
hoback roopeekaranam

hoback thadathinullil (pacha nadeethadatthinu nere vadakku) sthithi cheiyunna padinjaaran-madhya vyomingile oru bhoomishaasthraparamaaya roopeekaranamaanu hoback roopeekaranam. laramide oorojeniyil ninnulla vardhicha avashishta nirakkinte falamaayi ithu roopappedukayum aadyakaala eosene kaalaghattatthil paliyojen kaalaghattatthinte avasaanathil ninnulla fossilukal samrakshikkukayum cheiyunnu.
dhaaraalam kalkari, carbonatius sheyil, phoosil cheytha sasya avashishtangal enniva soochippikkunnathupole, eerppamulla kaalaavasthayil vanapradeshathe vellapokka samathalathilaan hoback roopeekaranam roopappettathennu karuthappedunnu. nireekshicha pala kidakkakalum mangiya niramullavayaanu, ithu avaa kurayunna anthareekshathil roopappettathaayi soochippikkunnu-varshathinte ganyamaaya bhaagath vellam, vellam niranja mannu enniva undakumennathinaal vellapokka samathala nikshepa paristhithiyude mattoru adayaalam. oru valia aruviye prathinidheekarikkunnuvennu karuthappedunna oru pramukha manalkkall mukhangal (cross bedding, overbank nikshepangal, valia kallukal nikshepangal ennivayulla) roopeekaranathinte bhooribhaagavum undu.
hoback roopeekaranathil kaanapedunna phosilukalil asthi sakalangal, amakal, valia sasthanikal, molaskkukal, skeyilukal, malsya pallukal, vaividhyamaarnna phoosil cheytha sasya vasthukkal (phoosil cheytha thadi ulppede) enniva ulppedunnu. aadyakaala senosoic muthalakalude lakshanangalum kandethiyittundu.

