Video: Dab tsi yog qhov index fossil Dab tsi yog ob qhov yuav tsum tau ua ib qho index fossil?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Ib qho tseem ceeb index pob zeb yuav tsum muaj qhov tshwj xeeb lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab ib qho luv luv los ntawm lub sijhawm. Index cov pob txha yog lub hauv paus rau kev txhais ciam teb nyob rau hauv lub sij hawm geological scale thiab rau correlation ntawm strata.
Ib yam li ntawd ib tug yuav nug, yuav ua li cas yog ib qho index fossil siv?
Index cov pob txha (tseem hu ua phau ntawv qhia pob txha los yog qhov taw qhia pob txha ) yog fossils siv los txhais thiab txheeb xyuas lub sijhawm geological (los yog theem faunal). Index cov pob txha yuav tsum muaj ib tug luv ntsug ntau yam, dav geographic faib thiab ceev evolutionary tiam sis.
Ib yam li ntawd, koj ua li cas txheeb xyuas qhov index fossil? Txheeb xyuas Index Fossils
- Lawv paub tias nws muaj hnub nyoog tib yam li lwm cov pob zeb txheej uas muaj tib lub pob txha pob txha.
- * Cov pob txha pob txha yuav tsum tau nyob rau lub sijhawm luv luv ntawm ntau qhov chaw.
- Yog tias geologists txheeb xyuas cov pob txha pob txha nyob rau hauv cov pob zeb txheej, lawv tuaj yeem paub tseeb txog hnub nyoog ntawm cov pob zeb txheej uas nws tau pom.
Tsis tas li ntawd, dab tsi yog qhov piv txwv ntawm ib qho index fossil?
Index cov pob txha feem ntau pom, dav dav pob txha uas yog txwv nyob rau hauv lub sij hawm ncua. Piv txwv ntawm index fossils suav nrog: Ammonites tau tshwm sim thaum Mesozoic Era (245 txog 65 mya), Lawv tsis pom tom qab lub sijhawm Cretaceous, raws li lawv tau ploj mus thaum lub sijhawm K-T extinction (65 mya).
Dab tsi yog qhov index fossil rau menyuam yaus?
Index fossils (los yog zone fossils) yog cov pob txha siv los txhais thiab txheeb xyuas lub sijhawm geological (los yog theem faunal). Lawv ua haujlwm ntawm qhov chaw uas txawm hais tias cov sediments sib txawv yuav zoo li txawv nyob ntawm seb lawv tau muab tso rau hauv, lawv tuaj yeem suav nrog seem ntawm tib hom fossil.
Pom zoo:
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Dab tsi yog qhov tseem ceeb ntawm qhov index fossil?
Index fossils yog siv los ntawm ob qho tib si geologists thiab paleontologists los kawm txog pob zeb thiab hom ntawm yav dhau los. Lawv pab muab lub hnub nyoog txheeb ze rau cov txheej pob zeb thiab lwm cov pob txha pom nyob hauv tib txheej