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Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.

The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon (14
C
) is constantly being created in the Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14
C
combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire 14
C
by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of 14
C
it contains begins to decrease as the 14
C
undergoes radioactive decay. Measuring the amount of 14
C
in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to calculate when the animal or plant died. The older a sample is, the less 14
C
there is to be detected, and because the half-life of 14
C
(the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to approximately 50,000 years ago, although special preparation methods occasionally make an accurate analysis of older samples possible. Libby received the Nobel Prize in Chemistry for his work in 1960.

Research has been ongoing since the 1960s to determine what the proportion of 14
C
in the atmosphere has been over the past fifty thousand years. The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age. Other corrections must be made to account for the proportion of 14
C
in different types of organisms (fractionation), and the varying levels of 14
C
throughout the biosphere (reservoir effects). Additional complications come from the burning of fossil fuels such as coal and oil, and from the above-ground nuclear tests done in the 1950s and 1960s. Because the time it takes to convert biological materials to fossil fuels is substantially longer than the time it takes for its 14
C
to decay below detectable levels, fossil fuels contain almost no 14
C
. As a result, beginning in the late 19th century, there was a noticeable drop in the proportion of 14
C
as the carbon dioxide generated from burning fossil fuels began to accumulate in the atmosphere. Conversely, nuclear testing increased the amount of 14
C
in the atmosphere, which reached a maximum in about 1965 of almost double the amount present in the atmosphere prior to nuclear testing.

Measurement of radiocarbon was originally done by beta-counting devices, which counted the amount of beta radiation emitted by decaying 14
C
atoms in a sample. More recently, accelerator mass spectrometry has become the method of choice; it counts all the 14
C
atoms in the sample and not just the few that happen to decay during the measurements; it can therefore be used with much smaller samples (as small as individual plant seeds), and gives results much more quickly. The development of radiocarbon dating has had a profound impact on archaeology. In addition to permitting more accurate dating within archaeological sites than previous methods, it allows comparison of dates of events across great distances. Histories of archaeology often refer to its impact as the "radiocarbon revolution". Radiocarbon dating has allowed key transitions in prehistory to be dated, such as the end of the last ice age, and the beginning of the Neolithic and Bronze Age in different regions. (Full article...)
The Alepotrypa Cave is an archaeological site in the Mani region of the Peloponnese peninsula. In addition to being inhabited by early farmers, this site was used for burial and cult purposes. Archaeological evidence has revealed that this is one of the largest Neolithic burial sites ever found in Europe. Two adult human skeletons were found at the site from a burial dating to the 4th millennium BC, as well as remains from at least 170 separate persons. Archaeologists are uncertain about the significance of a Mycenaen ossuary, which has been dated to the 2nd millennium BC and appears to have been reburied at Alepotrypa. While there is no direct evidence, it is possible that the ossuary may link Alepotrypa to Tainaron, which was regarded as the entrance to Hades in classical mythology. (Full article...)

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Iximcheʼ (/iʃimˈtʃeʔ/) (or Iximché using Spanish orthography) is a Pre-Columbian Mesoamerican archaeological site in the western highlands of Guatemala. Iximche was the capital of the Late Postclassic Kaqchikel Maya kingdom from 1470 until its abandonment in 1524. The architecture of the site included a number of pyramid-temples, palaces and two Mesoamerican ballcourts. Excavators uncovered the poorly preserved remains of painted murals on some of the buildings and ample evidence of human sacrifice. The ruins of Iximche were declared a Guatemalan National Monument in the 1960s. The site has a small museum displaying a number of pieces found there, including sculptures and ceramics. It is open daily.

For many years the Kaqchikel served as loyal allies of the Kʼicheʼ Maya. The growing power of the Kaqchikel within the alliance eventually caused such friction that the Kaqchikel were forced to flee the Kʼicheʼ capital and founded the city of Iximche. The Kaqchikel established their new capital upon an easily defensible ridge almost surrounded by deep ravines. Iximche developed quickly as a city and within 50 years of its foundation it had reached its maximum extent. The rulers of Iximche were four principal lords drawn from the four main clans of the Kaqchikel, although it was the lords of the Sotzʼil and Xahil clans who held the real power.

