Dating refers to the archaeological tool to date artefacts and sites, and to properly construct history. Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable. This method includes carbon dating and thermoluminescence. The first method was based on radioactive elements whose property of decay occurs at a constant rate, known as the half-life of the isotope. Today, many different radioactive elements have been used, but the most famous absolute dating method is radiocarbon dating, which uses the isotope 14 C.
Luckily, there exist good methods to do so. The earliest method of dating artifacts is to look at which strata of rock they are found within. To accurately determine this, each layer of soil must be removed, a process known as extraction, during the archaeological dig.
The business of archeology is done in an extremely careful manner in order to provide the most accurate results; this is often very time consuming and can last days, months, or even years. Over the years, archaeologists have compiled their findings into large databases containing information about the types of artifacts that correspond with difference civilizations, and the types of soil in which they usually found.
Another method for dating artifacts is called typologywhich simply means the study of types. In typology, a researcher studies the material of an artifact, its form, and its most likely purpose. Due to technological necessity, more complex artifacts are newer than simpler artifacts, so often an artifact can be dated simply by looking the materials and process used to make it.
If the artifact is from a civilization that possessed written records, dating is even easier because there are existing textual clues as to which artifacts were produced during which eras. One of the most commonly used methods of artifact dating is carbon dating, also known as radiocarbon dating.
This method only works to date organisms that were once alive no more than 58, to 62, years ago. By dating an organism sample found near the original found artifact, archaeologists can learn information about the artifact's time period and history.
Organisms take in carbon naturally while they are alive, but when they die, they stop absorbing it. Carbon has a half-life of 5, years, so it slowly decays and its frequency declines as the organic material is buried. Determining the exact quantity of carbon in a sample can give a very close approximation of the corresponding artifact's creation date.
How long would it take to date an artifact? I do believe that question is still unanswered. Do you know where I could go or how long it would take? The idea is the same as carbon 14 dating but instead of looking for carbon in artifacts, archaeologists look for potassium and argon.
They are able to determine age of artifacts with this because the potassium in artifacts slowly turn into argon over time. So based on how much potassium and argon an artifact has, archaeologists can figure out how young or old it is. If the proportion of potassium is higher for example, it is a younger artifact. And if the proportion of argon is higher, it is an older artifact. Is it not possible since carbon dating cannot go back that long? My teacher said that each ring stands for one year and archaeologists just count the rings and that gives a good estimate of how many years that tree has existed for.
I really like this method, it sounds really easy and straightforward. I think even those who are not archaeologists could use this method to learn about the age of a forest, for example. SauteePan Post 2 I think that it is amazing how they find these archeology artifacts and are able to pinpoint a timeline of when they existed. I think that it is so interesting how they were able to classify dinosaurs within their respective eras.
Most dinosaurs for example, lived millions of years ago and to me it is fascinating how they could have such exact information regarding what they looked like based on a collection of bones that they uncovered. I would be terrified to touch any one of those bones because I would hate for one of them to break.
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Different methods of dating artifacts
Balter, Michael. Guilderson, Tom P. Turney, Chris S. Cite this article Pick a style below, and copy the text for your bibliography. April 28, Retrieved April 28, from Encyclopedia.
Then, copy and paste the text into your bibliography or works cited list. Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia. Dating techniques are procedures used by scientists to determine the age of a specimen.
Relative dating methods tell only if one sample is older or younger than another sample; absolute dating methods provide a date in years.
Many absolute dating techniques take advantage of radioactive decaywhereby a radioactive form of an element is converted into another radioactive isotope or non-radioactive product at a regular rate. In recent years, a few of these methods have undergone continual refinement as scientists strive to develop the most accurate dating techniques possible.
It is based on the assumption which, except at unconformitiesnearly always holds true that deeper layers were deposited earlier, and thus are older than more shallow layers. Although these units may be sequential, they are not necessarily continuous due to erosional removal of some intervening units.
The technique works best if the animals belonged to species that evolved quickly, expanded rapidly over a large area, or suffered a mass extinction. This process results in a "rain" of pollen that falls over many types of environments. In most cases, this also reveals much about the climate of the period, because most plants only thrive in specific climatic conditions. This dating technique of amino acid racimization was first conducted by Hare and Mitterer inand was popular in the s.
