1. Sandstone thiab Limestone: Ntau hom pob zeb
Sandstone thiab limestone yog cov pob zeb sib txawv, txhua tus muaj lawv tus kheej cov yam ntxwv thiab cov khoom. Thaum ob qho tib si pib los ntawm sedimentary deposition, lawv txawv ntawm lawv cov muaj pes tsawg leeg, kev ntxhib los mos, thiab xim. Piv txwv li, thaum sandstone yog tsim los ntawm cov xuab zeb loj ntawm cov ntxhia, pob zeb, lossis cov khoom siv organic. Limestone, ntawm qhov tod tes, yog pob zeb pob zeb uas muaj cov pob zeb uas muaj carbonate zoo li calcite lossis aragonite.
2. Qhov txawv thiab zoo sib xws
Txawm hais tias yog ob hom pob zeb sedimentary, Sandstone thiab limestone muaj qee qhov sib xws. Ob leeg yog tsim los ntawm tib cov txheej txheem ntawm sedimentation, nyob rau hauv uas sediment accumulates nyob rau hauv lub sij hawm thiab yog cemented ua ke los tsim ib lub pob zeb. Txawm li cas los xij, lawv txawv ntawm lawv cov ntxhia muaj pes tsawg leeg, nrog cov xuab zeb feem ntau yog nplua nuj hauv av nplaum thiab limestone yog nplua nuj nyob rau hauv carbonate minerals.
3. Yuav Ua Li Cas Qhia Sandstones los ntawm Limestone
Yog tias koj tab tom sim txheeb xyuas lub pob zeb li sandstone lossis limestone, muaj ob peb qhov sib txawv tseem ceeb los nrhiav. Ib qho ntawm qhov sib txawv tshaj plaws yog xim, nrog cov xuab zeb feem ntau yog tsaus thiab ntau dua grey lossis ntsuab lossis liab lossis daj hauv qhov tsos, thaum limestone feem ntau sib dua ntawm cov xim thiab tej zaum yuav muaj cov fossil txawv. Tsis tas li ntawd, Sandstone zoo li softer thiab tsawg dua li limestone, thiab tej zaum yuav hnov ntau crumbly los yog powdery rau qhov kov. Thaum kawg, sandstone feem ntau cuam tshuam nrog thaj chaw qis qis lossis thaj chaw swampy, thaum limestone tuaj yeem pom nyob hauv ntau qhov chaw sib txawv, los ntawm pob tsuas thiab roob mus rau hauv av qhov tsua.
