Video: Yuav siv cov fossils index rau dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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.
Kuj kom paub yog, dab tsi yog qhov piv txwv fossils?
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).
Vim li cas index fossils muaj txiaj ntsig hauv kev sib tham sedimentary pob zeb txheej? Index cov pob txha yog pab tau vim lawv qhia cov txheeb ze muaj hnub nyoog pob zeb txheej nyob rau hauv uas lawv tshwm sim. Geologists siv qee hom kab mob, xws li trilobites, xws li index fossils.
Raws li txoj cai, dab tsi 3 cov txheej txheem tsim nyog rau pob txha pob txha los ua ib qho zoo index fossil?
Cov pob txha muaj txiaj ntsig zoo yuav tsum yog qhov sib txawv lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab luv luv. ntau dhau lub sijhawm. Index fossils yog lub hauv paus rau kev txhais cov ciam teb nyob rau hauv lub sij hawm geology thiab rau kev sib raug zoo ntawm strata.
Yuav ua li cas koj txheeb xyuas qhov index fossil?
Yuav suav tau ib index pob zeb , nws yuav tsum ua tau raws li 3 yam: Cov kab mob fossilized yuav tsum tau yooj yim pom. Nws yuav tsum yooj yim rau ID thiab saib tshwj xeeb. 2. Cov pob txha yuav tsum muaj thaj chaw dav dav, lossis pom nyob rau thaj chaw loj kom peb tuaj yeem siv lawv kom phim cov khaubncaws sab nraud povtseg los ntawm qhov deb loj.
Pom zoo:
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Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom
Dab tsi yog qhov index fossil Dab tsi yog ob qhov yuav tsum tau ua ib qho index fossil?
Cov pob txha muaj txiaj ntsig zoo yuav tsum yog qhov sib txawv lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab muaj ntau yam luv luv los ntawm lub sijhawm. Index fossils yog lub hauv paus rau kev txhais cov ciam teb nyob rau hauv lub sij hawm geology thiab rau kev sib raug zoo ntawm strata