Amino acid racimization is based on the principle that amino acids except glycine, a very simple amino acid exist in two mirror image forms called stereoisomers. This may form a D-amino acid instead of an L - amino acid. The rate at which the reaction occurs is different for each amino acid; in addition, it depends upon the moisture, temperatureand pH of the postmortem conditions.
It can be used to obtain dates that would be unobtainable by more conventional methods such as radiocarbon dating. Although cation-ratio dating has been widely used, recent studies suggest it has potential errors. Thermoluminescence dating is very useful for determining the age of pottery. This radiation may come from radioactive substances such as uranium. The longer the radiation exposure, the more electrons get bumped into an excited state.
With more electrons in an excited state, more light is emitted upon heating. Scientists can determine how many years have passed since a ceramic was fired by heating it in the laboratory and measuring how much light is given off. Optically stimulated luminescence OSL has only been used since It is very similar to thermoluminescence dating, both of which are considered "clock setting" techniques.
To determine the age of sediment, scientists expose grains to a known amount of light and compare these grains with the unknown sediment. A disadvantage to this technique is that in order to get accurate results, the sediment to be tested cannot be exposed to light which would reset the "clock"making sampling difficult. The absolute dating method utilizing tree ring growth is known as dendrochronology. Dendrochronology has a range of one to 10, years or more.
As previously mentioned, radioactive decay refers to the process in which a radioactive form of an element is converted into a decay product at a regular rate. Potassium-argon dating relies on the fact that when volcanic rocks are heated to extremely high temperatures, they release any argon gas trapped in them. Radiocarbon dating is used to date charcoal, wood, and other biological materials. The range of conventional radiocarbon dating is 30, - 40, years, but with sensitive instrumentation, this range can be extended to 70, years.
Relative to their atmospheric proportions, atoms of 14 C and of a non-radioactive form of carbon, 12 C, are equally likely to be incorporated into living organisms. This allows them to determine how much 14 C has formed since the death of the organism.
One of the most familiar applications of radioactive dating is determining the age of fossilized remains, such as dinosaur bones. Radioactive dating is also used to authenticate the age of rare archaeological artifacts. Because items such as paper documents and cotton garments are produced from plants, they can be dated using radiocarbon dating.
Without radioactive datinga clever forgery might be indistinguishable from a real artifact. There are some limitations, however, to the use of this technique. Samples that were heated or irradiated at some time may yield by radioactive dating an age less than the true age of the object. Because of this limitation, other dating techniques are often used along with radioactive dating to ensure accuracy.
Uranium series dating techniques rely on the fact that radioactive uranium and thorium isotopes decay into a series of unstable, radioactive "daughter" isotopes; this process continues until a stable non-radioactive lead isotope is formed. The "parent" isotopes have half-lives of several billion years. Uranium series have been used to date uranium-rich rocks, deep-sea sediments, shells, bones, and teeth, and to calculate the ages of ancient lakebeds.
The decay rate is measured in terms dating the half-life of the element, or the time it takes for half different the element to dating into different daughter atoms. The half-life of U is 4. When the different or glass is heated, the tracks are erased in much the same way cut artifacts fade away from artifacts candy that is heated. Different methods of dating artifacts - Register and search over 40 million singles: chat. Rich man looking for older woman & younger man. I'm laid back and get along with everyone. Looking for an old soul like myself. I'm a woman. My interests include staying up late and taking naps. Join the leader in online dating services and find a date today. Relative dating determines the age of artifacts or site, as older or younger or the same age as others, but does not produce precise dates. Absolute dating, methods that produce specific chronological dates for objects and occupations, was not available to archaeology until well into the 20th century.
In the case of daughter excess, a larger amount of the daughter is initially deposited than the parent. Some volcanic minerals and glasses, such as obsidiancontain uranium U. Over time, these substances become "scratched. When an atom of U splits, two "daughter" atoms rocket away from each other, leaving in their wake tracks in the material in which they are embedded.
Although certain dating techniques are accurate only within certain age ranges, whenever possible, scientists attempt to use multiple methods to date specimens.
Correlation of dates via different dating methods provides a highest degree of confidence in dating. See also Evolution, evidence of; Fossil record; Fossils and fossilization; Geologic time; Historical geology. Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide a date in years. Many absolute dating techniques take advantage of radioactive decaywhereby a radioactive form of an element is converted into a non-radioactive product at a regular rate.
The technique works best if the animals belonged to species which evolved quickly, expanded rapidly over a large area, or suffered a mass extinction. Pollen that ends up in lake beds or peat bogs is the most likely to be preserved, but pollen may also become fossilized in arid conditions if the soil is acidic or cool. The varnish contains cations, which are positivelycharged atoms or molecules.
Different Methods Of Dating Artifacts - Dating Rocks and Fossils Using Geologic Methods
This radiation may come from radioactive substances such as uraniumpresent in the clay or burial medium, or from cosmic radiation. Thermoluminescence dating has the advantage of covering the time interval between radiocarbon and potassium-argon datingor 40,- years. As the rocks cool, argon 40Ar begins to accumulate.
Argon is formed in the rocks by the radioactive decay of potassium 40K. The amount of 40Ar formed is proportional to the decay rate half-life of 40K, which is 1. The reason such old material is required is that it takes a very long time to accumulate enough 40Ar to be measured accurately.
The range of conventional radiocarbon dating is 30, years, but with sensitive instrumentation this range can be extended to 70, years. Radiocarbon 14C is a radioactive form of the element carbon.
It decays spontaneously into nitrogen 14N. Atoms of 14C and of a non-radioactive form of carbon, 12C, are equally likely to be incorporated into living organisms-there is no discrimination.
The ratio will then begin to change as the 14C in the dead organism decays into 14N. This is the time required for half of the 14C to decay into 14N. The half-life of 14C is 5, years. This allows us to determine how much 14C has formed since the death of the organism. The "parent" isotopes have half-lives of several thousand million years.
Mar 09, If the artifact is from a civilization that possessed written records, dating is even easier because there are existing textual clues as to which artifacts were produced during which eras. Carbon Dating. One of the most commonly used methods of artifact dating is carbon dating, also known as radiocarbon dating. This method only works to.
Geyh, Mebus A. Absolute Age Determination. New York : Springer-Verlag, Oberhofer, and D. Regulla, eds. Scientific Dating Methods. Boston: Kluwer Academic Publishers, Lewis, C. Fission-Track Dating. Movies and television have presented a romantic vision of archaeology as adventure in far-away and exotic locations.
A more realistic picture might show researchers digging in smelly mud for hours under the hot sun while battling relentless mosquitoes. This type of archaeological research produces hundreds of small plastic bags containing pottery shards, animal bones, bits of worked stone, and other fragments. These findings must be classified, which requires more hours of tedious work in a stuffy tent. At its best, archaeology involves a studious examination of the past with the goal of learning important information about the culture and customs of ancient or not so ancient peoples.
Much archaeology in the early twenty-first century investigates the recent past, a sub-branch called "historical archaeology. Archaeology is the study of the material remains of past human cultures. It is distinguished from other forms of inquiry by its method of study, excavation. Most archaeologists call this "digging. That sort of unscientific digging destroys the archaeological information.
Archaeological excavation requires the removal of material layer by layer to expose artifacts in place. The removed material is carefully sifted to find small artifactstiny animal bones, and other remains. Archaeologists even examine the soil in various layers for microscopic material, such as pollen. Excavations, in combination with surveys, may yield maps of a ruin or collections of artifacts. Time is important to archaeologists. There is rarely enough time to complete the work, but of even greater interest is the time that has passed since the artifact was created.
An important part of archaeology is the examination of how cultures change over time. It is therefore essential that the archaeologist is able to establish the age of the artifacts or other material remains and arrange them in a chronological sequence. The archaeologist must be able to distinguish between objects that were made at the same time and objects that were made at different times. When objects that were made at different times are excavated, the archaeologist must be able to arrange them in a sequence from the oldest to the most recent.
Before scientific dating techniques such as dendrochronology and radiocarbon dating were introduced to archaeology, the discipline was dominated by extensive discussions of the chronological sequence of events. Most of those questions have now been settled and archaeologists have moved on to other issues. Scientific dating techniques have had a huge impact on archaeology. Archaeologists use many different techniques to determine the age of an object.
