Thaum cov seem ntawm cov kab mob tuag tau tig mus rau pob zeb?

Cov txheej txheem:

Thaum cov seem ntawm cov kab mob tuag tau tig mus rau pob zeb?
Thaum cov seem ntawm cov kab mob tuag tau tig mus rau pob zeb?

Video: Thaum cov seem ntawm cov kab mob tuag tau tig mus rau pob zeb?

Video: Thaum cov seem ntawm cov kab mob tuag tau tig mus rau pob zeb?
Video: Tus Cawm Seej Hloov Neeg Txoj Hmoo (HD) 2024, Hlis ntuj nqeg
Anonim

Fossils nyob rau hauv Sedimentary Pob Zeb Feem ntau cov fossils tsim thaum cov kab mob tuag tau faus rau hauv cov pob zeb. Cov txheej ntawm sediment maj mam tsim. Lub sediment yog faus thiab hloov mus rau hauv sedimentary pob zeb. Cov seem hauv pob zeb kuj tig mus rau pob zeb.

Thaum cov no ua cemented rau hauv pob zeb qhov tshwm sim fossil hu ua a?

Sediment Ib hom pob zeb uas tsim thaum cov khoom los ntawm lwm cov pob zeb lossis cov seem ntawm cov nroj tsuag thiab tsiaj txhu raug nias thiab cemented ua ke. Pwm. Ib hom pob txha tsim thaum lub plhaub lossis lwm qhov nyuaj ntawm lub cev yaj, tawm hauv qhov chaw khoob ntawm cov duab.

Yuav ua li cas thaum lub cev tuag thiab npog hauv av?

Thaum lub cev tuag thiab muab faus rau hauv cov av, cov khoom uas ua rau lub cev tawg. Thaum kawg, tsuas yog carbon tseem nyob.

Lub tswv yim ntawm lub cev hauv pob zeb hu ua dab tsi?

Fossils kuj tsim los ntawm pwm thiab cam khwb cia. Yog hais tias ib tug kab mob tag nrho dissolves nyob rau hauv sedimentary pob zeb, nws muaj peev xwm tawm ib tug impressions ntawm nws sab nrauv nyob rau hauv lub pob zeb, hu ua an lwm pwm. Yog tias pwm ntawd tau ntim nrog lwm cov ntxhia, nws dhau los ua cov cam khwb cia.

Thaum cov ntxhia tau ua kom tawv rau hauv pob zeb tsim pob txha Cov pob txha hu ua?

Daim duab 11.4: Coprolite (fossilized khib nyiab lossis quav) los ntawm cov nqaij noj dinosaur. Cov txheej txheem ntawm ib zaug uas muaj sia nyob dhau los ua pob txha hu ua fossilization Fossilization yog ib txoj kev tsis tshua muaj: ntawm tag nrho cov kab mob uas tau nyob hauv ntiaj teb, tsuas yog ib feem me me ntawm lawv puas tau ua pob txha.

Pom zoo: