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54-1011: Khorat Group Stratigraphic range : Berriasian - Aptian ~ 145–113  Ma PreꞒ Ꞓ O S D C P T J K Pg N [REDACTED] Location of the Khorat Group within the Khorat Plateau (Brown and yellow) Type stratigraphic group Sub-units Khok Kruat Formation Phu Phan Formation Sao Khua Formation Phra Wihan Formation Phu Kradung Formation Underlies Maha Sarakham Formation Overlies Nam Phong Formation Lithology Primary Sandstone , mudstone Location Region Southeast Asia Country [REDACTED]   Thailand Extent Isan Type section Named for Khorat Plateau Named by Ward & Bunnag Year defined 1964 The Khorat Group

108-558: A first-class entity , rather than the specific place where the object is located at a certain time. It implements the Uniform Resource Identifier ( Uniform Resource Name ) concept and adds to it a data model and social infrastructure. A DOI name also differs from standard identifier registries such as the ISBN , ISRC , etc. The purpose of an identifier registry is to manage a given collection of identifiers, whereas

162-448: A DOI name is a handle, and so has a set of values assigned to it and may be thought of as a record that consists of a group of fields. Each handle value must have a data type specified in its <type> field, which defines the syntax and semantics of its data. While a DOI persistently and uniquely identifies the object to which it is assigned, DOI resolution may not be persistent, due to technical and administrative issues. To resolve

216-540: A DOI name, it may be input to a DOI resolver, such as doi.org . Another approach, which avoids typing or copying and pasting into a resolver is to include the DOI in a document as a URL which uses the resolver as an HTTP proxy, such as https://doi.org/ (preferred) or http://dx.doi.org/ , both of which support HTTPS. For example, the DOI 10.1000/182 can be included in a reference or hyperlink as https://doi.org/10.1000/182 . This approach allows users to click on

270-401: A managed registry (providing both social and technical infrastructure). It does not assume any specific business model for the provision of identifiers or services and enables other existing services to link to it in defined ways. Several approaches for making identifiers persistent have been proposed. The comparison of persistent identifier approaches is difficult because they are not all doing

324-544: A non-profit organization created in 1997, is the governance body of the DOI system. It safeguards all intellectual property rights relating to the DOI system, manages common operational features, and supports the development and promotion of the DOI system. The IDF ensures that any improvements made to the DOI system (including creation, maintenance, registration, resolution and policymaking of DOI names) are available to any DOI registrant. It also prevents third parties from imposing additional licensing requirements beyond those of

378-775: A proxy for the age at which a surface, such as an alluvial fan, was created. Burial dating uses the differential radioactive decay of 2 cosmogenic elements as a proxy for the age at which a sediment was screened by burial from further cosmic rays exposure. Luminescence dating techniques observe 'light' emitted from materials such as quartz, diamond, feldspar, and calcite. Many types of luminescence techniques are utilized in geology, including optically stimulated luminescence (OSL), cathodoluminescence (CL), and thermoluminescence (TL). Thermoluminescence and optically stimulated luminescence are used in archaeology to date 'fired' objects such as pottery or cooking stones and can be used to observe sand migration. Incremental dating techniques allow

432-487: A reference for newly obtained poles for the rocks with unknown age. For paleomagnetic dating, it is suggested to use the APWP in order to date a pole obtained from rocks or sediments of unknown age by linking the paleopole to the nearest point on the APWP. Two methods of paleomagnetic dating have been suggested: (1) the angular method and (2) the rotation method. The first method is used for paleomagnetic dating of rocks inside of

486-419: A transaction, etc. The names can refer to objects at varying levels of detail: thus DOI names can identify a journal, an individual issue of a journal, an individual article in the journal, or a single table in that article. The choice of level of detail is left to the assigner, but in the DOI system it must be declared as part of the metadata that is associated with a DOI name, using a data dictionary based on

540-682: Is a persistent identifier or handle used to uniquely identify various objects, standardized by the International Organization for Standardization (ISO). DOIs are an implementation of the Handle System ; they also fit within the URI system ( Uniform Resource Identifier ). They are widely used to identify academic, professional, and government information, such as journal articles, research reports, data sets, and official publications . A DOI aims to resolve to its target,

