A Mesozoic zamanin

A Mesozoic zamanin da aka dauke a matsayin tsaka-tsakin mataki a cikin ci gaban da duniyar tamu. Wasu geologists kira shi "mai nazarin halittu da kuma ma'aunan kasa tsakiyar zamanai."

A Mesozoic zamanin fara a karshen Variscan (Variscan) na dutsen-ginin tafiyar matakai, da kuma kare - da farkon mai tsayi nadawa (da karshe manyan tectonic juyin juya halin).

A kudancin Hemisphere, shi ƙare a tsaga na zamanin d nahiyar Gondwana. A general, rayuwa a cikin Mesozoic zamanin halin zumunta kwantar da hankula. dutsen gini matakai sun rare da short-rayu.

A Mesozoic Era dade kamar miliyan 160. Years.

Daga mai nazarin halittu ra'ayi, wannan zamanin ne a lokacin mika mulki daga m, tsohon siffofin da mafi m sabon. Duniya a wannan lokaci da yawa more bambancin fiye da a cikin Paleozoic, da Flora da fauna da aka muhimmanci kyautata.

Mesozoic Era. lokaci

Akwai matakai uku a cikin wannan zamanin.

A farko - cikin Triassic - don haka mai suna saboda da cewa ya adibas jera tsakanin uku daban-daban jinsunan hadaddun. Wadannan sun hada da neyper - babba calcareous - matsakaici nahiyar sandstone - ƙananan. Mai hankula ne nahiyar yashi-lãka dutse (sau da yawa tare da carbon ruwan tabarau), shale, marine farar ƙasa, gypsum, salts, anhydrides tafasan.

A Triassic fili ya kudancin nahiyar (Gondwana) da arewacin nahiyar (Laurasia). Tare da wadannan canje-canje a cikin rarraba ƙasa da tẽku, dutsen gini, da samuwar sabuwar volcanic yankunan, ya faru quite hanzari da kuma sabunta Flora da fauna. Duk da haka, kawai 'yan jinsuna sun koma daga Paleozoic zuwa Mesozoic. Kamar yadda masu bincike, wadannan dalilai ne sakamakon manyan-sikelin bala'i da cewa sun faru a kan iyakar epochs.

A na gaba mataki, wanda ya hada da Mesozoic zamanin - da Jurassic. Yana fara game da 200 da kuma ƙare game da 145,5 miliyan. Shekaru da suka wuce. Jurassic lokaci ya zama daya daga cikin shahararrun lokaci a ci gaba na duniya.

A wannan lokaci, da mafi yadu amfani a cikin shuke-shuke samu gymnosperms da ferns. An zaci cewa da muhalli da yanayi sun yi kama da yanayi na Carboniferous lokaci, don haka kamar yadda muka gani m char samuwar. Wanzu a Permian, Triassic fara crack a cikin tsarin na wata babbar nahiyar ci gaba da lalata. Wannan tsari yana da wani gagarumin tasiri a kan teku igiyoyin, ruwan sama, da sauyin yanayi da kuma yanayi na zama na kwayoyin a general.

A Jurassic lokacin an dauke "lokacin dabbobi masu rarrafe." A ƙasar da aka sanaki dinosaur. A tekuna rayu plesiosaurs da ichthyosaurs, a cikin iska - da pterosaurs. Daga cikin dinosaur fara samar da giant jinsunan. Tare da wannan, akwai kananan carnivorous pterodaktili. A ƙarshen Jurassic lokaci, shi ya fara jari na iko, hanyõyi yadudduka farar ƙasa - alli. Saboda haka, wani sabon mataki.

A farkon na Cretaceous lokaci ne halin da wasu daga cikin manyan abubuwan da suka faru a cikin samuwar kwayoyin duniya. A wannan lokaci ya fara bayyana farko flowering shuke-shuke, burbushin wanda aka gabatar a itace da kankara ganye, girma, da kuma a yau (misali, Elm, itacen oak, Willow, Maple). A fauna a cikin Cretaceous lokaci ne ma kama da daya da cewa ya samo asali a cikin Jurassic lokaci.

A karshen wannan lokaci da aka halin tsanani orogeny (dutsen gini) a East Asia, Arewacin da kuma Kudancin Amirka. Sedimentary kankara sun tara a cikin Andean geosyncline a lokacin da dama lokaci, compacted kuma crumpled cikin folds. Kamar wancan kafa Andes.

volcanic aiki ya karu a yankuna da dama na duniya. A gaba dayan kudancin India sashin da aka rufe lawa (haka kafa manyan tudu "Dean"). A ƙarshen Mesozoic zamanin a kan dukkan nahiyoyi suka gagarumin karfafa.