Usually, several different techniques are applied to the same object. Relative dating arranges artifacts in a chronological sequence from oldest to most recent without reference to the actual date. For example, by studying the decorations used on pottery, the types of materials used in the pottery, and the types and shapes of pots, it is often possible to arrange them into a sequence without knowing the actual date. In absolute datingthe age of an object is determined by some chemical or physical process without reference to a chronology.
Relative Dating Methods. The most common and widely used relative dating technique is stratigraphy. The principle of superposition borrowed from geology states that higher layers must be deposited on top of lower layers. Thus, higher layers are more recent than lower layers. This only applies to undisturbed deposits. Rodent burrows, root action, and human activity can mix layers in a process known as bioturbation.
However, the archaeologist can detect bioturbation and allow for its effects. Discrete layers of occupation can often be determined. For example, Hisarlik, which is a hill in Turkeyis thought by some archaeologists to be the site of the ancient city of Troy. However, Hisarlik was occupied by many different cultures at various times both before and after the time of Troy, and each culture built on top of the ruins of the previous culture, often after violent conquest.
Consequently, the layers in this famous archaeological site represent many different cultures. An early excavator of Hisarlik, Heinrich Schleimann, inadvertently dug through the Troy layer into an earlier occupation and mistakenly assigned the gold artifacts he found there to Troy. Other sites have been continuously occupied by the same culture for a long time and the different layers represent gradual changes.
In both cases, stratigraphy will apply. A chronology based on stratigraphy often can be correlated to layers in other nearby sites. For example, a particular type or pattern of pottery may occur in only one layer in an excavation. If the same pottery type is found in another excavation nearby, it is safe to assume that the layers are the same age.
Archaeologists rarely make these determinations on the basis of a single example. Usually, a set of related artifacts is used to determine the age of a layer. Seriation simply means ordering. This technique was developed by the inventor of modern archaeology, Sir William Matthew Flinders Petrie. Seriation is based on the assumption that cultural characteristics change over time. For example, consider how automobiles have changed in the last 50 years a relatively short time in archaeology.
Automobile manufacturers frequently introduce new styles about every year, so archaeologists thousands of years from now will have no difficulty identifying the precise date of a layer if the layer contains automobile parts. Cultural characteristics tend to show a particular pattern over time. The characteristic is introduced into the culture for example, using a certain type of projectile point for hunting or wearing low-riding jeansbecomes progressively more popular, then gradually wanes in popularity.
The method of seriation uses this distinctive pattern to arrange archaeological materials into a sequence. However, seriation only works when variations in a cultural characteristic are due to rapid and significant change over time. It also works best when a characteristic is widely shared among many different members of a group. Even then, it can only be applied to a small geographic area, because there is also geographic variation in cultural characteristics.
For example, 50 years ago American automobiles changed every year while the Volkswagen Beetle hardly changed at all from year to year.
Cross dating is also based on stratigraphy. It uses the principle that different archaeological sites will show a similar collection of artifacts in layers of the same age.
Sir Flinders Petrie used this method to establish the time sequence of artifacts in Egyptian cemeteries by identifying which burials contained Greek pottery vessels. These same Greek pottery styles could be associated with monuments in Greece whose construction dates were fairly well known. Since absolute dating techniques have become common, the use of cross dating has decreased significantly. Pollen grains also appear in archaeological layers.
They are abundant and they survive very well in archaeological contexts. As climates change over time, the plants that grow in a region change as well. People who examine pollen grains the study of which is known as pollen analysis can usually determine the genusand often the exact species producing a certain pollen type.
Archaeologists can then use this information to determine the relative ages of some sites and layers within sites. However, climates do not change rapidly, so this type of analysis is best for archaeological sites dating back to the last ice age. Absolute Dating Methods. Absolute dating methods produce an actual date, usually accurate to within a few years. This date is established independent of stratigraphy and chronology. If a date for a certain layer in an excavation can be established using an absolute dating method, other artifacts in the same layer can safely be assigned the same age.
Dendrochronology, also known as tree-ring dating, is the earliest form of absolute dating. This method was first developed by the American astronomer Andrew Ellicott Douglas at the University of Arizona in the early s. Douglas was trying to develop a correlation between climate variations and sunspot activitybut archaeologists quickly recognized its usefulness as a dating tool.