After the initial establishment of Iximche, the Kʼicheʼ left the Kaqchikel in peace for a number of years. The peace did not last and the Kaqchikel soundly defeated their former overlords around 1491. This was followed by infighting among the Kaqchikel clans with the rebel clans finally being overcome in 1493. Wars against the Kʼicheʼ continued throughout the early 16th century. When the Spanish conquistadors arrived in Mexico, the Aztec emperor sent messengers to warn the Kaqchikel. After the surrender of the Aztecs to Hernán Cortés, Iximche sent its own messengers to offer a Kaqchikel alliance with the Spanish. Smallpox decimated the population of Iximche before the physical arrival of the Europeans. At the time of the Spanish Conquest, Iximche was the second most important city in the Guatemalan Highlands, after the Kʼicheʼ capital at Qʼumarkaj. Conquistador Pedro de Alvarado was initially well received in the city in 1524 and the Kaqchikel kings provided the Spanish with native allies to assist in the conquest of the other highland Maya kingdoms. Iximche was declared the first capital of the Kingdom of Guatemala in the same year. Due to excessive Spanish demands for tribute, the Kaqchikel soon broke the alliance and deserted their capital, which was burned 2 years later by Spanish deserters. The Europeans founded a new town nearby but abandoned it in 1527 due to the continued hostility of the Kaqchikel, who finally surrendered in 1530.

The ruins of Iximche were first described by a Guatemalan historian in the late 17th century. They were visited various times by scholars during the 19th century, who published plans and descriptions. Serious investigations of the site started in the 1940s and continued sporadically until the early 1970s. In 1980, during the Guatemalan Civil War, a meeting took place at the ruins between guerillas and Maya leaders that resulted in the guerillas stating that they would defend indigenous rights. A ritual was carried out at the site in 1989 in order to reestablish the ruins as a sacred place for Maya ceremonies. United States President George W. Bush visited the site in 2007, and in the same year Iximche was the venue for the III Continental Summit of Indigenous Peoples and Nationalities of Abya Yala. (Full article...)

Iximcheʼ (/iʃimˈtʃeʔ/) (or Iximché using Spanish orthography) is a Pre-Columbian Mesoamerican archaeological site in the western highlands of Guatemala. Iximche was the capital of the Late Postclassic Kaqchikel Maya kingdom from 1470 until its abandonment in 1524. The architecture of the site included a number of pyramid-temples, palaces and two Mesoamerican ballcourts. Excavators uncovered the poorly preserved remains of painted murals on some of the buildings and ample evidence of human sacrifice. The ruins of Iximche were declared a Guatemalan National Monument in the 1960s. The site has a small museum displaying a number of pieces found there, including sculptures and ceramics. It is open daily.

For many years the Kaqchikel served as loyal allies of the Kʼicheʼ Maya. The growing power of the Kaqchikel within the alliance eventually caused such friction that the Kaqchikel were forced to flee the Kʼicheʼ capital and founded the city of Iximche. The Kaqchikel established their new capital upon an easily defensible ridge almost surrounded by deep ravines. Iximche developed quickly as a city and within 50 years of its foundation it had reached its maximum extent. The rulers of Iximche were four principal lords drawn from the four main clans of the Kaqchikel, although it was the lords of the Sotzʼil and Xahil clans who held the real power.

After the initial establishment of Iximche, the Kʼicheʼ left the Kaqchikel in peace for a number of years. The peace did not last and the Kaqchikel soundly defeated their former overlords around 1491. This was followed by infighting among the Kaqchikel clans with the rebel clans finally being overcome in 1493. Wars against the Kʼicheʼ continued throughout the early 16th century. When the Spanish conquistadors arrived in Mexico, the Aztec emperor sent messengers to warn the Kaqchikel. After the surrender of the Aztecs to Hernán Cortés, Iximche sent its own messengers to offer a Kaqchikel alliance with the Spanish. Smallpox decimated the population of Iximche before the physical arrival of the Europeans. At the time of the Spanish Conquest, Iximche was the second most important city in the Guatemalan Highlands, after the Kʼicheʼ capital at Qʼumarkaj. Conquistador Pedro de Alvarado was initially well received in the city in 1524 and the Kaqchikel kings provided the Spanish with native allies to assist in the conquest of the other highland Maya kingdoms. Iximche was declared the first capital of the Kingdom of Guatemala in the same year. Due to excessive Spanish demands for tribute, the Kaqchikel soon broke the alliance and deserted their capital, which was burned 2 years later by Spanish deserters. The Europeans founded a new town nearby but abandoned it in 1527 due to the continued hostility of the Kaqchikel, who finally surrendered in 1530.

The ruins of Iximche were first described by a Guatemalan historian in the late 17th century. They were visited various times by scholars during the 19th century, who published plans and descriptions. Serious investigations of the site started in the 1940s and continued sporadically until the early 1970s. In 1980, during the Guatemalan Civil War, a meeting took place at the ruins between guerillas and Maya leaders that resulted in the guerillas stating that they would defend indigenous rights. A ritual was carried out at the site in 1989 in order to reestablish the ruins as a sacred place for Maya ceremonies. United States President George W. Bush visited the site in 2007, and in the same year Iximche was the venue for the III Continental Summit of Indigenous Peoples and Nationalities of Abya Yala. (Full article...)

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Panagiotis Kavvadias or Cawadias (Greek: Παναγιώτης Καββαδίας; 14 May [O.S. 2 May] 1850 – 20 July 1928) was a Greek archaeologist. He was responsible for the excavation of ancient sites in Greece, including Epidaurus in Argolis and the Acropolis of Athens, as well as archaeological discoveries on his native island of Kephallonia. As Ephor General (the head of the Greek Archaeological Service) from 1885 until 1909, Kavvadias oversaw the expansion of the Archaeological Service and the introduction of Law 2646 of 1899, which increased the state's powers to address the illegal excavation and smuggling of antiquities.

Kavvadias's work had a particular impact on the Acropolis of Athens, and has been credited with completing its "transformation [...] from castle to monument". Between 1885 and 1890, he removed almost all of the Acropolis's remaining medieval and modern structures, uncovering many ancient monuments in the process. He also played a role in the extensive reconstruction of the site by the architect and engineer Nikolaos Balanos. Though praised initially, the work caused considerable damage to several monuments and was almost completely deconstructed and rebuilt during the later 20th and early 21st centuries. Kavvadias oversaw the opening of the National Archaeological Museum in Athens, organised its first collections, and wrote some of its first catalogues.

As an administrator, Kavvadias was regarded as energetic, centralising and autocratic. His career saw significant modernisation in the practice of archaeology in Greece, and he reformed and professionalised the Archaeological Service. His patronage of Athens's foreign archaeological schools was credited with promoting the development of Greek archaeology, but was also criticised by native Greek archaeologists. He created further discontent among the Archaeological Society of Athens by reducing its role in favour of the governmental Archaeological Service. After the Goudi coup of 1909, dissatisfaction in the Greek press and among his subordinates in the Archaeological Service led to his removal from office, from the Archaeological Society and from his professorship at the University of Athens, though he was able to return to public and academic life from 1912, and remained active in Greek archaeology until his death in 1928. (Full article...)

Panagiotis Kavvadias or Cawadias (Greek: Παναγιώτης Καββαδίας; 14 May [O.S. 2 May] 1850 – 20 July 1928) was a Greek archaeologist. He was responsible for the excavation of ancient sites in Greece, including Epidaurus in Argolis and the Acropolis of Athens, as well as archaeological discoveries on his native island of Kephallonia. As Ephor General (the head of the Greek Archaeological Service) from 1885 until 1909, Kavvadias oversaw the expansion of the Archaeological Service and the introduction of Law 2646 of 1899, which increased the state's powers to address the illegal excavation and smuggling of antiquities.

Kavvadias's work had a particular impact on the Acropolis of Athens, and has been credited with completing its "transformation [...] from castle to monument". Between 1885 and 1890, he removed almost all of the Acropolis's remaining medieval and modern structures, uncovering many ancient monuments in the process. He also played a role in the extensive reconstruction of the site by the architect and engineer Nikolaos Balanos. Though praised initially, the work caused considerable damage to several monuments and was almost completely deconstructed and rebuilt during the later 20th and early 21st centuries. Kavvadias oversaw the opening of the National Archaeological Museum in Athens, organised its first collections, and wrote some of its first catalogues.

As an administrator, Kavvadias was regarded as energetic, centralising and autocratic. His career saw significant modernisation in the practice of archaeology in Greece, and he reformed and professionalised the Archaeological Service. His patronage of Athens's foreign archaeological schools was credited with promoting the development of Greek archaeology, but was also criticised by native Greek archaeologists. He created further discontent among the Archaeological Society of Athens by reducing its role in favour of the governmental Archaeological Service. After the Goudi coup of 1909, dissatisfaction in the Greek press and among his subordinates in the Archaeological Service led to his removal from office, from the Archaeological Society and from his professorship at the University of Athens, though he was able to return to public and academic life from 1912, and remained active in Greek archaeology until his death in 1928. (Full article...)

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Melbourne has a temperate oceanic climate (Köppen climate classification Cfb), with warm summers and cool winters. Melbourne is well known for its changeable weather conditions, mainly due to it being located on the boundary of hot inland areas and the cool southern ocean. This temperature differential is most pronounced in the spring and summer months and can cause strong cold fronts to form. These cold fronts can be responsible for varied forms of severe weather from gales to thunderstorms and hail, large temperature drops and heavy rain. Winters, while exceptionally dry by southern Victorian standards, are nonetheless drizzly and overcast. The lack of winter rainfall is owed to Melbourne's rain shadowed location between the Otway and Macedon Ranges, which block much of the rainfall arriving from the north and west.

