Duk abin da kuke buƙatar sani game da Oligocene

Oligocene

A lokacin Zamanin Cenozoic Akwai canje-canje iri-iri a doron duniya a matakin ilimin ƙasa da fure da fauna. A yau zamuyi magana ne game da zamani na uku wanda ya zama Cenozoic. Game da shi Oligocene. Oligocene ya fadada daga kimanin shekaru miliyan 33.9 da suka wuce zuwa kimanin shekaru miliyan 23 da suka gabata. A duk waɗannan shekarun duniyarmu ta sami canje-canje sanannu. Waɗannan canje-canje sune suka haifar da sake rarraba rayayyun halittu, da tsirrai da dabbobi. Bugu da kari, iklima ta taka muhimmiyar rawa yayin aiwatar da canje-canje a rayayyun halittu tunda ta samar da wasu yanayi ta yadda wasu dabbobi ko tsirrai zasu ci gaba sosai wasu kuma ba zasu iya rayuwa ba. Ta wannan hanyar, an kafa sabon salo na zaɓin yanayi.

A cikin wannan labarin zamu gaya muku duk abin da kuke buƙatar sani game da Oligocene.

Babban fasali

Dabbobin Oligocene

Lokacin Oligocene lokaci ne wanda koyaushe ke burge duk ƙwararrun masanan da suka mai da hankali kan karatun lokacin ilimin kasa. Duk waɗanda suka ɓatar da lokaci don koyon ɓoyayyun ɓangarorin ilimin ƙasa daban-daban an bar su da abubuwa masu ban sha'awa waɗanda suka faru da duniyarmu a lokacin Oligocene.

Lokaci ne wanda ya dauki kimanin shekaru miliyan 11. A wannan lokacin an sake tsara nahiyoyin saboda godiya na motsin naurorin duniya. Wannan yunƙurin ya sa nahiyoyi sun mallaki matsayi irin na waɗanda suke a yau. Oligocene kuma ana kiranta da shekarun dabbobi masu shayarwa. Kuma wannan shine ƙungiyar dabbobi waɗanda zasu iya samun haɓaka da yawa iri-iri a wannan lokacin. Yana cikin wannan lokacin na shekaru miliyan 11 lokacin da rabe-raben dabbobi masu shayarwa irin su beraye ko kano suka bayyana.

Game da ilimin ƙasa na Oligocene lokaci ne mai matukar tasiri na ilimin kasa da na orogenic. Zamu ga cewa rarrabuwa a cikin babbar nahiyar Pangea ya ci gaba kuma yawancin gutsure-tsarensa sun ƙaura zuwa matsuguni irin na yau. An gudanar da manyan matakai guda biyu a cikin wannan lokacin: Oramomin Laramide da Tsarin Alrogen.

Oligocene Geology

Cenozoic ilimin ƙasa

Zamu bi dukkan halaye na Oligocene daya bayan daya. Muna farawa da ilimin kasa. Yankewar manyan nahiyoyin da aka fi sani da Pangea ya kara bayyana a fili lokacin da aka raba gutsuren da ya dace da Kudancin Amurka. Wannan ƙaurawar nahiya ya haifar da tafiyar hawainiya zuwa yamma don saduwa da Arewacin Amurka da ƙirƙirar abin da muka sani a yau a matsayin nahiyar Amurka gaba ɗayanta.

Antarctica ta ci gaba da rabuwa da sauran nahiyoyin kuma murfin kankara ya zurfafa yayin da yake matsowa kusa da Pole ta Kudu. Akwai kwararru da yawa da suka musanta yanke shawara iri daban-daban kamar a wannan lokacin farantin da ya dace da nahiyar Afirka ya yi karo da Eurasia kuma hakan ma ya yi tare da gutsutsuren da muka sani yanzu kamar Indiya.

