Microbiostratigraphy of Kazhdumi Formation in the Northwestern Shiraz (Southwest Iran) on the Basis of Foraminifera and Calcareous Algae

The middle Cretaceous Kazhdumi Formation,with a thickness of 222 m,belongs to the Bangestan Group and occurs in the Zagros folded zone in southwest Iran.The lower boundary with the Dariyan Formation is disconformable,which is recognized by iron oxides and glauconite.The recognized microfossils are Valvulammina sp.,Scandonea sp.,Daxia cenomana,Choffatela sp., Pseudolituonella reicheli and calcareous algae-Lithocodium aggregation（which belongs to the Sarvak Formation）,representing the beginning of Cenomanian.Other microfossils are：Ammobaculites goodlandensis,Marsonella trochus,Hemicyclammina sigali,Praechrysalidina infracretacea,Orbitolina gr.concava,Orbitolina（conicorbitolina）conica,Orbitolina subconcava,Salpingoporella sp.,Trinocladus tripolitanus,Trinocladus sp.,Permocalculus irenae and Dissocladella deserta.These microfossils can be classified into five assemblage zones.

Calcareous Algae from Northeastern Brilon Reef Complex of Middle and Upper Devonian in Eastern Sauerland， Germany

Evonian massive limestones in the Northeastern Brilon reef complex comprise many marine calcareous algae. 10 genera all 12 species could be identified .They are Keega australe,Solenopora geikiei,Solenopora sp. (red algae ), Litanaia cf. perisseia,Ortonella sp.,Vermiporella sp. (green algae ); Epiphyton sp., Girvanella ducii, Girvanella problematica,?Sphaerocodium sp.,Renalcis sp. (blue green algae )and Kamaena sp.. The distribution and relative abundance of these algae are conjoined to specific factes types and therefore they are very in the interpretation of paleoenvironments. In addition, calcareous algae can be used for the geologic dating.

Biostratigraphy of Albian Sediments(Kazhdumi Formation)in Zagros Area(Southwest of Iran)

To investigate biostratigraphy of Albian sediments(Kazhdumi Formation)in the Zagros Basin,280 samples in four sections were prepared which are nominated as Murshan-e-Bala,Fahliyane-Pain,Kupon and Tale-e-Afghani.Stratigraphic distribution of identified foraminifers confirms well developed orbitolinids which are associated with other Albian benthic foraminifers in all studied sections.The orbitolinids are recognized in surrounding strata[Dariyan(at the base which is marked by an oxidized zone)and Sarvak Formations(on the top,as gradtional contact)]as well as the Kazhdumi Formation.Obtained biostratigraphic data show that Early Albian is marked by the presence of Hemicyclammina sigali,which co-occurs with Mesorbitolina texana and Mesorbitolina subconcava,whereas Conicorbitolina conica and Meorbitolina parva support Late Albian age of the studied sections.Calcareous algae are associated with both benthic faunal assemblages.Albian planktons occur in the studied sections which are identified as Favusella washitensis and Calcisphaerula inomminata subzones.The stratigraphic position of planktons actually indicates vertical displacement in the sedimentary basin during Albian time.Other associated Albian pelagic foraminifera are identified which are obviously recognized in three sections of the Kazhdumi Formation.The presence of pelagic species in the study section of the Kazhdumi Formation indicates basement faulting during the Albian period.