Video: Nautilus fossils muaj hnub nyoog li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib tug tswv cuab ntawm tsev neeg cephalopod, Nautilus zoo li tus qwj ua luam dej nrog cov tentacles. Lub fossil nyob no tau hloov me ntsis yav dhau los 500 lab xyoo . Maj mam loj hlob thiab maj mam ua haujlwm, Nautilus tuaj yeem ua neej nyob tau 100 xyoo.
Raws li kev txheeb cais, cephalopod fossils hnub nyoog npaum li cas?
Cov qub shelled cephalopods tshwm sim rau thaum xaus ntawm lub sijhawm Cambrian (kwv yees li 500 lab xyoo dhau los) thiab qee qhov tseem muaj sia nyob niaj hnub no. Ammonites nyob hauv lub sijhawm Jurassic thiab Cretaceous (kwv yees li 200 lab rau 65 lab xyoo dhau los) thiab ploj mus ntawm qhov kev tshwm sim loj.
Tsis tas li ntawd, Nautilus puas cuam tshuam nrog ammonites? Cov nautilus thiab cov ammonite yog cov kab mob zoo sib xws. Ob leeg yog cov dej molluscs nrog kauv plhaub. Ammonites Txawm li cas los xij, tau ploj mus txij li qhov xwm txheej K-T uas tua cov dinosaurs 65 lab xyoo dhau los thaum lub sijhawm nautilus tseem roams dej hiav txwv.
Tom qab ntawd, thaum twg thawj ammonite fossil pom?
240 lab xyoo dhau los
Puas yog ammonite fossils tsim nyog nyiaj?
Cov tsiaj hiav txwv thaum ub tau ntaus pob ncaws pob ribbed spiral-form plhaub, thiab nyob nruab nrab ntawm 240-65 lab xyoo dhau los, thaum lawv raug tshem tawm nrog rau cov dinosaurs. Qhov no pob txha ntseeg tias nyob ib ncig ntawm 180 lab xyoo thiab tuaj yeem yog tsim nyog nyob ib ncig ntawm $ 3000 (£ 2, 200), txawm hais tias Mr Donne hais tias nws tsis yog muag.
Pom zoo:
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