yog lub npe hu ua duck-billed dinosaurs ntawm Cretaceous. Lub neej nyob ntawm 75 txog 65 lab xyoo dhau los.
Hardrosaurs nyob qhov twg?
Nws nyob rau lub sijhawm Cretaceous thiab nyob North America. Nws cov pob txha tau pom nyob rau hauv qhov chaw xws li New Jersey, Montana thiab North Carolina. Cov lus tseeb ceev txog Hadrosaurus: Muaj los ntawm 85.8 lab xyoo dhau los rau Maastrichtian Hnub nyoog.
Hadrosaur nyob lub sijhawm twg?
Hadrosaurus nyob txog 80 lab xyoo dhau los lig nyob rau lub sijhawm Cretaceous. Hadrosaurus yog ib tug naas ej dinosaur vim hais tias nws yog ib tug tag nrho dinosaur skeleton unearthed nyob qhov twg nyob rau hauv lub ntiaj teb no thaum nws twb nrhiav tau thiab scientific ntaub ntawv nyob rau hauv 1858.
Thaum twg hadrosaurs tau ploj mus?
Cov kws tshawb fawb Spanish tau kawm txog cov ntaub ntawv fossil ntawm hadrosaurs, lub npe hu ua "duck-billed" dinosaurs, hauv Iberian Peninsula rau lub hom phiaj ntawm kev txiav txim siab tias lawv yog qhov kawg ntawm lawv hom nyob hauv Tebchaws Europe ua ntej ploj mus. thaum lub sij hawm K/T extinction tshwm sim uas tshwm sim 65.5 lab xyoo …
Thaum twg hadrosaur tshwm sim thawj zaug?
Cov dinosaurs thawj zaug tshwm sim kwv yees li 100 lab xyoo dhau los thaum nruab nrab Cretaceous Lub Sijhawmthiab suav tias yog ib pab pawg muaj kev vam meej tshaj plaws nyob rau hauv qhov kawg ntawm Cretaceous (Lucas, 2007).