The technique was first applied in the American Southwest and later extended to other parts of the world. Tree-ring dating is relatively simple. Trees add a new layer of cambium the layer right under the bark every year. The thickness of the layer depends on local weather and climate. In years with plenty of rain, the layer will be thick and healthy.
Over the lifetime of the tree, these rings accumulate, and the rings form a record of regional variation in climate that may extend back hundreds of years.
Since all of the trees in a region experience the same climate variations, they will have similar growth patterns and similar tree ring patterns. One tree usually does not cover a period sufficiently long to be archaeologically useful.
However, patterns of tree ring growth have been built up by "overlapping" ring sequences from different trees so that the tree ring record extends back several thousand years in many parts of the world.
Dating techniques are procedures used by scientists to determine the age of rocks, fossils, or artifacts. Relative dating methods tell only if one sample is older or younger than another; absolute dating methods provide an approximate date in years. The latter have generally been available only since Many absolute dating techniques take. Mar 17, Dating refers to the archaeological tool to date artefacts and sites, and to properly construct history. All methods can be classified into two basic categories: a) Relative dating methods: Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological saporiviafrancigena.com: Johnblack. Jun 28, How archaeologists determine the date of ancient sites and artifacts From radiocarbon dating to comparing designs across the ages, archaeologists gather clues to calculate the age of artifacts. 3.
The process starts with examination of the growth ring patterns of samples from living trees. Then older trees are added to the sequence by overlapping the inner rings of a younger sample with the outer rings of an older sample. Older trees are recovered from old buildings, archaeological sites, peat bogs, and swamps.
Eventually, a regional master chronology is constructed. When dendrochronology can be used, it provides the most accurate dates of any technique.
In the American Southwest, the accuracy and precision of dendrochronology has enabled the development of one of the most. Often events can be dated to within a decade. This precision has allowed archaeologists working in the American Southwest to reconstruct patterns of village growth and subsequent abandonment with a fineness of detail unmatched in most of the world. Radiometric dating methods are more recent than dendrochronology. However, dendrochronology provides an important calibration technique for radiocarbon dating techniques.
All radiometric-dating techniques are based on the well-established principle from physics that large samples of radioactive isotopes decay at precisely known rates. The rate of decay of a radioactive isotope is usually given by its half-life. The decay of any individual nucleus is completely random. The half-life is a measure of the probability that a given atom will decay in a certain time. The shorter the half-life, the more likely the atom will decay.
Absolute dating methods (ANT)
This probability does not increase with time. If an atom has not decayed, the probability that it will decay in the future remains exactly the same. This means that no matter how many atoms are in a sample, approximately one-half will decay in one half-life. The remaining atoms have exactly the same decay probability, so in another half-life, one half of the remaining atoms will decay. The amount of time required for one-half of a radioactive sample to decay can be precisely determined.
The particular radioisotope used to determine the age of an object depends on the type of object and its age. Radiocarbon is the most common and best known of radiometric dating techniques, but it is also possibly the most misunderstood. It was developed at the University of Chicago in by a group of American scientists led by Willard F. Radiocarbon dating has had an enormous impact on archaeology. In the last 50 years, radiocarbon dating has provided the basis for a worldwide cultural chronology.
Recognizing the importance of this technique, the Nobel Prize committee awarded the Prize in Chemistry to Libby in The physics behind radiocarbon dating is straightforward. Earth 's atmosphere is constantly bombarded with cosmic rays from outer space. Cosmic-ray neutrons collide with atoms of nitrogen in the upper atmosphere, converting them to atoms of radioactive carbon The carbon atom quickly combines with an oxygen molecule to form carbon dioxide.
This radioactive carbon dioxide spreads throughout Earth's atmosphere, where it is taken up by plants along with normal carbon As long as the plant is alive, the relative amount ratio of carbon to carbon remains constant at about one carbon atom for every one trillion carbon atoms. Some animals eat plants and other animals eat the plant-eaters. As long as they are alive, all living organisms have the same ratio of carbon to carbon as in the atmosphere because the radioactive carbon is continually replenished, either through photosynthesis or through the food animals eat.
However, when the plant or animal dies, the intake of carbon stops and the ratio of carbon to carbon immediately starts to decrease. The half-life of carbon is 5, years. After 5, years, about one-half of the carbon atoms will have decayed. After another 5, years, one-half of the remaining atoms will have decayed.
