faminian

devonian kaalaghattatthinte avasaanathile rund janthujaalangalude ghattangalil randaamathethaanu famenian. athinte dairkhyathekkurichulla ettavum puthiya kanakk kanakkaakkunnath ithu ekadesham 371.1 dasalaksham varshangalkk munbu muthal 359.3 dasalaksham varshangalkk munbu vare nilaninnirunnu ennaanu. internaashanal kammeeshan oonn strattigraphy ippozhum upayogikkunna 2012 leeii oru munkaala kanakk, ithu dasalaksham varshangalkk munbu muthal dasalaksham varshangalkk munbu vare nilaninnirunnuvennu kanakkakkunnu. ithinu munbu frasnian ghattavum thudarnnu tournaisian ghattavumundaayirunnu.
pradhana sambhavangal.
kadalil, climenids ennariyappedunna amonoid sephalopodukalude oru puthiya pradhana koottam prathyakshappedukayum, athishakthamaya vaividhyavalkkaranathin vidheyamaakukayum lokamembaadum vyaapikkukayum cheythu, appol thanne pettennu vamshanasham sambhavichu.
famenian vamshanaashathinte thudakkam oru pradhana vamshanasha sambhavathinte avasana gattangalaaya kelvasser ivant adayaalappeduthunnu, ithu devonian maas vamshanaashathinte ettavum valia gadakamaanu. famenian kaalaghattatthinte avasaanam cheruthenkilum ippozhum valare kadinamaaya vamshanasha sambhavamaaya hangenberg sambhavam anubavikkunnu. orupakshe hangenberg sambhavavumayi bandhappettirikkunna himaniyude oru hraswa episode, carboniferous, permian kaalaghattangalile paleosoic himayugathinu munbulla hraswa himaanikalude parambarayile aadyathethaanu.
upavibhagangal.
internaashanal kammeeshan oonn strattigraphy faminiane praadhamikamaayi conodont soneshane adisthaanamaakki naalu anoupachaarika substageukalaayi vibhajikkunnu. jarmman straattigraafiyile naalu charitraparamaaya upavibhagangalumaayi famenian poruthappedunnu nehdenian, hemberjian, dusburgian, voclumian (ettavum praayam kuranjathu muthal ettavum praayam kuranjathu vare). ennirunnaalum, iva amonoid soneshane maathram adisthaanamaakkiyullavayaanu, anoupachaarika aii. sii. ezz upavibhagangalumaayi krithyamaayi poruthappedunnilla. ettavum mukalilulla famenian substage (voclumian kanakkaakkunnath) ardense mekhalayile strunian ennum ariyappedunnu.
famenian vamshajarude vadakke american upavibhagangalil choudaukwaan, canadaway, kanakttu, kanakttaan, konwango, konwankan enniva ulppedunnu.
perum nirvachanavum.
1855-ll beljian geologist andrey hubert dumont nirddeshicha famenian ghattam 1981-ll devonian strattigraphy upa kammeeshan upper devoniante mukalile ghattathilekku sweekarichu. thekkan beljiyathile oru prakrithidatha pradeshamaaya famenne namakaranam cheythathaanu ithu. 1993ll amgeekaricha lover jii. ezz. ezz. pii thekkan fraansile sesenoninu sameepamulla komiyak roopeekaranathilaanu sthithi cheiyunnathu.
2017 muthal, faameniyante aditharaye nirvachichirikkunnathu konodondukalude savisheshamaaya vittuvarav, prathyekichu "palmatolepis bogartansis"-nte avasana roopam, "palmatolepis subperlobatta"-yude aadya roopam, "palmatolepis altima"-yude samriddhiyile vardhanavu ennivayaanu. palmatolepis thrikonaakrithiyilulla" conodont soninte thudakkamaanu ithu munbu nirvachichathenkilum pinneedulla padanangal "p" ennu kaanichu. jii. ezz. ezz. piyile pradhana conodont vittuvaravinekkaal alpam vaikiyaan thrikonaakrithiyilullathu aadyamaayi prathyakshappettath.
ruffer radioisotopic recordukale adisthaanamaakkiyulla 2012 aii. sii. ezz timescale kanakkaakkunnath famenian ekadesham <aii. dii. 2> ± 1.6 maa yill aarambhich <aii. dii. 1> ± 0.4 maa yill avasaanichu ennaanu. 2020ll ithu 371.1 ±1.1 Ma enna thudakkathilum 359.3 ±3.3 Ma enna avasaanathilum parishkarichu.