Port Phillip is often warmer than the surrounding oceans or the land mass, particularly in spring and autumn; this can set up a "bay effect rain", where showers are intensified leeward of the bay. Relatively narrow streams of heavy showers can often affect the same places (usually the eastern suburbs) for an extended period, while the rest of Melbourne and surrounds stays dry. Overall, the area around Melbourne is, owing to its rain shadow, nonetheless significantly drier than average for southern Victoria. Within the city and surrounds, rainfall varies widely, from around 425 mm (17 in) at Little River to 1,250 mm (49 in) on the eastern fringe at Gembrook. Melbourne receives 48.6 clear days annually. Dewpoint temperatures in the summer range from 9.5 to 11.7 °C (49.1 to 53.1 °F).

Melbourne is also prone to isolated convective showers forming when a cold pool crosses the state, especially if there is considerable daytime heating. These showers are often heavy and can include hail, squalls, and significant drops in temperature, but they often pass through very quickly with a rapid clearing trend to sunny and relatively calm weather and the temperature rising back to what it was before the shower. This can occur in the space of minutes and can be repeated many times a day, giving Melbourne a reputation for having "four seasons in one day", a phrase that is part of local popular culture. The lowest temperature on record is −2.8 °C (27.0 °F), on 21 July 1869. The highest temperature recorded in Melbourne city was 46.4 °C (115.5 °F), on 7 February 2009. While snow is occasionally seen at higher elevations in the outskirts of the city, and dustings were observed in 2020, it has not been recorded in the Central Business District since 1986.

The sea temperature in Melbourne is warmer than the surrounding ocean during the summer months, and colder during the winter months. This is predominantly due to Port Phillip Bay being an enclosed and shallow bay that is largely protected from the ocean, resulting in greater temperature variation across seasons. (Full article...)

Melbourne has a temperate oceanic climate (Köppen climate classification Cfb), with warm summers and cool winters. Melbourne is well known for its changeable weather conditions, mainly due to it being located on the boundary of hot inland areas and the cool southern ocean. This temperature differential is most pronounced in the spring and summer months and can cause strong cold fronts to form. These cold fronts can be responsible for varied forms of severe weather from gales to thunderstorms and hail, large temperature drops and heavy rain. Winters, while exceptionally dry by southern Victorian standards, are nonetheless drizzly and overcast. The lack of winter rainfall is owed to Melbourne's rain shadowed location between the Otway and Macedon Ranges, which block much of the rainfall arriving from the north and west.

Port Phillip is often warmer than the surrounding oceans or the land mass, particularly in spring and autumn; this can set up a "bay effect rain", where showers are intensified leeward of the bay. Relatively narrow streams of heavy showers can often affect the same places (usually the eastern suburbs) for an extended period, while the rest of Melbourne and surrounds stays dry. Overall, the area around Melbourne is, owing to its rain shadow, nonetheless significantly drier than average for southern Victoria. Within the city and surrounds, rainfall varies widely, from around 425 mm (17 in) at Little River to 1,250 mm (49 in) on the eastern fringe at Gembrook. Melbourne receives 48.6 clear days annually. Dewpoint temperatures in the summer range from 9.5 to 11.7 °C (49.1 to 53.1 °F).

Melbourne is also prone to isolated convective showers forming when a cold pool crosses the state, especially if there is considerable daytime heating. These showers are often heavy and can include hail, squalls, and significant drops in temperature, but they often pass through very quickly with a rapid clearing trend to sunny and relatively calm weather and the temperature rising back to what it was before the shower. This can occur in the space of minutes and can be repeated many times a day, giving Melbourne a reputation for having "four seasons in one day", a phrase that is part of local popular culture. The lowest temperature on record is −2.8 °C (27.0 °F), on 21 July 1869. The highest temperature recorded in Melbourne city was 46.4 °C (115.5 °F), on 7 February 2009. While snow is occasionally seen at higher elevations in the outskirts of the city, and dustings were observed in 2020, it has not been recorded in the Central Business District since 1986.

The sea temperature in Melbourne is warmer than the surrounding ocean during the summer months, and colder during the winter months. This is predominantly due to Port Phillip Bay being an enclosed and shallow bay that is largely protected from the ocean, resulting in greater temperature variation across seasons. (Full article...)

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