Stratigraphy and Palaeontology
Fateme Mahdikhani; Mahmoud Reza Majidifard; T. Mohtat; L. Bakhshande; M. Zamanipedram
Abstract
In order to study the biostratigraphy and lithostratigraphy of the K/Pg boundary two sections was considered. They are the Kuh-e Zaluband and Kuh-e Hunu sections in east of Khur (Esfehan Province). At the Kuh-e Zaluband section has a maximum thickness of 100 m, consisting of marl, limestone, sandy limestone, ...
Read More
In order to study the biostratigraphy and lithostratigraphy of the K/Pg boundary two sections was considered. They are the Kuh-e Zaluband and Kuh-e Hunu sections in east of Khur (Esfehan Province). At the Kuh-e Zaluband section has a maximum thickness of 100 m, consisting of marl, limestone, sandy limestone, sandstone and conglomerate and in the Kuh-e Hunu consisting of marl, limestone and sandy limestone. The lower part of the sections belonging to Farrokhi formation and upper part to Chupanan formation. Based of biostratigraphy at the study sections, summing up 88 thin sections were collected, among which the foraminifera with 17 specimens clearly predominate and belonging to 31 genera. Based on the foraminifera the age of the upper part of Farrokhi formation in the investigated area ranges Late Maastrichtian and Late Paleocene for lower part of Chupanan formation. Based on the paleontology, lithology and facies, there is disconformity in Cretaceous-Paleogene boundary in Kuh-e Zaluband and paraconformity in Kuh-e Hunu.
H Seif; M Majidifard; T Mohtat
Abstract
The Farrokhi formation in 15 km southwest of Khur with a thickness of up to 117m consists of marl and limestone with Maastrichtian age. In this section, the Farrokhi formation disconformably overlies the Haftoman formation below and the Chupanan formation above. In the present study, 87 genera and 103 ...
Read More
The Farrokhi formation in 15 km southwest of Khur with a thickness of up to 117m consists of marl and limestone with Maastrichtian age. In this section, the Farrokhi formation disconformably overlies the Haftoman formation below and the Chupanan formation above. In the present study, 87 genera and 103 species have been recognized. Based on foraminifera, the Farrokhi formation ranges from the Maastrichtian and 3 biozones in the rock unit 1 of the formation have been recognized: (1) Contusotruncana contuse Partial range zone (CF6), indexing Early Maastrichtian.(2) Pseudotextularia intermedia Partial range zone (CF5), index for late Early Maastrichtian index and (3) Racemiguembelin fructicosa Taxon Range Zone (CF4), an index for early Late maastrichtian. The Farrokhi formation can be subdivided into four rock units which are composed of marl and marly limestone. In addition, the Farrokhi formation fauna contains ostracods and high abundance of invertebrate as diverse species of brachiopods, echinoderms and bivalves with rare fragments of ammonites. The K/Pg boundary is in this section paraconform and can be compared with boundary of the Farrokhi and Chupanan formations. The evidence of paraconformity is a gap of Early Paleocene and changes in lithfacies. The Farrokhi formation is carbonate and it is parts of a carbonate system consisting of a platform and the adjacent slope.
H Kamali Sarvestani; A Sadeghi; S.M Mousavian
Abstract
Coexistence between hydroid Protulophila gestroi Rovereto, 1901 and family Serpulidea have been reported from many localies in Europe (England, France, Germany,…) and Middle East (Syria) from Middle Jurassic (Bajocian) to Pliocene. In this study coexistence for the first time in Iran and second ...
Read More
Coexistence between hydroid Protulophila gestroi Rovereto, 1901 and family Serpulidea have been reported from many localies in Europe (England, France, Germany,…) and Middle East (Syria) from Middle Jurassic (Bajocian) to Pliocene. In this study coexistence for the first time in Iran and second time in Middle East are reported. The symbiont in Debarsu formation at Haftuman region in south west of Khur city has been identified. Debarsu formation with age of Early-Middle Cenomanian contains a rich collection of coexistence hydroid Protulophila gestroi with serpulid Rotulispira at 225 m from their base.
