Video: Lub plhaub ntawm pob zeb hu ua dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Coquina (/ko?ˈkiːn?/) yog sedimentary pob zeb uas yog tsim los ntawm tag nrho los yog yuav luag tag nrho ntawm cov thauj, abraded, thiab mechanically-sorted fragments ntawm lub plhaub ntawm mollusks, trilobites, brachiopods, los yog lwm yam invertebrates. Lo lus coquina los ntawm lo lus Spanish rau "cockle" thiab "shellfish".
Tsis tas li ntawd, dab tsi yog lub plhaub hu ua lo rau pob zeb?
Cov limpet feem ntau yog ua los ntawm lub khob hliav qab uas muaj zog heev plhaub thiab ib lub cev nqaij mos nyob hauv. Tag nrho cov seem hauv qab ntawm lawv lub cev muaj qhov loj 'ko taw' uas lawv siv los tiv thaiv lawv tus kheej pob zeb.
Tsis tas li ntawd, lub pob zeb ua los ntawm cov plhaub thiab coral cemented ua ke hu ua dab tsi? Coquina ("co-keen-ah"): Ib tug sedimentary pob zeb muaj xws li xoob-consolidated fragments ntawm plhaub thiab/los yog coral . Matrix los yog " cement ” consolidating cov fragments feem ntau yog calcium carbonate los yog phosphate. Coquina tsim nyob rau hauv ib puag ncig ze ntawm ntug dej, xws li marine reefs.
Hais txog qhov no, lub plhaub puas yog pob zeb?
Coquina yog ib tug sedimentary pob zeb ua los ntawm seashells. Cov plhaub yog tsim los ntawm cov zaub mov tab sis lawv tsis yog cov zaub mov. Coal yog suav tias yog ib pob zeb tab sis nws tsis yog ua los ntawm cov zaub mov nws los ntawm cov organic teeb meem nroj tsuag. Ob qhov kawg no hu ua biogenic pob zeb.
Dab tsi yog qhov txawv ntawm lub barnacle thiab lub limpet?
Barnacles thiab limpets (pom hauv qab no) muaj ntau qhov zoo sib xws: ob qho tib si yog cov tsiaj me me nrog lub plhaub conical thiab tuaj yeem pom hauv dej hiav txwv ntawm ntug dej hiav txwv. Barnacles muaj lub cev layout ntawm ib tug cw. Limpets muaj lub cev layout ntawm ib tug qwj.
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