Vim tias lawv hloov zuj zus sai, thiab moulted zoo li lwm cov arthropods, trilobites ua haujlwm zoo tshaj plaws fossils, ua rau cov kws tshawb fawb txog hnub nyoog ntawm cov pob zeb uas lawv pom.
Yuav ua li cas hom trilobite siv los ua ib qho index fossil?
Evolution nyob rau hauv ib pab pawg neeg Tracemakers: 'Cruziana' Biostratigraphy. Trilobites yog ib qho tseem ceeb index fossils los ntawm ntau ntawm Paleozoic, thiab lawv evolution yog mirrored, mus rau ib tug txo qis, nyob rau hauv cov ntaub ntawv stratigraphic ntawm trilobite-tsim kab mob fossils.
Puas muaj pob txha yog pob txha pob txha?
Index fossil, ib yam tsiaj lossis tsob nroj khaws cia hauv cov ntaub ntawv pob zeb ntawm lub Ntiaj Tebuas yog tus yam ntxwv ntawm lub sijhawm tshwj xeeb ntawm geology lossis ib puag ncig. Cov pob txha pob txha muaj txiaj ntsig yuav tsum yog qhov sib txawv lossis pom tau yooj yim, muaj ntau, thiab muaj qhov dav ntawm thaj chaw faib khoom thiab ntau yam luv luv los ntawm lub sijhawm.
Yuav ua li cas cov pob txha yuav phem index fossils?
Birds, piv txwv li, yuav ua rau cov fossils phem, vim hais tias txawm hais tias muaj ntau hom uas muaj qhov dav (qhov tseeb intercontinental), lawv fossilize tsis zoo: lawv cov pob txha tuaj sib nrug. yooj yim, thiab tom qab ntawd lawv cov pob txha mos honeycombed muaj qhov cuam tshuam rau kev lwj.
hom tsiaj twg ua pob txha zoo?
Trilobites ua haujlwm zoo li fossils zoo, cia cov kws tshawb fawb pom hnub nyoog ntawm cov pob zeb uas lawv nyob hauv.
