A cikin zamanin Mesozoic akwai lokuta 3 waɗanda suka raba abubuwa daban-daban waɗanda suka nuna farkon farawa da ƙarshe duka a matakin ilimin ƙasa da ilimin halitta. Lokacin farko shine Triassic kuma a yau zamu maida hankali ne akan lokaci na biyu na Mesozoic. Labari ne game da Jurassic. Rabuwa ne ga lokacin ilimin ƙasa wanda ya fara kimanin shekaru miliyan 199 da suka gabata kuma ya ƙare kimanin shekaru miliyan 145 da suka gabata. Kamar yadda yake a yawancin zamanin ilimin ƙasa, duka farkon da ƙarshen lokutan basu cika daidai ba.
A cikin wannan labarin zamu gaya muku duk halaye, ilimin ƙasa, yanayi, fure da fauna na Jurassic.
Babban fasali
Lokaci ne wanda wasu mahimman abubuwan suka faru a duniya kuma hakan shine bayan Triassic da kuma gaban Cretaceous. Sunan Jurassic ya fito ne daga tsarin samar da sinadarin carbonate wanda ya faru a yankin Turai na Jura, wanda yake a cikin Alps. Saboda haka sunan shine Jurassic. A duk tsawon wannan lokacin daya daga cikin manyan halayen da ya yi fice a kansu shi ne mulkin manyan dinosaur (wanda aka yi fina-finai da yawa) da kuma rarrabuwar babbar nahiyar Pangea zuwa nahiyoyin Laurasia da Gondwana.
Ostiraliya ta rabu da rabon da ake kira Gondawana yayin Upper Jurassic da farkon Cretaceous. Ta wannan hanyar, aka raba Laurasia zuwa abin da muka sani a yau kamar Arewacin Amurka da Eurasia, wanda ya haifar da sababbin nau'o'in dabbobi masu shayarwa kamar yadda yanayin muhalli ya canza ga dukkan su.
Jurassic ilimin ƙasa
Wannan lokacin ilimin kasa ya fi karkata zuwa kananan, tsakiya da babba. Waɗannan sanannun zamanin sune cikin lokaci. An ba shi sunaye Lias, Dogger, da Malm. A lokacin Jurassic matakin teku ya sami ƙananan canje-canje da yawa amma a lokacin cikin ciki. Tuni a cikin Jurassic na sama, za'a iya lura da wasu saurin sauri a cikin ɗan lokaci wanda ya haifar da hauhawar yanayin teku wanda ya haifar da ambaliyar manyan yankuna a Arewacin Amurka da Turai.
A wannan lokacin zamu iya yin nuni zuwa larduna biyu na tarihin rayuwa waɗanda suke cikin abin da muka sani a yau kamar Turai. Isaya an san shi da suna Tethys zuwa kudu da kuma wani boreal zuwa arewa. Dole ne a iyakance dukkan manyan murjani a lardin Tethys. Canjin canjin da ya wanzu tsakanin lardunan biyu ya kasance a cikin yankin da ke Yankin Iberiya a yanzu.
Bayanin yanayin kasa na zamanin Jurassic yana da kyau sosai, musamman a yammacin Turai. Kuma a cikin wannan ɓangaren nahiyoyin akwai jerin ruwaye masu yawa waɗanda ke nuna lokacin da yawancin nahiyar suka nitse a ƙarƙashin tekun masu zafi da zurfin zurfin ciki. Don shaharar da ke haskaka waɗannan yankunan da aka nutsar da ita an san ta da Tarihin Duniya na Jurassic Coast da lagerstätten na Holzmaden da Solnhofen.
Yanayin Jurassic
A wannan lokacin, shuke-shuke da suka saba da yanayi mai ɗumi sune suka bazu kusan ko'ina cikin ƙasar. Wadannan tsire-tsire sun sami damar fadada zuwa latti digiri 60. Duk biyun da suke mallakar kudancin Gondwana, arewacin Siberia sun haɗa da gungun fern da yawa waɗanda suka iya jure tsananin sanyi. A yau, dangin zamani na waɗannan ferns ba sa iya yin samfurin sanyi da ƙarancin yanayin zafi akai-akai.
Duk wannan kasancewar yanayin zafin rana ya haifar da cewa shimfidar yanayin Jurassic sun fi wadataccen ciyayi fiye da na Triassic. Musamman, akwai wadatattun ciyayi masu yawa a cikin tsaunuka masu tsayi. Tunda yana da zafi sosai kuma yanayi mai danshi ya ba da damar zuwa duk gandun daji, gandun daji da gandun dajin da suka samar da shimfidar wuri mai yawa yanayin fina-finan Jurassic ne. Wannan shine yadda dazuzzuka kuma suka fara yaduwa a duk faɗin duniya kuma iyalai kamar su conifers kama da pines da araucarias sun fita waje, tare da nau'ikan fern da dabino. Tabbas duk waɗannan shimfidar wurare cike da tsire-tsire na post zasu tuna da wasu finafinan Jurassic.
Flora da fauna
A lokacin zamanin Jurassic, flora yana da mahimmancin duniya, musamman a manyan tsaunuka. Ba wai kawai gandun daji na duniya masu cike da conifers da ferns sun yawaita ba, amma ginkgoes da dawakai ma sun kasance. A wannan lokacin, tsire-tsire waɗanda ke da inflorescences har yanzu ba su bayyana ba. Mun tuna cewa, har zuwa yanzu, tsire-tsire masu yaduwa a duniya suna cikin ƙungiyar motsa jiki, wato, waɗanda basu da furanni.
Bambance bambancen fure a cikin dukkanin yankin ƙasar yana nuna gaskiyar rabuwa da ya kasance tsakanin yankunan karkara da arewacin. Ci gaban bambance-bambancen mai rarrafe ya samo asali ne sakamakon kasancewar wasu shingaye na ruwa waɗanda suka wanzu tsakanin arewa da kudu. Wadannan shingayen ruwa an sanya su ta yanayin zafin yanayi mafi girma wanda ya tafi daga mafi yawan ɓangaren sandar zuwa Equator. Wadannan wadatattun zafin yanayin ba su yi tsayi kamar yadda suke a yau ba duk da cewa babu shaidar kankara a lokacin Jurassic. Wannan yana nufin cewa zato cewa yanayin zafi yayi yawa kuma shine dalilin yaduwar wannan nau'in shuke-shuke yana kara tabbatarwa.
Furen da yake nesa da mai kwatankwacin ya dace da shuke-shuke na yankuna masu yanayi kuma duk waɗannan shimfidar wurare na Jurassic an kira su da sunan Cycadophyta. Gandun dajin Ginkgo da conifers guda biyu sun manta da duk yanayin shimfidar wuri. Zamani ya kasance amma har yanzu shuke-shuke masu fure basu kasance. Hakanan ya kasance ga bishiyoyi masu katako.
Game da fauna, dinosaur sun bazu a kan sikeli na duniya a wannan lokacin, kasancewar su dabbobi da suka mamaye duniya a lokacin sauran lokacin.
Ina fatan cewa tare da wannan bayanin zaku iya koyo game da Jurassic.