
mulde paripadi

silurian kaalaghattatthile thaarathamyena cheria moonnu kootta vamshanashangalil (irivikkan, mulde, lau evantukal) randaamathethu adayaalappeduthiya oru anoxic sambhavamaayirunnu mulde ivant. samudranirappil aagolathalathil idivundaayathode ithu jio kemikkal isodoppukalile oru paryadanavumaayi aduthuvarunnu. gotlandile frail roopeekaranathinte nikshepanavumaayi samanvayippichaanu athinte arambham. ennirunnaalum, conodont janthujaalangalil vamshanaashamundenn karuthunnath oru yadhaartha jaiva vamshanaashathekkaal avashishtangalude kramangalude nikshepa paristhithiyile maattathe prathinidheekarikkunnu.
uyarnna resolutionulla δ13c isotope vishakalanam jaiva, carbonate kaarban isotope vakrangalile (δ13c) vyathyaasangal thirichariyunnu, ithu avashishtashaasthraparamaaya daatta kanakkileduthaal vamshanaashavumaayi poruthappedunna kaarban dye ooksaidinte alavil sthiramaaya idivundaakumennu anumanikkaan anuvadikkunnu.
kurippukal.
irivikkan, mulde, lau evantukal ellaam isotopic vinodangal pinthudarnnu.

