Inkathi yamaDinosaurs nokwehlukana kwawo efika emhlabeni
Amadinosaurs okuqala aziwayo avela ngesikhathi seTriassic Period (cishe izigidi ezingu-250 kuya kwezingu-200 ezedlule). Ama-Dinosaurs aguquke aba yiqembu elihluke kakhulu lezilwane ezinezici eziningi ezibonakalayo, kuhlanganise nezinyoni zesimanje.
Ngokuphambene nalokho abantu abaningi abakucabangayo, akuwona wonke amadinosaurs ayephila ngesikhathi esifanayo sokwakheka komhlaba. UStegosaurus, isibonelo, wayephila ngesikhathi seLate Jurassic Period, cishe eminyakeni eyizigidi ezingu-150 edlule.
ITyrannosaurus Rex yayiphila ngesikhathi seLate Cretaceous Period, cishe eminyakeni eyizigidi ezingu-72 edlule. IStegosaurus yaphela iminyaka eyizigidi ezingu-66 ngaphambi kokuba iTyrannosaurus ihambe emhlabeni.
Phakathi neMesozoic Era (inkathi yeminyaka engaphezu kwezigidi ezingu-180 ehlanganisa izikhathi zeTriassic, Jurassic, neCretaceous), uhlobo lwedinosaur engeyona i-avian lwashintsha lwaba uhlobo lwedinosaur yezinyoni. Le dinosaur yezinyoni iyinyoni yokuqala futhi engaphambi kwazo zonke izinyoni. Yonke idinosaur engeyona eyezinyoni yashabalala eminyakeni eyizigidi ezingu-66 edlule. Kunemibono eminingana mayelana nokuthi yini okungenzeka ibe nomthelela ekuqothulweni okukhulu kwezibankwakazi ezingezona izinyoni nezinye izinhlobo zezilwane ekupheleni kweNkathi Yokubusa.
Kuqinisekile ukuthi i-asteroid enkulu noma inkanyezi enomsila yahlasela uMhlaba phakathi nalesi sikhathi, okwabangela ukushintsha okumangalisayo kwesimo sezulu soMhlaba.
Abanye ososayensi baqagela ukuthi lo mthelela ube nemiphumela eyinhlekelele empilweni yasemhlabeni. Kodwa ezinye izici, ezihlanganisa ukushintsha kwamazinga olwandle kanye nezintaba-mlilo ezinkulu, kungenzeka ukuthi nazo zibambe iqhaza elikhulu kulokhu kushabalala okukhulu.
Izinsalela zeDinosaur kanye neFossilization
Izazi ze-paleontology zisebenzisa ubufakazi bezinsalela ezigcinwe edwaleni lasendulo ukuze zithole ukuthi izilwane ezanyamalala isikhathi eside zaziphila futhi ziziphathe kanjani.
Ezimweni eziningi, ithambo eliyinsalela empeleni liyidwala elenziwe ngamaminerali, elingenawo nomkhondo wethambo lokuqala.
Ukutholakala kwamaqanda ezibankwakazi nezidleke kwanikeza ubufakazi bokuziphatha kwamanye ama-dinosaurs.
Ngokuqhathanisa ugebhezi lwekhanda lwama-Protoceratops eminyaka ehlukene (njengasesithombeni esingenhla), izazi ze-paleontology zingafinyelela iziphetho mayelana nendlela amanye ama-dinosaurs akhula ngayo.
Ukuze zithole ukuthi izinto eziphilayo zaziphila kanjani esikhathini esidlule, izazi ze-paleontology zifuna imikhondo egcinwe emadwaleni asendulo—amathambo agugelwe phansi, amazinyo, amaqanda, imilobo yezinyawo, izimpawu zamazinyo, amaqabunga ngisho nobulongwe bezinto eziphilayo zasendulo.
Izinsalela zemihlathi, amazinyo, nobulongwe kunikeza imikhondo ebalulekile mayelana nokuthi izibankwakazi ezingezona ezezinyoni zazidlani.
Uchungechunge lwezinyathelo zezinyawo ezinezinsalela ezimbiwa phansi, ezibizwa ngokuthi ama-trackways, luveza ubufakazi obuthakazelisayo mayelana nokuziphatha kwama-dinosaur nokuhamba.
Kuze kube muva nje bekukholelwa ukuthi izimpaphe zingezozinyoni kuphela. Okutholwe muva nje, nokho, kuveze ubufakazi bama-dinosaur angewona awezinyoni anezimpaphe.
Izazi ze-paleontologists ezifuna izinsalela zama-dinosaur ziqala umsebenzi wazo ngokuhlola izindawo ukuze zithole amatshe angcolile kusukela enkathini ye-Mesozoic. Ukuthola indawo efanele kudinga ulwazi kanye neso elibukhali.
Umsebenzi wasensimini uyingxenye encane yalokho okwenziwa yizazi ze-paleontologists. Baphinde basebenze elebhu, behlola ama-specimens abawatholile kanye nezinsalela ezaqoqwa eminyakeni edlule. Bachitha isikhathi esiningi behlukanisa izibonelo, behlola izici zabo, futhi bethola ubudlelwano babo bemvelo.