Cronozona

m  c
Cronostratigrafiche Geocronologiche Intervallo temporale (Ma = milioni di anni)
mezzo miliardo di anni
molte centinaia di Ma
da 22 a 80 Ma
decine di Ma
da 2 a 10 Ma
Chron
 non usate nella scala ICS

Una cronozona in stratigrafia è una porzione di tempo che inizia da un evento identificabile e termina con un altro evento altrettanto ben identificabile. La cronozona è un’unità in cronostratigrafia, identificata da eventi come l’inversione geomagnetica (magnetozona) o dalla presenza di specifici fossili (biozona o biocronozona). Nel caso dei reperti fossili, gli eventi marcatori sono di solito la scomparsa (estinzione) di specie ampiamente distribuite o l'apparizione di una data specie negli orizzonti stratigrafici. In accordo con la Commissione Internazionale di Stratigrafia, il termine cronozona indica le rocce formate durante un particolare intervallo di tempo, mentre il termine chron si riferisce all’intervallo di tempo corrispondente alla cronozona. Le cronozone sono utili indicatori o punti di riferimento temporali nel record geologico, non sono gerarchiche e non necessitano di corrispondenze tra confini geografici o geologici e nemmeno uguaglianza dimensionale (a parte un iniziale vincolo che richiedeva la cronozona di dimensione minore del piano geologico). L’uso iniziale è stato gerarchico, (Harland ed altri, 1989), dove cronozona indicava un intervallo di tempo più breve di uno stadio faunistico, come definito in biostratigrafia.[3] La Commissione Internazionale di Stratigrafia ha sostituito questo utilizzo. Il fattore chiave nel designare una cronozona accettabile internazionalmente è che la colonna fossile complessiva sia chiaramente identificabile, non ambigua e diffusa geograficamente. Alcune cronozone accettate ne contengono altre ed alcune cronozone più estese corrispondono nella loro interezza all’unità alla quale appartengono. Per esempio, la cronozona Pliocene è un sottoinsieme della cronozona Neogene e la cronozona Pleistocene è un sottoinsieme della cronozona Quaternario. Tali cronozone sono utilizzate dalla Commissione Internazionale di Stratigrafia per definire i limiti temporali della durata dei vari periodi di tempo (Eone, Era, Periodo, Epoca, Stadio) in cui è suddivisa la Scala dei tempi geologici.

Note

  1. ^ Guida italiana alla classificazione e alla terminologia stratigrafica, Scheda sulle unità cronostratigrafiche (PDF), su isprambiente.gov.it. URL consultato il 4 dicembre 2012.
  2. ^ International Stratigraphic Chart, su stratigraphy.org, International Commission on Stratigraphy.
  3. ^ (EN) An early use in Harland, W.B., Armstrong, R.L., Cox, A.V., Craig, L.E., Smith, A.G., and Smith, D.G. (1989) A Geologic Time Scale Cambridge Univ. Press, Cambridge

Collegamenti esterni

  Portale Geologia: accedi alle voci di Wikipedia che trattano di geologia

Read other articles:

Bacang (makanan)

Artikel ini membahas variasi makanan khas Tiongkok yang dinamakan Bakcang. Untuk bacang spesies tumbuhan, silakan lihat Bacang. BacangBeberapa bacang yang diikat dengan benangNama lainZongzi, bak-cang, bah-cang, nyukcung / ngiug-zung, cung-e / zung-eJenisKue beras, kue ketanTempat asalTiongkokDaerahberbagai daerah di Tiongkok, daerah beretnis TionghoaDibuat olehBangsa TionghoaBahan utamaBeras ketan diisi dengan isian berbeda dan dibungkus dengan daun bambu atau daun pandan.Hidangan serupaMont...

 

 

List of The Last Ship characters

This is an overview of the regular, recurring, and other characters of the TV series The Last Ship. Overview Character Portrayed by Occupation Seasons 1 2 3 4 5 Tom Chandler Eric Dane Commanding Officer, USS Nathan James Chief of Naval Operations US Naval Academy Instructor Main Rachel Scott Rhona Mitra Paleomicrobiologist Main — Mike Slattery Adam Baldwin Executive Officer, USS Nathan James Commanding Officer, USS Nathan James Main Russ Jeter Charles Parnell Command Master Chief Petty Offi...