A ƙarshen Oligocene, duk talakawan ƙasa sun riga sun kasance cikin matsayi kwatankwacin wanda muke da shi a yau. Haka ma tekuna. An shirya tekuna ta yadda da akwai tekuna da yawa wadanda suka raba nahiyoyin yau. Daga cikin wadannan tekuna za mu iya ambaton Tekun Fasifik, Tekun Atlantika da Indiya.

Yanayin Oligocene

Zamanin Oligocene

Game da yanayin Oligocene, yanayin ya yi tsauri matuka. Ya kasance yana da yawancin yanayin ƙarancin zafi sosai. A duk tsawon wannan lokacin Antarctica da Greenland sun kasance cike da kankara kuma suna ƙaruwa sosai. Hakanan, lokacin da Antarctica ta rabu da Kudancin Amurka gaba ɗaya, hakan ya haifar da igiyoyin ruwa daban-daban don kewaya su gabadaya. Ofaya daga cikin waɗannan raƙuman ruwan teku shine Yankin Yankin Antarctic. Wannan yanayin ruwan yana ɗauke da ɗayan mahimmancin gaske, tunda shi ke da alhakin rufe duk nahiyar ta Antarctica da kankara da samuwar kankara.

Raguwar yanayin zafin duniya ya haifar da sakamako a cikin sauye-sauyen wasu halittu. Yawancin ciyawar sun kasance gandun daji masu rarrafe da yankewa. Waɗannan bishiyoyi sun sami damar tsira daga waɗannan mawuyacin yanayin saboda suna iya rayuwa cikin ƙarancin yanayin zafi.

Flora da fauna

Ci gaban dabbobi masu rarrafe

Duk rayuwa ta kara yaduwa zuwa cikin tsirrai da dabbobi. Duk da cewa yanayin yanayi bai dace da gabaɗaya ba, ƙwayoyin sun sami damar daidaitawa da waɗannan yanayin kuma sun rayu.

Bari muyi magana game da flora tukuna. Oligocene flora yana da halin gaskiyar cewa angiosperms na iya fara yaduwa ta hanyar yawancin wuraren zama. Wadannan tsire-tsire har ma sun kai mamayar da suke da ita a yau. A duk tsawon wannan lokacin, ana iya ganin raguwar dazuzzuka masu zafi saboda raguwar yanayin duniya. Waɗannan gandun daji na wurare masu zafi an maye gurbinsu da shuke-shuke masu ciyayi da filayen ciyayi waɗanda suka dace da yanayin yanayin zafin yanayi mafi tsananin gaske. Wadannan ciyawar ciyawar da shuke-shuke sun bazu a duk nahiyoyin duniya.

Kuma shine cewa tsire-tsire masu tsire-tsire sun sami babban nasarar juyin halitta sakamakon dacewar halayensu yayin girma. Wadannan tsire-tsire suna da ci gaban ci gaba wanda baya tsayawa. Bugu da kari, wadannan nau'ikan tsire-tsire sun fuskanci aikin dabbobi iri-iri kamar su makiyaya da ke ciyar da su. Wannan shine yadda zasu iya haɓaka ƙarfin daidaitawa daban-daban don su iya rayuwa a cikin waɗannan mahalli har ma su kulla alaƙa da wasu dabbobi. Kuma yawancin dabbobi ne suka taimaka musu wajen yada kwayayensu ta hanyar najasa.

A wannan lokacin kuma An haɓaka tsire-tsire kamar su wake.

Game da fauna, akwai rukunin dabbobi da yawa waɗanda suka sami damar fadadawa da haɓaka yankin rarraba su. Duk da yanayin canjin yanayin da aka same su, kungiyoyin dabbobi da yawa kamar tsuntsaye, dabbobi masu rarrafe da dabbobi masu shayarwa sun kara rarrabawa.

Akwai tsuntsaye da dabbobi masu rarrafe, kodayake dabbobi masu shayarwa sun ɗauki mafi girman sanannun. Yana da mahimmanci a lura cewa Cenozoic ana ɗaukarsa zamanin mambobi ne.

Ina fatan cewa tare da wannan bayanin zaku iya koyo game da Oligocene.


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