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  Paleontology
Calcareous Nannofossils of Iran
Author : Fatemeh Hadavi
Publisher date : October 2002
Chapter title : Second Chapter - Biostratigraphy
Data title : Abderaz Formation


Formation of Long Water Upper Cretaceous formations are Kopet Dagh Basin. The name of the village water formation in long Kopet Dagh mountains southeast at 75 km East Mashhad is taken. Although the name of the formation derives from a village water has been long, but its type in those sections are mercenaries.


Long contact with water formation Atamir lower slope and erosion, but also a high level it has joined with Abtalkh (Kalantari, 1969).

 
Major lithology light gray shale formation tends to gray to blue and white tends to have three or four bands of limestone is Chalky. Upper Cretaceous sediments in most regions of white flowers (Chalky limestone) have been established. Generally, flowers white limestone consists of fine grain sediments and pelagic limestone containing microplanktons and is Nannoplanktons. Coccolith is with 90 percent of calcareous shells and nannoplanktons foraminifera. And the calcareous shells are such as oysters and are with two plates of Aquino brachiopod plate faces, needles and sponges, and Degenerative clay minerals, pyrite and quartz glauconite are formed. Chuck Stone, porous, fine grain is sometimes fragile. Cayeux in 1936 is a reminder that different foraminifera fining Chuck rate is inversely proportional. In other words, being a fine representative Chuck Foraminifera low number and many are Coccolith. Bands are in the limestone formation Chalks innoceramus frequency values, and Ammonite echinoid there. In this formation, including globotruncana foraminifera plankton is abundant.
Stratigraphy and paleontological studies, since several studies on various sections of the formation water has long been done. Studies conducted Foraminifera Paleontology. Kalantari and large sibling age formation in cutting pattern, Toronian - Coniacian suggest.
Pattern of incision along southeast towards Sand is thicker. Age of formation sections located in the stretch of water in South East by a cutting pattern. Kalantari, Senonian: Niacin - Santonian - Campanian) and determined the cut in the North West Taher Abad cutting pattern, the north slope anticline nipple, Toronian - Stonian Report was. He also cut Zanganlu studied based on the age of foraminifera for the proposed Santonian: Ned. Other sections in the region Kopet Dagh mentioned by researchers (and large sibling Kalantari) were presented and the age range for this time of the sections listed.


Here for the first time that in abundance Nonnofossils calcareous marl and Chalky sediments found in the section type (Hadavi - Industrial 1377, Figure 21 A) and cut Taher Abad (Hadavi - Karami in 1379 Figure 42) are introduced and Dating. These deposits are eligible Nannofossil lot of biology. Based on values
​​defined Biogenesis stratigraphy, geological time Coniacian Late - Late Companian boundary Santonian former long for water formation is suggested.

Atlas of Abderaz Formation Nonnofossils

Images is available in the attachment.


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