 

 

Universitas Ibnu Chaldun

Untuk perguruan tinggi bernama mirip di Bogor, lihat Universitas Ibn Khaldun Bogor. Artikel ini tidak memiliki referensi atau sumber tepercaya sehingga isinya tidak bisa dipastikan. Tolong bantu perbaiki artikel ini dengan menambahkan referensi yang layak. Tulisan tanpa sumber dapat dipertanyakan dan dihapus sewaktu-waktu.Cari sumber: Universitas Ibnu Chaldun – berita · surat kabar · buku · cendekiawan · JSTOR Didirikan1956AfiliasiIslamRektorDr. Rahmah...

Bauria railway station

Railway station in West Bengal, India Bauria Kolkata Suburban Railway stationBauria Railway StationGeneral informationLocationBauria, Howrah district, West BengalIndiaCoordinates22°30′10″N 88°09′48″E / 22.502692°N 88.163248°E / 22.502692; 88.163248Elevation6 metres (20 ft)Owned byIndian RailwaysLine(s)Howrah–Kharagpur linePlatforms5ConstructionStructure typeStandard on-ground stationParkingNoBicycle facilitiesyesOther informationStation codeBVAFare z...

 

 

Ellen McCormack

American politician Ellen McCormackPersonal detailsBornEleanor Rose Cullen(1926-09-15)September 15, 1926The Bronx, New York, U.S.DiedMarch 27, 2011(2011-03-27) (aged 84)Avon, Connecticut, U.S.Political partyRight to LifeOther politicalaffiliationsDemocraticSpouse Francis J. McCormack ​ ​(m. 1949; died 1993)​Children4 Ellen Cullen McCormack (September 15, 1926 – March 27, 2011)[1][2] was an American politician who was a...

 

 

2016 United States Senate election in Arkansas

See also: 2016 United States Senate elections 2016 United States Senate election in Arkansas ← 2010 November 8, 2016 2022 → Turnout38.39%   Nominee John Boozman Conner Eldridge Party Republican Democratic Popular vote 661,984 400,602 Percentage 59.77% 36.17% County results Congressional district results Township results Precinct results Boozman:      40–50%      50–60%      60–70% ...

Adam Darius

Adam Darius: Helsinki, 2007. Adam Darius (kelahiran 10 Mei 1930)[1] adalah seorang penari, artis mime, penulis dan koreografer Amerika. Sebagai seorang penampil, ia tampil di lebih dari 85 negara pada enam benua.[2] Sebagai seorang penulis, ia telah menerbitkan 18 buku dan menulis 22 permainan panggung. Adam Darius sekarang tinggal di Espoo, Finlandia. [3] Dalam sebuah program yang menyoroti kariernya, BBC World Service mendeskripsikannya sebagai salah satu orang berba...

 

 

Mount House School

Not to be confused with Mount House School, Tavistock. School in Monken Hadley, North London, EnglandMount House SchoolAddressCamlet WayMonken Hadley, North London, EN4 0NJEnglandInformationMottoInspiring Every IndividualEstablished2017 (previously St Martha’s since 1947)Department for Education URN101374 TablesHeadSarah RichardsonGenderCo-educationalAge11 to 18Enrolmentc. 300HousesRushmore, Everest, Chimborazo and OlympusColour(s)Green and Gold    Portrait of Joseph Henry Gre...

 

 

Синелобый амазон

Синелобый амазон Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:ЗавропсидыКласс:Пт�...

Человек прямоходящий

† Человек прямоходящий Научная классификация Домен:ЭукариотыЦарство:ЖивотныеПодцарство:ЭуметазоиБез ранга:Двусторонне-симметричныеБез ранга:ВторичноротыеТип:ХордовыеПодтип:ПозвоночныеИнфратип:ЧелюстноротыеНадкласс:ЧетвероногиеКлада:АмниотыКлада:Синапсиды�...

 

 

Processo di produzione industriale

Questa voce sull'argomento Ingegneria è solo un abbozzo. Contribuisci a migliorarla secondo le convenzioni di Wikipedia. Segui i suggerimenti del progetto di riferimento. Impianto petrolchimico industriale per la trasformazione degli idrocarburi e produzione di gomma sintetica Per processo di produzione industriale (o processo produttivo) si intende una delle fasi della produzione di un prodotto commerciale, generalmente composto da più stadi attraverso i quali questo prende forma, la...