594-730: Is a stratigraphic group located within the Khorat Plateau in the Isan region of Thailand . It was first defined as the Khorat Series by Brown et al in 1953 and was redefined as the Khorat Group by Ward and Bunnag in 1964, which gave it its current constituent formations as well as including the Nam Phong Formation , which is now excluded from the group. Subsequently the sequence underwent several different stratigraphic proposals with several alternative divisions, but

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648-450: Is a type of Handle System handle, which takes the form of a character string divided into two parts, a prefix and a suffix, separated by a slash. The prefix identifies the registrant of the identifier and the suffix is chosen by the registrant and identifies the specific object associated with that DOI. Most legal Unicode characters are allowed in these strings, which are interpreted in a case-insensitive manner. The prefix usually takes

702-720: Is also correct to say that fossils of the genus Tyrannosaurus have been found in the Upper Cretaceous Series. In the same way, it is entirely possible to go and visit an Upper Cretaceous Series deposit – such as the Hell Creek deposit where the Tyrannosaurus fossils were found – but it is naturally impossible to visit the Late Cretaceous Epoch as that is a period of time. Doi (identifier) A digital object identifier ( DOI )

756-500: Is also often used as a dating tool in archaeology, since the dates of some eruptions are well-established. Geochronology, from largest to smallest: It is important not to confuse geochronologic and chronostratigraphic units. Geochronological units are periods of time, thus it is correct to say that Tyrannosaurus rex lived during the Late Cretaceous Epoch. Chronostratigraphic units are geological material, so it

810-461: Is different in application from biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloging and comparing fossil floral and faunal assemblages. Biostratigraphy does not directly provide an absolute age determination of a rock, but merely places it within an interval of time at which that fossil assemblage is known to have coexisted. Both disciplines work together hand in hand, however, to

864-696: Is maintained by the International DOI Foundation. The IDF is recognized as one of the federated registrars for the Handle System by the DONA Foundation (of which the IDF is a board member), and is responsible for assigning Handle System prefixes under the top-level 10 prefix. Registration agencies generally charge a fee to assign a new DOI name; parts of these fees are used to support the IDF. The DOI system overall, through

918-1050: Is notable for its fossil content, including those of dinosaurs. References [ edit ] ^ Sattayarak, Nares (1983). "Review of the Continental Mesozoic Stratigraphy of Thailand" (PDF) . Workshop on Stratigraphic Correlation of Thailand and Malaysia . ^ Racey, Andrew; Goodall, Jeffery G. S. (2009). "Palynology and stratigraphy of the Mesozoic Khorat Group red bed sequences from Thailand". Geological Society, London, Special Publications . 315 (1): 69–83. CiteSeerX   10.1.1.1030.8425 . doi : 10.1144/sp315.6 . ISSN   0305-8719 . Retrieved from " https://en.wikipedia.org/w/index.php?title=Khorat_Group&oldid=1166915593 " Categories : Geologic groups of Asia Geologic formations of Thailand Lower Cretaceous Series of Asia Cretaceous Thailand Geochronology Geochronology

972-464: Is shown with a DOI name that leads to an Excel file of data underlying the tables and graphs. Further development of such services is planned. Other registries include Crossref and the multilingual European DOI Registration Agency (mEDRA) . Since 2015, RFCs can be referenced as doi:10.17487/rfc ... . The IDF designed the DOI system to provide a form of persistent identification , in which each DOI name permanently and unambiguously identifies

1026-559: Is to use one of a number of add-ons and plug-ins for browsers , thereby avoiding the conversion of the DOIs to URLs, which depend on domain names and may be subject to change, while still allowing the DOI to be treated as a normal hyperlink. A disadvantage of this approach for publishers is that, at least at present, most users will be encountering the DOIs in a browser, mail reader , or other software which does not have one of these plug-ins installed. The International DOI Foundation ( IDF ),

1080-532: The Ar/ Ar dating method can be extended into the time of early human life and into recorded history. Some of the commonly used techniques are: A series of related techniques for determining the age at which a geomorphic surface was created ( exposure dating ), or at which formerly surficial materials were buried (burial dating). Exposure dating uses the concentration of exotic nuclides (e.g. Be, Al, Cl) produced by cosmic rays interacting with Earth materials as

1134-497: The indecs Content Model . The official DOI Handbook explicitly states that DOIs should be displayed on screens and in print in the format doi:10.1000/182 . Contrary to the DOI Handbook , Crossref , a major DOI registration agency, recommends displaying a URL (for example, https://doi.org/10.1000/182 ) instead of the officially specified format. This URL is persistent (there is a contract that ensures persistence in

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1188-485: The DOI System. It requires an additional layer of administration for defining DOI as a URN namespace (the string urn:doi:10.1000/1 rather than the simpler doi:10.1000/1 ) and an additional step of unnecessary redirection to access the resolution service, already achieved through either http proxy or native resolution. If RDS mechanisms supporting URN specifications become widely available, DOI will be registered as

1242-413: The DOI as a normal hyperlink . Indeed, as previously mentioned, this is how Crossref recommends that DOIs always be represented (preferring HTTPS over HTTP), so that if they are cut-and-pasted into other documents, emails, etc., they will be actionable. Other DOI resolvers and HTTP Proxies include the Handle System and PANGAEA . At the beginning of the year 2016, a new class of alternative DOI resolvers

1296-409: The DOI system associates metadata with objects. A small kernel of common metadata is shared by all DOI names and can be optionally extended with other relevant data, which may be public or restricted. Registrants may update the metadata for their DOI names at any time, such as when publication information changes or when an object moves to a different URL. The International DOI Foundation (IDF) oversees

1350-436: The DOI system have deliberately not registered a DOI namespace for URNs , stating that: URN architecture assumes a DNS-based Resolution Discovery Service (RDS) to find the service appropriate to the given URN scheme. However no such widely deployed RDS schemes currently exist.... DOI is not registered as a URN namespace, despite fulfilling all the functional requirements, since URN registration appears to offer no advantage to

1404-459: The DOI system. DOI name-resolution may be used with OpenURL to select the most appropriate among multiple locations for a given object, according to the location of the user making the request. However, despite this ability, the DOI system has drawn criticism from librarians for directing users to non-free copies of documents, that would have been available for no additional fee from alternative locations. The indecs Content Model as used within

1458-634: The DOI useless. The developer and administrator of the DOI system is the International DOI Foundation (IDF), which introduced it in 2000. Organizations that meet the contractual obligations of the DOI system and are willing to pay to become a member of the system can assign DOIs. The DOI system is implemented through a federation of registration agencies coordinated by the IDF. By late April 2011 more than 50 million DOI names had been assigned by some 4,000 organizations, and by April 2013 this number had grown to 85 million DOI names assigned through 9,500 organizations. Fake registries have even appeared. A DOI

1512-501: The IDF on users of the DOI system. The IDF is controlled by a Board elected by the members of the Foundation, with an appointed Managing Agent who is responsible for co-ordinating and planning its activities. Membership is open to all organizations with an interest in electronic publishing and related enabling technologies. The IDF holds annual open meetings on the topics of DOI and related issues. Registration agencies, appointed by

1566-600: The IDF, operates on a not-for-profit cost recovery basis. The DOI system is an international standard developed by the International Organization for Standardization in its technical committee on identification and description, TC46/SC9. The Draft International Standard ISO/DIS 26324, Information and documentation – Digital Object Identifier System met the ISO requirements for approval. The relevant ISO Working Group later submitted an edited version to ISO for distribution as an FDIS (Final Draft International Standard) ballot, which

1620-472: The IDF, provide services to DOI registrants: they allocate DOI prefixes, register DOI names, and provide the necessary infrastructure to allow registrants to declare and maintain metadata and state data. Registration agencies are also expected to actively promote the widespread adoption of the DOI system, to cooperate with the IDF in the development of the DOI system as a whole, and to provide services on behalf of their specific user community. A list of current RAs

1674-409: The amount of radioactive decay of a radioactive isotope with a known half-life , geologists can establish the absolute age of the parent material. A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods. More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years. With

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1728-459: The characters 1000 in the prefix identify the registrant; in this case the registrant is the International DOI Foundation itself. 182 is the suffix, or item ID, identifying a single object (in this case, the latest version of the DOI Handbook ). DOI names can identify creative works (such as texts, images, audio or video items, and software) in both electronic and physical forms, performances , and abstract works such as licenses, parties to

1782-436: The construction of year-by-year annual chronologies, which can be fixed ( i.e. linked to the present day and thus calendar or sidereal time ) or floating. A sequence of paleomagnetic poles (usually called virtual geomagnetic poles), which are already well defined in age, constitutes an apparent polar wander path (APWP). Such a path is constructed for a large continental block. APWPs for different continents can be used as

1836-462: The document, whereas its location and other metadata may change. Referring to an online document by its DOI should provide a more stable link than directly using its URL. But if its URL changes, the publisher must update the metadata for the DOI to maintain the link to the URL. It is the publisher's responsibility to update the DOI database. If they fail to do so, the DOI resolves to a dead link , leaving

1890-403: The doi.org domain, ) so it is a PURL —providing the location of an name resolver which will redirect HTTP requests to the correct online location of the linked item. The Crossref recommendation is primarily based on the assumption that the DOI is being displayed without being hyperlinked to its appropriate URL—the argument being that without the hyperlink it is not as easy to copy-and-paste

1944-416: The exception of the radiocarbon method , most of these techniques are actually based on measuring an increase in the abundance of a radiogenic isotope, which is the decay-product of the radioactive parent isotope. Two or more radiometric methods can be used in concert to achieve more robust results. Most radiometric methods are suitable for geological time only, but some such as the radiocarbon method and

1998-457: The form 10.NNNN , where NNNN is a number greater than or equal to 1000 , whose limit depends only on the total number of registrants. The prefix may be further subdivided with periods, like 10.NNNN.N . For example, in the DOI name 10.1000/182 , the prefix is 10.1000 and the suffix is 182 . The "10" part of the prefix distinguishes the handle as part of the DOI namespace, as opposed to some other Handle System namespace, and

2052-617: The formations proposed in Ward and Bunnag are the most widely used. Initially thought to be Triassic , the sequence has been shown to be of Early Cretaceous in age, Dating from the Berriasian to Aptian . It overlies the Nam Phong Formation and is overlain by the evaporitic deposits of the Maha Sarakham Formation . It consists of continental freshwater deposits largely of alternating sandstones and mudstones. The Group

2106-564: The full URL to actually bring up the page for the DOI, thus the entire URL should be displayed, allowing people viewing the page containing the DOI to copy-and-paste the URL, by hand, into a new window/tab in their browser in order to go to the appropriate page for the document the DOI represents. Major content of the DOI system currently includes: In the Organisation for Economic Co-operation and Development 's publication service OECD iLibrary , each table or graph in an OECD publication

2160-443: The functionality of a registry-controlled scheme and will usually lack accompanying metadata in a controlled scheme. The DOI system does not have this approach and should not be compared directly to such identifier schemes. Various applications using such enabling technologies with added features have been devised that meet some of the features offered by the DOI system for specific sectors (e.g., ARK ). A DOI name does not depend on

2214-405: The information object to which the DOI refers. This is achieved by binding the DOI to metadata about the object, such as a URL where the object is located. Thus, by being actionable and interoperable , a DOI differs from ISBNs or ISRCs which are identifiers only. The DOI system uses the indecs Content Model to represent metadata . The DOI for a document remains fixed over the lifetime of

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2268-547: The integration of these technologies and operation of the system through a technical and social infrastructure. The social infrastructure of a federation of independent registration agencies offering DOI services was modelled on existing successful federated deployments of identifiers such as GS1 and ISBN . A DOI name differs from commonly used Internet pointers to material, such as the Uniform Resource Locator (URL), in that it identifies an object itself as

2322-430: The object to which it is associated (although when the publisher of a journal changes, sometimes all the DOIs will be changed, with the old DOIs no longer working). It also associates metadata with objects, allowing it to provide users with relevant pieces of information about the objects and their relationships. Included as part of this metadata are network actions that allow DOI names to be resolved to web locations where

