M.R Kebriaee- Zadeh
Abstract
Hojedk section is located 62 km north of Kerman. In this section Padeha Formation with Middle Devonian age overlies Bahram Formation conformably, and it is covered with Jamal Formation (Late Permian) with a disconformity boundary. The study of Bahram Formation brachiopoda resulting into 32 species and ...
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Hojedk section is located 62 km north of Kerman. In this section Padeha Formation with Middle Devonian age overlies Bahram Formation conformably, and it is covered with Jamal Formation (Late Permian) with a disconformity boundary. The study of Bahram Formation brachiopoda resulting into 32 species and subspecies consists of: Schizophoria striatula, Schizophoria cf. iowaensis, Devonoproductus sp., Productella cf. subaculeata, Strophodonta sp., Cyphoterorhynchus koraghensis, Cyphoterorhynchus koraghensis interpositus, Ripidiorhynchus elburzensis, Ripidiorhynchus kermanensis, Ripidiorhynchus minutissimus, Paropamisrhynchus kotalensis, Lateralatirostrum esfehensis, Spinatrypina chitralensis, Spinatrypina bodini, Spinatrypina cf. robusta , Desquamatia (Desquamatia) sp., Desquamatia (Serateypa) sp., Athyris chitralensis, Athyris sp., Anathyris e. g. helmersenii, Gypidula sp., Cyrtospirifer verneuili echinosus, Cyrtospirifer kermanensis, Cyrtospirifer schelonicus, Cyrtospirifer sp., Uchtospirifer multiplicatus, Uchtospirifer multiplicatus minor, Tenticospirifer cyrtinaformi, Tenticospirifer cf. tenticulum, Indospirifer sp., Rigauxia hutkensis, Cranaena cf. rigauxi, Based on the biostratigraphical value of the recognized brachiopoda, the age of Bahram Formation in the Hojedk section is determined Early- Late Frasnian.
M. R. Kebria-ee
Abstract
Geirud Formation has a wide distribution in the Damghan region. The Formation Lithology is mostly composed of limestone, marly limestone, shale and quartizic sandstone and its thickness ranges from 10 - 200 meters. Brachiopoda of Geirud Formation in the southwest, north and northeast of Damghan region ...
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Geirud Formation has a wide distribution in the Damghan region. The Formation Lithology is mostly composed of limestone, marly limestone, shale and quartizic sandstone and its thickness ranges from 10 - 200 meters. Brachiopoda of Geirud Formation in the southwest, north and northeast of Damghan region (Darvar, Simeh- Kuh and Deh- Molla sections) were studied and resulted in recognizing some species that are as follows: Schellwienella sp., Mesoplica sp., Sentosia sp., Schizophoria impressa, Leptagonia sp., Aulacella interlineata, Zaigunrostrum iranicum, Leptocaryorhynchus jamensis, Araratella dichotomians assimulata, Araratella sp., Centrorhynchus charakensis, Megalopterorhynchus chanakchiensis, Paurogastroderhynchus nalivkini, Paurogastroderhynchus bikniensis, Cleiothyridina coloradensis, Cleiothyridina sp., Athyris tau, Composita cf. globosa,Lamellosathyris sp., Cyrtospirifer sergunkovae, Cyrtospirifer sp.,Cyrtiopsis graciosa chakhaensis, Cyrtiopsis lapparenti, Prospira struniana, Prospira lapparenti, Rigauxia cyrtinaeformis, Rigauxia crassiplicatus, Dichospirifer thylakistoides, Eobrachythyris sp.,Toryniferella echinulata, Cryptonella sp. Based on the above mentioned Brachiopoda an age of Early Famennian- Late Famennian can be considered for carbonate part of Geirud Formation in the these sections. Also, Geirud Formation in the sections is equivalent with middle and upper parts (with the exception of Rossirhynchusbiozone) of Geirud Formation in the type section (Central Alborz).