nineteenth century and is still being perfected today. The most dramatic change that occurred over time is the amount of recording and care taken to ensure preservation of artifacts and features. In the past, archaeological excavation involved random digging to unearth artifacts. Exact locations of artifacts were not recorded, and measurements were not taken. Modern archaeological excavation has evolved to include removal of thin layers of sediment sequentially and recording of measurements about artifacts' locations in
4620-653: The patterning of non-excavated parts of the site. Unlike other archaeological methods, geophysical survey is not invasive or destructive. For this reason, it is often used where preservation (rather than excavation) is the goal for project preservation and compliance with applicable laws. The geophysical methods most commonly applied to archaeology are magnetometers , electrical resistance meters, ground-penetrating radar (GPR) and electromagnetic (EM) conductivity. These methods provide excellent resolution of many types of archaeological features, and are capable of high sample density surveys of very large areas and of operating under
4697-436: The phase in the strata, for example modern pipework or the 16th-century bottles left by treasure-hunters at Sutton Hoo . Excavation initially involves the removal of any topsoil . A strategy for sampling the contexts and features is formulated which may involve total excavation of each feature or only portions. In stratigraphic excavation, the goal is to remove some or, preferably, all archaeological deposits and features in
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#17328017920624774-507: The plateau and upper scarp or valley side soils will move down slope, forming a deep seal over low-lying archaeological deposits, rendering them inaccessible to surface survey. Even artifacts on the surface and with relatively high visibility (i.e., little obscuring vegetation), however, are not consistently detected by surveyors. Consequently, it is unrealistic to expect 100% recovery of artifacts or even sites. We can evaluate surveyors' effectiveness at detecting artifacts with "Sweep width," which
4851-449: The property owner. In a non-intrusive survey, nothing is touched, just recorded. An accurate survey of the earthworks and other features can enable them to be interpreted without the need for excavation . An intrusive survey can mean different things. In some cases, all artifacts of archaeological value are collected. This is often the case if it is a rescue survey, but less common in a regular survey. Another form of intrusive research
4928-402: The quality of the evidence, which is why it is important to evaluate the effectiveness and thoroughness of the survey or surveys that contribute that evidence. At times, one part of the survey may not have yielded the evidence one wanted to find. For instance, very little may have been found during a field walk, but there are strong indications from geophysical survey and local stories that there
5005-411: The reverse order they were created and construct a Harris matrix as a chronological record or "sequence" of the site. This Harris matrix is used for interpretation and combining contexts into ever larger units of understanding. This stratigraphic removal of the site is crucial for understanding the chronology of events on site. Stratigraphic excavation involves a process of cleaning or "troweling back"
5082-426: The sequence" before other contexts that have a latter physical stratigraphic relationship to them as defined by the law of superposition . The process of interpretation in practice will have a bearing on excavation strategies on site so "phasing" a site is actively pursued during excavation where at all possible and is considered good practice. An "intrusion" or " intrusive object " is something that arrived later to
5159-436: The site itself such as post molds, burials, and hearths), ecofacts (evidence of human activity through organic remains such as animal bones, pollen, or charcoal), and archaeological context (relationships among the other types of data). Before excavating, the presence or absence of archaeological remains can often be suggested by, non-intrusive remote sensing , such as ground-penetrating radar . Basic information about
5236-417: The soil processed through methods such as mechanical sieving or water flotation. Afterwards, digital methods are then used record the excavation process and its results. Ideally, data from the excavation should suffice to reconstruct the site completely in three-dimensional space. The first instance of archaeological excavation took place in the sixth century BC when Nabonidus , the king of Babylon, excavated
5313-440: The spoil which sinks. This is especially suited to the recovery of environmental data stored in organic material such as seeds and small bones. Not all finds retrieval is done during excavation and some, especially flotation, may take place post-excavation from samples taken during excavation. The use of sieving (screening) is more common on research-based excavations where more time is available. Some success has been achieved with
5390-404: The surface of the site and isolating contexts and edges which are definable as either: Following this preliminary process of defining the context, it is then recorded and removed. Often, owing to practical considerations or error, the process of defining the edges of contexts is not followed and contexts are removed out of sequence and un-stratigraphically. This is called "digging out of phase". It
5467-403: The surface. Even with optimal surface conditions the efficacy of fieldwalking varies according to long-term land use, topography, weather conditions, the skill and experience of the fieldwalkers, and other factors. Intensive arable agriculture on hilltops will first expose and then pulverize artifacts such as pottery and even chipped stone (typically flint, chert or obsidian) flakes. Conversely,
5544-471: The time, such as the carving of various objects, including a wooden mould for a mask, a horn spoon and an ivory needle, as well as repairing a skin pouch and a pair of caribou skin socks. Binford notes that all of these activities would have left evidence in the archaeological record, but that none of them would provide evidence for the primary reason that the hunters were in the area; to wait for prey. As he remarked, waiting for animals to hunt "represented 24% of
5621-439: The total man-hours of activity recorded; yet there is no recognisable archaeological consequences of this behaviour. No tools left on the site were used, and there were no immediate material "byproducts" of the "primary" activity. All of the other activities conducted at the site were essentially boredom reducers." In archaeology, especially in excavating, stratigraphy involves the study of how deposits occurs layer by layer. It
5698-416: The use of cement mixers and bulk sieving. This method allows the quick removal of context by shovel and mattock yet allows for a high retrieval rate. Spoil is shoveled into cement mixers and water added to form a slurry which is then poured through a large screen mesh. The speed of this technique is offset by the damage it does to more fragile artifacts. One important role of finds retrieval during excavation
5775-412: The validity of the working hypothesis on the phasing of site during excavation. For example, the presence of an anomalous medieval pottery sherd in what was thought to be an Iron Age ditch feature could radically alter onsite thinking on the correct strategy for digging a site and save a lot of information being lost due to incorrect assumptions about the nature of the deposits which will be destroyed by
5852-513: The vegetation and landscape to decide what may be hidden under the vegetation, or survey by subsurface testing (SST). SSTs can consist of a series of shovel-test pits that penetrate the humus layer or turf or, where substantial later sediments may cover archaeological materials, series of auger or core holes. SSTs are much more costly than fieldwalking, and surveys by SST usually have very low probability of intersecting and detecting archaeological remains unless intensity (density of SSTs), and thus cost,
5929-406: Was located near. Context is important for determining how long ago the artifact or feature was in use as well as what its function may have been. The cutting of a pit or ditch in the past is a context, whilst the material filling it will be another. Multiple fills seen in section would mean multiple contexts. Structural features, natural deposits and inhumations are also contexts. By separating
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