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1
Content available Silurian stratigraphy of Central Iran - an update
Hairapetian V., Ghobadi Pour M., Popov L. E., Männik P., Miller C. G.
Acta Geologica Polonica
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2017
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Vol. 67, no. 2
201--233
EN
The Silurian biostratigraphy, lithostratigraphy, and facies of Central Iran including the Kashmar (Boghu Mountains), Tabas (Derenjal Mountains, Ozbak-Kuh), Anarak (Pol-e Khavand) and Kerman regions is reviewed and updated. The current state of knowledge of the Silurian in the Zagros Basin, Alborz, Kopet-Dagh and Talysh regions, as well as in a few areas scattered across the Sabzevar Zone, and the Sanandaj-Sirjan terranes is also reviewed. Silurian volcanism in various parts of Iran is briefly discussed. The end of the Ordovician coincided with a widespread regression across Iran synchronous with the Hirnantian glaciation, and only in the Zagros Basin is there a continuous Ordovician–Silurian transition represented by graptolitic black shales of the Sarchahan Formation. In the Central-East Iranian Platform marine sedimentation re-commenced in the early to mid Aeronian. By the Sheinwoodian, carbonate platform depositional environments were established along its north-eastern margin. In other parts of Iran (e.g., Kopet-Dagh and the Sabzevar Zone), siliciclastic sedimentation continued probably into the late Silurian. The Silurian conodont and brachiopod biostratigraphy of Central Iran is significantly updated facilitating a precise correlation with the Standard Global Chronostratigraphic Scale, as well as with key Silurian sections in other parts of Iran. The Silurian lithostratigraphy is considerably revised and two new lithostratigraphical units, namely the Boghu and Dahaneh-Kalut formations, are introduced.
2
Content available Review of the Ordovician stratigraphy and fauna of the Anarak Region in Central Iran
Popov L. E., Hairapetian V., Evans D. H., Ghobadi Pour M., Holmer L. E., Baars C.
Acta Geologica Polonica
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2015
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Vol. 65, no. 4
403--435
EN
The Ordovician sedimentary succession of the Pol-e Khavand area, situated on the northern margin of the Yazd block, has important differences from those in other parts of Central Iran. It has been established that the presumably terminal Cambrian to Lower Ordovician volcano-sedimentary Polekhavand Formation, exposed in the Pol-e Khavand area, has non-conformable contact with greenschists of the Doshakh Metamorphic Complex. The succeeding, mainly siliciclastic Chahgonbad Formation contains low to moderately diverse faunal assemblages, including brachiopods, cephalopods, trilobites and tentaculitids. The Darriwilian age of the lower part of the formation is well established by the co-occurrence of brachiopod genera Camerella, Phragmorthis, Tritoechia and Yangtzeella. The associated rich cephalopod fauna is different from the Darriwilian cephalopod associations of the Alborz terrane and may show some affinity with warm water faunas of North China and South Korea. It is likely that the Mid Ordovician fauna recovered from the lower part of the Chahgonbad Formation settled in the area sometime during a warming episode in the late Darriwilian. By contrast the low diversity mid Katian brachiopod association includes only three taxa, which occur together with the trilobite Vietnamia cf. teichmulleri and abundant, but poorly preserved tentaculitids questionably assigned to the genus Costatulites. This faunal association bears clear signatures linking it to the contemporaneous cold water faunas of the Arabian, Mediterranean and North African segments of Gondwana. Four brachiopod species recovered from the Chahgonbad Formation, including Hibernodonta lakhensis, Hindella prima, Lomatorthis? multilamellosa and Yangtzeella chupananica are new to science.
3
Content available remote Chondrichthyan microfossils from the Famennian and Tournaisian of Armenia
Ginter M., Hairapetian V., Grigoryan A.
Acta Geologica Polonica
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2011
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Vol. 61, no. 2
153-173
EN
The assemblages of chondrichthyan microremains from the Famennian of Armenia show great resemblances to those from central Iran. Particularly, the very rich sample (almost 200 teeth) from the lower Famennian of Ertych contains a fauna similar to that from the Iranian section of Hutk, and the sample from the upper Famennian of Khor Virap has its counterpart in the sample from Dalmeh, Iran. Only one chondrichthyan taxon definitely unknown from Iran, Ertychius intermedius gen. et sp. nov., was recorded. The other newly described species, Lissodus lusavorichi sp. nov., was noted earlier from Dalmeh, but at that time was left unnamed. It appears that the same type of relatively shallow marine environment predominated in the central and north-western parts of the Iranian Platform during the Famennian and that in a given time-interval the same type of ichthyofauna was distributed throughout the area. The single lower Tournaisian sample from the Sevakavan section yielded a peculiar form of thrinacodont teeth, possibly intermediate between Thrinacodus tranquillus and Th. ferox.
