Fossils yog tsim nyob rau hauv ntau txoj kev, tab sis feem ntau yog tsim thaum ib tsob nroj los yog tsiaj tuag nyob rau hauv ib tug watery ib puag ncig thiab faus rau hauv av nkos thiab silt. Cov ntaub so ntswg sai sai decompose tawm hauv cov pob txha tawv los yog plhaub tom qab. Sij hawm dhau mus sediment ua rau saum toj thiab hardens rau hauv pob zeb.
Cov pob txha loj tshaj plaws nyob qhov twg?
Fossils feem ntau pom nyob qhov twg cov pob zeb sedimentary ntawm lub hnub nyoog raug - uas rau dinosaurs yog Mesozoic - raug nthuav tawm. Qhov chaw zoo tshaj yog kwj hav dej, pob tsuas thiab hillsides, thiab tib neeg tsim tawm xws li quarries thiab kev txiav.
3 txoj kev pob txha yog dab tsi?
Qhov muaj feem yuav ua pob txha pob txha yog txhim kho los ntawm kev faus neeg sai thiab muaj qhov ruaj khov, xws li pob txha lossis plhaub. Fossils tsim nyob rau hauv tsib txoj kev: preservation ntawm qub seem, permineralization, pwm thiab casts, hloov, thiab compression.
pob txha pob txha nyob qhov twg?
Fossils pom yuav luag tshwj xeeb hauv pob zeb sedimentary -pob zeb uas tsim thaum xuab zeb, silt, av nkos, thiab cov khoom organic tawm hauv dej los yog huab cua los ua cov txheej txheem uas tom qab ntawd compacted. mus rau pob zeb.
7 hom pob txha yog dab tsi?
Txhua yam ntawm lawv sib txawv…
- Petrified fossils: …
- Moulds fossils: …
- Casts fossils: …
- Carbon films: …
- Preserved seem:
- Trace fossils:
