
ruddanian

bhoogarbha kaalakramamlo, ruddanian anedi silurian kaalam mariyu land recovery yugam yokka modati yugam. silurian anedi phenerozoic eoin yokka paleozoic yugamlo undhi. ruddanian yugam 443.8 ± 1.5 Ma praarambhamai 440.8 ± 1.2 Ma (million samvatsaraala kritam) thoo mugisindi. idhi haemantian yugam (ordovician kaalam yokka chivari yugam) taruvaata aeronian yuganiki mundu vastundi.
gssp.
silurian kosam zii. ess. ess. pii. skaatlaandlooni dobbs linn vadda oka vibhaagamlo undhi, linn saakha pravaahaaniki uttaraana srushtinchabadina krutrima tavvakam. rendu lithological unitlu (nirmaanaalu) sarihadduku sameepamlo sambhavistaayi. diguva bhaagamlo hartfell shale (mandapati) untundi, indulo pradhanamgaa laetha buudida rangu matti raayi, adheena nalla shales mariyu aneka interbeded meta-bentonites untaayi. dheeni paina mandapati birkhil shale undhi, idhi pradhanamgaa nallati graptolytic shelnu kaligi untundi, indulo diguva buudida rangu matti raallu mariyu meta-bentonitelu untaayi.

