the first report of cryptospore assemblages of late ordovician in iran, ghelli formation, eastern alborz
نویسندگان
چکیده
for the first time, an assemblage of cryptospores, which includes 10 species belonging to nine genera, from the upper ordovicianstrata, is being reported, in iran. these cryptospore assemblages were recovered from the upper part of ghelli formation., from theeastern alborz mountain range. these peri-gondwanan cryptospores have been classified based on their morphology (monad, truedyad, pseudodyad, true attached, and loose tetrads). the results of the present study support previous findings that there are nosignificant differences between similar-aged cryptospore assemblages of the peri-gondwanan, baltic provinces and other parts of theworld. based on the presence of the chitinozoan index of the northern gondwana (spinachitina oulebsiri), the index acritarchs, and thepresent cryptospores, a late hirnantian (late ordovician) age is proposed to the top of the ghelli formation. the cryptospores seem tobe transported from an adjacent land area and the lack of land-derived elements in the up-section may indicate an increased distanceoffshore.
منابع مشابه
The first report of cryptospore assemblages of Late Ordovician in Iran, Ghelli Formation, Eastern Alborz
For the first time, an assemblage of cryptospores, which includes 10 species belonging to nine genera, from the Upper Ordovicianstrata, is being reported, in Iran. These cryptospore assemblages were recovered from the upper part of Ghelli Formation., from theeastern Alborz Mountain range. These peri-Gondwanan cryptospores have been classified based on their morphology (monad, truedyad, pseudody...
متن کاملMiospore assemblages from Late Ordovician (Katian-Hirnantian), Ghelli Formation, Alborz Mountain Range North-eastern Iran: Palaeophytogeographic and palaeoclimatic implications
Well-preserved miospore assemblages are recorded from the Late Ordovician (Katian-Hirnantian), Ghelli Formation in Pelmis-gorge at the north-eastern Alborz Mountain The palynomorphs were extracted from siliciclastic deposits which are well-dated by using of marine palynomorphs (acritarchs and chitinozoans). The encountered miospore assemblages consist of 14 genera (28 species: 26 cryptospores a...
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عنوان ژورنال:
geopersiaISSN 2228-7817
دوره 4
شماره 2 2014
کلمات کلیدی
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