"Boqor sanka?". Waa magaca loo bixiyay hadrosaur dhawaan la helay oo leh magaca sayniska ee Rhinorex condrupus. Waxay daawatay dhirta Cretaceous ee la soo dhaafay qiyaastii 75 milyan oo sano ka hor.
Si ka duwan noocyada kale ee hadrosaurs, Rhinorex madaxiisa kuma lahayn lafo ama maqaar jilicsan. Taa beddelkeeda, waxay lahayd san weyn. Sidoo kale, laguma helin dhagax yar sida hadrosaurs-ka kale, laakiin waxaa laga helay Jaamacadda Brigham Young oo ku taal khaanad qol dambe ah.
Tobanaan sano, ugaarsatada fosil-ka dinosaur-ku waxay ku guda jireen shaqadooda iyagoo isticmaalaya pick iyo majarafad, mararka qaarna dynamite. Waxay jari jireen oo qarxin jireen dhagaxyo badan xagaaga kasta, iyagoo raadinaya lafo. Shaybaarrada jaamacadda iyo matxafyada taariikhda dabiiciga ah oo ay ka buuxaan qalfoofyo dinosaur ah oo qayb ahaan ama dhammaystiran. Qayb muhiim ah oo fosil-ka ah, si kastaba ha ahaatee, waxay ku jiraan sanduuqyo iyo weelal nuurad ah oo lagu shubay weelasha kaydinta. Lama siin fursad ay ku sheegaan sheekooyinkooda.
Xaaladdani hadda way is beddeshay. Qaar ka mid ah khubarada cilmiga paleontolojiga ayaa ku tilmaamay sayniska dinosaur-ka inuu marayo dib-u-soo-noolayn labaad. Waxay ula jeedaan waa in habab cusub la qaadayo si loo helo faham qoto dheer oo ku saabsan nolosha iyo waqtiyada dinosaur-ka.
Mid ka mid ah hababka cusub waa in si fudud loo eego waxa hore loo helay, sida kiiska Rhinorex.
Sannadihii 1990-meeyadii, fosil-ka Rhinorex waxaa lagu kaydiyay Jaamacadda Brigham Young. Waqtigaas, khubarada cilmiga paleontologists waxay diiradda saareen sawirrada maqaarka ee laga helo lafaha jirridda hadrosaur, iyagoo waqti yar u daayay qalfoofyada qalfoofka ah ee weli ku jira dhagaxyada. Kadib, laba cilmi-baare oo ka tirsan jaamacadda ayaa go'aansaday inay eegaan qalfoofka dinosaur-ka. Laba sano ka dib, Rhinorex ayaa la helay. Dhakhaatiirta cilmiga paleontologists waxay iftiimin cusub ku hayeen shaqadooda.
Rhinorex waxaa markii hore laga qoday aag Utah ah oo la yiraahdo goobta Neslen. Saynisyahannadu waxay sawir cad ka haysteen deegaanka goobta Neslen ee waagii hore. Waxay ahayd deegaan estuarine ah, dhul hoose oo qoyan oo biyaha cusub iyo kuwa milixda leh ay isku qasan yihiin meel u dhow xeebta bad qadiimi ah. Laakiin gudaha, oo 200 mayl u jirta, dhulku aad buu uga duwanaa. Hadrosaurs-ka kale, nooca crested, ayaa laga qoday gudaha dhulka. Maadaama saynisyahannadii hore ee palenontologists-ku aysan baarin qalfoofka Neslen oo dhan, waxay u maleeyeen inuu sidoo kale ahaa hadrosaur crested ah. Natiijo ahaan, gabagabadii waxaa la gaaray in dhammaan hadrosaurs-ka crested ay si siman uga faa'iideysan karaan kheyraadka gudaha iyo estuarine. Ma ahayn ilaa khubarada palenotists ay dib u eegeen inay dhab ahaantii ahayd Rhinorex.
Sida gabal xujo ah oo meesha ku dhacaysa, ogaanshaha in Rhinorex uu ahaa nooc cusub oo ka mid ah nolosha Cretaceous ee Dambe. Helitaanka "Boqorka Sanka" waxay muujisay in noocyada kala duwan ee hadrosaurs ay la qabsadeen oo ay horumareen si ay u buuxiyaan meelo kala duwan oo deegaanka ah.
Iyagoo si dhow u eegaya fosil-ka ku jira weelasha kaydinta boodhka leh, khubarada paleontologists waxay helayaan laamo cusub oo geedka nolosha ee dinosaur-ka.
——— Laga soo bilaabo Dan Risch
Waqtiga boostada: Febraayo-01-2023