"Boqor sanka?". Kaasi waa magaca loo bixiyay hadrosaur dhawaan la helay oo leh magaca sayniska ee Rhinorex condrupus. Waxay baadhisay dhirtii Cretaceous dambe 75 milyan oo sano ka hor.
Si ka duwan hadrosaurs kale, Rhinorex ma lahayn lafo ama qolof leh madaxiisa. Taa beddelkeeda, waxay ku ciyaareysay san weyn. Sidoo kale, waxa aan laga helin meel dhagax ah sida hadrosaurs kale, laakiin waxa laga helay Jaamacadda Brigham Young oo ku taal shelf qolka dambe.
Muddo tobanaan sano ah, ugaarsadaha lafo dinosaurka ah waxay ku wadeen hawlahooda iyagoo qaadaya iyo majarafad iyo marmarka qaarkood firfircoon. Xagaa kasta way jeexjeexi jireen oo qarxin jireen tan oo dhagax ah, iyagoo lafo raadinaya. Shaybaarada jaamacadda iyo matxafyada taariikhda dabiiciga ah oo ay ka buuxaan qalfoofka dinosaur qayb ahaan ama dhamaystiran. Qayb muhiim ah oo ka mid ah fossils, in kastoo, ay ku sii jiraan sanduuqyo iyo kabadaha balastarrada lagu shubay ayaa lagu daadiyay weelasha kaydinta. Lama siin fursad ay ku sheegaan sheekadooda.
Xaaladani hadda way is bedeshay. Qaar ka mid ah cilmi-baarayaasha paleontologists waxay ku tilmaamaan sayniska dinosaurka inuu marayo dib u soo noolayn labaad. Waxa ay ula jeedaan waa in habab cusub loo qaaday si loo helo aragti qoto dheer oo ku saabsan nolosha iyo waqtiyada dinosaurs.
Mid ka mid ah hababkaas cusub ayaa ah in si fudud loo eego waxa horay loo helay, sida kiiska Rhinorex.
Sanadihii 1990-aadkii, fossils of Rhinorex waxaa lagu xareeyay Jaamacadda Brigham Young. Waqtigaas, paleontologists waxay diiradda saareen dareenka maqaarka ee laga helay lafaha jirridda hadrosaur, iyaga oo waqti yar uga tagaya qalfoofka lafo-beelka ee weli ku jira dhagaxyada. Kadib, laba cilmi-baarayaal postdoctoral ayaa go'aansaday inay eegaan madaxa dinosaurka. Laba sano ka dib, Rhinorex ayaa la helay. Dhakhaatiirta Paleontologists waxay iftiiminayeen iftiin cusub shaqadooda.
Rhinorex ayaa markii hore laga soo qoday aagga Utah oo la yiraahdo goobta Neslen. Cilmi-yaqaannada Geology-ga waxay sawir cad ka heleen goobta Neslen ee bey'adda waa hore. Waxay ahayd deegaan esturine ah, dhul hoose oo bogaag ah halkaas oo ay biyaha cusbo iyo cusbadu isku darsameen ee u dhow xeebta bad qadiimi ah. Laakiin gudaha, 200 mayl u jirta, dhulku aad buu u kala duwanaa. Hadrosaurs kale, oo ah nooca crested, ayaa laga soo qoday gudaha gudaha. Sababtoo ah cilmi-baarayaasha hore ee palenontologists ma aysan baarin qalfoofka Neslen oo dhammaystiran, waxay u malaynayeen inay sidoo kale ahayd hadrosaur-jilicsan. Natiijadii malo-awaalkaas, gunaanadkii waxaa la soo saaray in dhammaan hadrosaur-yada la aaminsan yahay ay si isku mid ah uga faa'iidaysan karaan kheyraadka gudaha iyo kuwa estuarine. Ma ahayn ilaa ay dhakhaatiirta palenotologists dib u baareen in ay dhab ahaantii ahayd Rhinorex.
Sida gabal xujo ah oo meel ku dhacay, ogaanshaha in Rhinorex uu ahaa nooc cusub oo nolosha Cretaceous ah. Helitaanka "King Sanka" waxay muujisay in noocyada kala duwan ee hadrosaurs ay la qabsadeen oo ay u kobceen si ay u buuxiyaan meelo kala duwan oo deegaanka ah.
Iyaga oo si fudud u eegaya lafaha ku jira haamaha kaydinta boodhka leh, cilmi-baarayaasha paleontologists waxay helayaan laamo cusub oo geedka dinosaurka ah ee nolosha.
——— Ka Dan Risch
Waqtiga boostada: Febraayo-01-2023