puraavanaspati vigyaan

puraavanaspatti vigyaan (Paleobotany / palaeobotany) bhoovaijnyaaanik ateet ke paadapon se sambandhit vigyaan hai. yeh paadap jeevaashmon athva shailon mein surakshit paadap avasheshon par aadhaarit hai.

iske antargat un paudhon ka adhyayan kiya jaata hai, jo karodon varsh poorv pruthvi par rahate the, par ab kaheen naheen paae jaate aur ab fausil ban chuke hain. unke avashesh pahaad ki chattaanon, koyale ki khaanon ityaadi mein milte hain. chooainki paudhe ke sabhi bhaag ek se jude nahi milte, isaliye har ang ka alag alag naam diya jaata hai. inhein faurmajins kehte hain. puraane samay ke kaal ko bhoovaijnyaaanik samay kehte hain. yeh kainbriyn-poorv-mahaakalp se shuru hota hai, jo lagbhag paaainch arab varsh poorv tha. us mahaakalp mein jeevaanu shaivaal aur kavak ka janm hua hoga. doosra pailiyojoik kahalaata hai, jismein kareeb 60 karod se 23 karod varsh poorv ka yug sammilit hai. shuroo mein kuchh samudri paudhe, fir parnaharit, parnagaudbhid aur ant mein anaavrutabeeji paudhon ka janm hua hai. taduparaant madhyajeevi mahaakalp (Mesozoic era) shuroo hota hai, jo chhah karod varsh poorv samaapt hua. is kalp mein bade bade oonche, nukeeli patteevaale, anek anaavrutabeeji pedon ka saamraajya tha. jantuon mein bhi atyant bheemakaaya daainaasor aur bade bade saaainp ityaadi paida hue. seenaajoik kalp mein dviveeji, evam ekabeeji paudhe tatha stanadhaariyon ka janm hua.

inhein bhi dekhein