So after 11, years, only one-fourth will remain. After 17, years, one-eighth of the original carbon will remain. After 22, years, one-sixteenth will remain. Radiocarbon dating has become the standard technique for determining the age of organic remains those remains that contain carbon. There are many factors that must be taken into account when determining the age of an object.
The best objects are bits of charcoal that have been preserved in completely dry environments. The worst candidates are bits of wood that have been saturated with sea water, since sea water contains dissolved atmospheric carbon dioxide that may throw off the results. Radiocarbon dating can be used for small bits of clothing or other fabric, bits of bone, baskets, or anything that contains organic material. There are well over labs worldwide that do radiocarbon dating.
In the early twenty-first century, the dating of objects up to about 10 half-lives, or up to about 50, years old, is possible. However, objects less than years old cannot be reliably dated because of the widespread burning of fossil fuels, which began in the nineteenth century, and the production of carbon from atmospheric testing of nuclear weapons in the s and s.
Another problem with radiocarbon dating is that the production of carbon in the atmosphere has not been constant, due to variation in solar activity. For example, in the s, solar activity dropped a phenomenon called the "Maunder Minimum"so carbon production also decreased during this period.
To achieve the highest level of accuracy, carbon dates must be calibrated by comparison to dates obtained from dendrochronology. Calibration of Radiocarbon Dates. Samples of Bristlecone pine, a tree with a very long life span, have been dated using both dendrochronology and radiocarbon dating. The results do not agree, but the differences are consistent. That is, the radiocarbon dates were always wrong by the same number of years.
Consequently, tree-ring chronologies have been used to calibrate radiocarbon dates to around 12, years ago. When radiocarbon dating was first put into use, it was decided that dates would always be reported as B. That way, dates reported in magazine articles and books do not have to be adjusted as the years pass. So if a lab determines that an object has a radiocarbon age of 1, years inits age will be given as B. Calibrated dates are given using the actual date, such as c.
Potassium-Argon Dating. If an object is too old to be dated by radiocarbon dating, or if it contains no organic material, other methods must be used. One of these is potassium-argon dating. All naturally occurring rocks contain potassium. Some of the potassium in rocks is the radioactive isotope potassium Potassium gradually decays to the stable isotope argon, which is a gas.
When the rock is melted, as in a volcano, any argon gas trapped in the rock escapes. When the rock cools, the argon will begin to build up.
So this method can be used to measure the age of any volcanic rock, fromyears up to around 5 billion years old. This method is not widely used in archaeology, since most archaeological deposits are not associated with volcanic activity.
However, Louis and Mary Leakey successfully used the method to determine the ages of fossils in Olduvai Gorge in Tanzania by examining rocks from lava flows above and below the fossils. They were able to establish an absolute chronology for humans and human ancestors extending back two million years. At Laetolli, in Tanzania, volcanic ash containing early hominid footprints was dated by this method at 3. Other Methods. Uranium is present in most rocks.
This isotope of uranium spontaneously undergoes fission. The fission fragments have a lot of energy, and they plow through the rock, leaving a track that can be made visible by treating the rock. So by counting fission tracks, the age of the rock can be determined. Like potassium-argon datingthis can only be used to determine the age of the rock, not the age of the artifact itself. Thermoluminescence is a recently developed technique that uses the property of some crystals to "store" light.
Sometimes an electron will be knocked out of its position in a crystal and will "stick" somewhere else in the crystal.
These displaced electrons will accumulate over time. If the sample is heated, the electrons will fall back to their normal positions, emitting a small flash of light. By measuring the light emitted, the time that has passed since the artifact was heated can be determined. This method should prove to be especially useful in determining the age of ceramics, rocks that have been used to build fire rings, and samples of chert and flint that have been deliberately heated to make them easier to flake into a projectile point.
Science continues to develop new methods to determine the age of objects. As our knowledge of past chronologies improves, archaeologists will be better able to understand how cultures change over time, and how different cultures interact with each other. As a result, this knowledge will enable us to achieve a progressively better understanding of our own culture.
Baillie, M. London U. Taylor, R. Radiocarbon Dating : An Archaeological Perspective. Orlando, FL: Academic Press, Long, and R. Wood, Michael. In Search of the Trojan War.