 

 

Puerto Ricans in World War II

Then-Major General Pedro del Valle, U.S. Marine Corps (second from left) was the first Puerto Rican to achieve a general rank, is greeted by then-Colonel Chesty Puller, U.S. Marine Corps, on Pavuvu in late October 1944, while Major General Rupertus, U.S. Marine Corps, (far left) looks on. Puerto Ricans and people of Puerto Rican descent have participated as members of the United States Armed Forces in the American Civil War and in every conflict which the United States has been involved sinc...

أتراك

هذه المقالة عن المجموعة العرقية الأتراك وليس عن من يحملون جنسية الجمهورية التركية أتراكTürkler (بالتركية) التعداد الكليالتعداد 70~83 مليون نسمةمناطق الوجود المميزةالبلد  القائمة ... تركياألمانياسورياالعراقبلغارياالولايات المتحدةفرنساالمملكة المتحدةهولنداالنمساأسترالي�...

 

 

Террор (телесериал)

У этого термина существуют и другие значения, см. Террор. Террорангл. The Terror Жанры ДрамаТриллер На основе «Террор»Дэна Симмонса(1 сезон) Разработчики 1 сезонДэвид Кайганич2 сезонАлександр ВуМакс Боренштейн В главных ролях 1 сезонДжаред ХаррисТобайас МензисПол РедиАдам...

 

 

Iranian Revolution

Revolution in Iran from 1978 to 1979 This article is about the 1979 revolution. For the 1905–1911 revolution, see Persian Constitutional Revolution. For the series of reforms launched in 1963, see White Revolution. 1979 Revolution redirects here. For the video game based on the events, see 1979 Revolution: Black Friday. Iranian RevolutionPart of the Cold WarMass demonstrations of people protesting against the Shah and the Pahlavi government on the day of Hosseini's Ashura on 11 December 197...

Spring Grove, Minnesota

City in Minnesota, United States City in Minnesota, United StatesSpring GroveCityMotto: pretty. neat. small town.Location of Spring Grove, MinnesotaCoordinates: 43°33′40″N 91°38′14″W / 43.56111°N 91.63722°W / 43.56111; -91.63722CountryUnited StatesStateMinnesotaCountyHoustonGovernment • MayorSaundra Solum [citation needed]Area[1] • Total0.99 sq mi (2.58 km2) • Land0.99 sq mi (...

 

 

Carlo Barsotti

Italian-American newspaper and bank owner Carlo BarsottiBorn1850Pisa, Grand Duchy of TuscanyDied1927New Jersey, United StatesOccupation(s)Newspaper and bank owner Carlo Barsotti was an Italian-American newspaper and bank owner. He was born in Pisa, Grand Duchy of Tuscany, in 1850 and died in New Jersey, United States, in 1927. Biography Barsotti emigrated from Italy to New York City in 1872. In 1879, he founded the Il Progresso Italo-Americano newspaper in New York City with Vincenzo Polidori...

 

 

East West Players

Asian-American theatre company East West PlayersFormation1965; 59 years ago (1965)[1]TypeTheatre groupPurposeAsian American theatreLocationUnion Center for the Arts120 Judge John Aiso St.Little Tokyo, Los Angeles, California 90012Websiteeastwestplayers.org East West Players is an Asian American theatre organization in Los Angeles, founded in 1965.[1] As the nation's first professional Asian American theatre organization, East West Players continues to produce...

Chargeman Ken!

1974 sci-fi anime TV series Chargeman Ken!Cover for the First DVD Volume.チャージマン研！(Chājiman Ken!)GenreScience fictionCreated byEiji TanakaTetsuji Suzukawa Anime television seriesDirected byNoboru MiuraProduced byHiromichi MogakiWritten byMasaaki WakudaToyohiro AndōYoshio TamadoMusic byKunio MiyauchiStudioKnack ProductionsLicensed byNA: Discotek MediaOriginal networkFirst-run syndicationOriginal run April 1, 1974 – June 28, 1974Episodes65 MangaW...

 

 

379th Expeditionary Operations Group

This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (December 2012) (Learn how and when to remove this message) 379th Expeditionary Operations GroupEmblem of the 379th Expeditionary Operations GroupActive1942–1945; 2003–presentCountryUnited StatesBranchUnited States Air ForceMilitary unit A B-1B Bomber takes off from the 379th Air Expeditionary Wing. B-1s from...