Yog li lawv yog cov pob txha tiag tiag es tsis yog cov kab mob pob txha. Lawv kuj zoo kawg li vim lawv record thawj qhov tseem ceeb thiab khaws cia tshwm sim ntawm lub neej hauv ntiaj teb, thiab tseem tab tom tsim niaj hnub no, hla ntau tshaj 3 billion xyoo ntawm geological keeb kwm.
Puas yog stromatolites taug cov pob txha?
Vim li no, zoo li txoj kev taug, txoj kev, lossis burrow khaws cia nyob rau hauv ib qho av av thaum ub, stromatolites raug cais raws li taug qab fossils, organosedimentary cov qauv uas pov thawj kev ua haujlwm biologic tseem yog lawv tus kheej tsis muaj kab mob fossilized..
hom fossilized yog stromatolites?
Stromatolites yog cov pob txha txawv txawv uas nws lub hauv paus chiv keeb tau sib cav txog txij li ob peb xyoos dhau los. Niaj hnub no, cov kws tshawb fawb feem ntau pom zoo tias stromatolites yog txheej txheej colonial feem ntau tsim los ntawm cyanobacteria.
Dab tsi tshwj xeeb txog stromatolites?
Stromatolites yog tshwj xeeb thiab tshwj xeeb hom reef. Tsis zoo li feem ntau niaj hnub reefs, uas yog tsim los ntawm coral, stromatolites yog tsim los ntawm cov kab mob. Cov yam ntxwv ntawm cov microbial reefs yog cov txheej txheem sab hauv - qhov tseeb, 'stromatolite' yog muab los ntawm Greek lub ntsiab lus 'pob zeb txheej'.
Hom fossil twg suav tias yog pob txha pob txha?
Nkag, burrows, qe, zes, hniav cim, gastroliths (gizzard pob zeb), thiab coprolites (fossilfeces) yog cov piv txwv ntawm cov pob txha pob txha lossis ichnofossils. Trace fossils sawv cev rau cov haujlwm uas tshwm sim thaum tus tsiaj muaj sia nyob. Yog li, cov pob txha pob txha tuaj yeem muab cov lus qhia rau kev noj haus thiab kev coj cwj pwm.
