Dab tsi ntawm fossil yog coral?
Dab tsi ntawm fossil yog coral?

Video: Dab tsi ntawm fossil yog coral?

Video: Dab tsi ntawm fossil yog coral?
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Corals tseem ceeb heev pob txha . Ntau coral muaj ib qho nyuaj exoskeleton ua los ntawm calcium carbonate. Nws yog qhov exoskeleton uas feem ntau yog fossilised. Thaum lub coral tuag, lub cev pob txha tuaj yeem tawg los ua limestone, lub tsev pob zeb tseem ceeb.

Tsis tas li ntawd, cov pob txha pob txha pom nyob qhov twg?

Lawv yog cov txheeb ze ze ntawm hiav txwv anemones thiab jellyfish thiab yog cov neeg tsim cov pob zeb loj hauv cov dej hiav txwv niaj hnub no. Corals tuaj yeem yog colonial lossis ib leeg. Raws li pob txha , coral yog pom thoob ntiaj teb nyob rau hauv sedimentary pob zeb.

Ib sab saum toj no, dab tsi yog cov pob txha loj tshaj plaws? Txog tam sim no feem ntau fossil , raws li tus naj npawb ntawm lub sij hawm nws tshwm sim nyob rau hauv collections, yog qwj Turritella, uas tsis yog tsuas yog pom yuav luag txhua qhov chaw txij li Cretaceous, tab sis feem ntau muaj ntau nyob rau hauv txhua sau.

Kuj tseem paub yog, nws siv sijhawm ntev npaum li cas rau coral mus fossilize?

Thaum prehistoric coral yog fossilized los ntawm kev hloov nrog agate, tus pob txha coral cov ntaub ntawv los ntawm hardened deposits tshuav los ntawm silica-nplua nuj dej. Cov tag nrho cov txheej txheem tau tshaj 20 lab lub xyoo thiab tshwm sim tsuas yog nyob rau hauv tshwj xeeb geological tej yam kev mob.

Hom fossils muaj nyob hauv Ohio?

Bryozoans yog common Ohio pob txha ntawm Ordovician hnub nyoog. Lwm yam xws li brachiopods, cephalopods, trilobites, horn corals, qwj, clams, echinoderms, thiab graptolites. Ohio yog qhuav av thaum lub sij hawm Early Silurian.

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