4
Content available remote Pelagic chondrichthyan microremains from the Upper Devonian of the Kale Sardar section, eastern Iran
Hairapetian V., Ginter M.
Acta Geologica Polonica
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2010
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Vol. 60, no. 3
357-371
EN
An assemblage of fifteen taxa of chondrichthyan microremains from late Frasnian through late Famennian pelagic deposits of the Kale Sardar section, eastern Iran, is described. Several taxa (Phoebodus bifurcatus, Phoebodus sophiae and Protacrodus vetustus) are reported for the first time from Iran. The presence of Deihim mansureae and Ph. sophiae in the Late rhenana to linguiformis Zones and Phoebodus rayi in the early triangularis Zone of the Kale Sardar section, provides new biostratigraphic information. The late Frasnian part of the assemblage corresponds to the faunas from the intrashelf basins of central europe, and the middle.late Famennian part is comparable to that from the tafilalt Platform of Morocco.
5
Content available remote Famennian chondrichthyan remains from the Chahriseh section, central Iran
Hairapetian V., Ginter M.
Acta Geologica Polonica
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2009
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Vol. 59, no. 2
173-200
EN
A diverse shallow water assemblage of chondrichthyan microremains is described from the Famennian of the Chahriseh section, central Iran. Twenty-two taxa are identified; of these two new taxa viz. Roongodus phijani gen. et sp. nov. (Hybodontoidea) and Arduodens flammeus gen. et sp. nov. (Ctenacanthiformes) have been erected. Two morphoecological subtypes of Ph. gothicus dentition, characteristic of deeper and shallower shelves, are proposed.
6
Content available remote Early Frasnian sharks from central Iran
Hairapetian V., Ginter M., Yazdi M.
Acta Geologica Polonica
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2008
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Vol. 58, no. 2
173-179
EN
Two limestone bone-beds in the early Frasnian of the Chahriseh section, central Iran, yielded numerous chondrichthyan teeth and scales. The fauna includes, most probably, only two taxa: a hitherto unknown aztecodontid omalodontiform, Manberodus fortis gen. et sp. nov., and a multicuspid phoebodontiform, provisionally referred to as Phoebodus cf. latus GINTER & IVANOV, 1995.Anew omalodontiform family, Aztecodontidae, including Aztecodus LONG& YOUNG, 1995 and Manberodus gen. nov., is proposed.
7
Content available remote Visean and Bashkirian ammonoids from Central Iran
Hairapetian V., Korn D., Bahrami A.
Acta Geologica Polonica
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2006
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Vol. 56, no. 3
229-240
EN
Two successions of Carboniferous sedimentary rocks in Central Iran yielded ammonoid assemblages from one horizon each. In the Ramsheh section, a siltstone with Neoglyphioceras yazdii n. sp. and Dombarites can be assigned to the latest Visean. The assemblage from the Shesh Angosht Mountain is more diverse with species of the genera Proshumardites, Eumorphoceras, Homoceras, Glaphyrites, Syngastrioceras, and Dombarocanites. This is the first time that the co-occurrence of the genera Eumorphoceras and Homoceras has been recorded. This fauna contains elements of the South Urals and Central Asian occurrences of Bashkirian ammonoids and suggests close palaeobiogeographic relationships.
8
Content available remote Famennian chondrichthyans from the shelves of North Gondwana
Ginter M., Hairapetian V., Klug C.
Acta Geologica Polonica
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2002
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Vol. 52, nr 2
169-215
EN
Ichthyoliths, mainly shark teeth, from the Famennian of Iran and Northwest Africa are described. Evolution of shallow-water chondrichthyan assemblages on the shelves of Central Iran and the Tafilalt Platform, Morocco, related to time and environmental changes, is discussed. Four new taxa, viz. Deihim mansureae gen. et sp. nov. Protacrodus serra sp.nov., Phoebodus depressus sp. nov., and Ph. gothicus transitans subsp. nov. are erected and provisional reconstructions of heterodonty in dentitions of several Famennian sharks are proposed.
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