2376-467: The object's location and, in this way, is similar to a Uniform Resource Name (URN) or PURL but differs from an ordinary URL. URLs are often used as substitute identifiers for documents on the Internet although the same document at two different locations has two URLs. By contrast, persistent identifiers such as DOI names identify objects as first class entities: two instances of the same object would have

2430-454: The objects they describe can be found. To achieve its goals, the DOI system combines the Handle System and the indecs Content Model with a social infrastructure. The Handle System ensures that the DOI name for an object is not based on any changeable attributes of the object such as its physical location or ownership, that the attributes of the object are encoded in its metadata rather than in its DOI name, and that no two objects are assigned

2484-459: The point where they share the same system of naming strata (rock layers) and the time spans utilized to classify sublayers within a stratum. The science of geochronology is the prime tool used in the discipline of chronostratigraphy , which attempts to derive absolute age dates for all fossil assemblages and determine the geologic history of the Earth and extraterrestrial bodies . By measuring

2538-467: The primary purpose of the DOI system is to make a collection of identifiers actionable and interoperable, where that collection can include identifiers from many other controlled collections. The DOI system offers persistent, semantically interoperable resolution to related current data and is best suited to material that will be used in services outside the direct control of the issuing assigner (e.g., public citation or managing content of value). It uses

2592-411: The same DOI name. DOI name resolution is provided through the Handle System , developed by Corporation for National Research Initiatives , and is freely available to any user encountering a DOI name. Resolution redirects the user from a DOI name to one or more pieces of typed data: URLs representing instances of the object, services such as e-mail, or one or more items of metadata. To the Handle System,

2646-540: The same DOI name. Because DOI names are short character strings, they are human-readable, may be copied and pasted as text, and fit into the URI specification. The DOI name-resolution mechanism acts behind the scenes, so that users communicate with it in the same way as with any other web service; it is built on open architectures , incorporates trust mechanisms , and is engineered to operate reliably and flexibly so that it can be adapted to changing demands and new applications of

2700-426: The same age and of such distinctive composition and appearance that, despite their presence in different geographic sites, there is certainty about their age-equivalence. Fossil faunal and floral assemblages , both marine and terrestrial, make for distinctive marker horizons. Tephrochronology is a method for geochemical correlation of unknown volcanic ash (tephra) to geochemically fingerprinted, dated tephra . Tephra

2754-700: The same continental block. The second method is used for the folded areas where tectonic rotations are possible. Magnetostratigraphy determines age from the pattern of magnetic polarity zones in a series of bedded sedimentary and/or volcanic rocks by comparison to the magnetic polarity timescale. The polarity timescale has been previously determined by dating of seafloor magnetic anomalies, radiometrically dating volcanic rocks within magnetostratigraphic sections, and astronomically dating magnetostratigraphic sections. Global trends in isotope compositions, particularly carbon-13 and strontium isotopes, can be used to correlate strata. Marker horizons are stratigraphic units of

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2808-431: The same thing. Imprecisely referring to a set of schemes as "identifiers" does not mean that they can be compared easily. Other "identifier systems" may be enabling technologies with low barriers to entry, providing an easy to use labeling mechanism that allows anyone to set up a new instance (examples include Persistent Uniform Resource Locator (PURL), URLs, Globally Unique Identifiers (GUIDs), etc.), but may lack some of

2862-521: Was approved by 100% of those voting in a ballot closing on 15 November 2010. The final standard was published on 23 April 2012. DOI is a registered URI under the info URI scheme specified by IETF RFC   4452 . info:doi/ is the infoURI Namespace of Digital Object Identifiers. The DOI syntax is a NISO standard, first standardized in 2000, ANSI/NISO Z39.84-2005 Syntax for the Digital Object Identifier. The maintainers of

2916-619: Was started by http://doai.io. This service is unusual in that it tries to find a non-paywalled (often author archived ) version of a title and redirects the user to that instead of the publisher's version . Since then, other open-access favoring DOI resolvers have been created, notably https://oadoi.org/ in October 2016 (later Unpaywall ). While traditional DOI resolvers solely rely on the Handle System, alternative DOI resolvers first consult open access resources such as BASE (Bielefeld Academic Search Engine). An alternative to HTTP proxies

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