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Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities
by
Nasehi, Mohammad Amin
, Nasehi, Ehsanollah
in
BIOESTRATIGRAFÍA / BIOSTRATIGRAPHY
2023
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Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities
by
Nasehi, Mohammad Amin
, Nasehi, Ehsanollah
in
BIOESTRATIGRAFÍA / BIOSTRATIGRAPHY
2023
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Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities
Journal Article
Biostratigraphy of Yazdanshahr No.2 section in Kerman area, Central Iran, based on conodont communities
2023
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Overview
Yazdanshahr No.2 section, which consists mostly of Bahram and Sibzar formations is located in the Zarand city, northern Kerman province (Central Iran). Five biozones have been identified based on the conodont community. The first biozone, which includes Padehat (15 meter) and Sibzar formations (75 meter), was distinguished based on genera Bipennatus and Icriodus and the probable corresponding age was considered to span Emsian to Eifelian. The second biozone is recognized by the first appearance of index taxon Polygnathus varcus (varcus Zone: early to middle Givetian). The third biozone starts with the firth appearance of the index genus Icriodus expansus (expansus zone: middle Givetian). The base of the Fourth biozone is recognized by the first appearance of the genus I. subterminus (subterminus Zone: middle to late Givetian) and the last biozone was distinguished with the first appearance of genera Ancyrodella and Polygnathus incompletes in the Givetain-Frasnian boundary (falsiovalis to crepida Zone?: Frasnian to Famenian?). Bahram Formation (94 meter) consists of Fossiliferous limestone (varcus to subterminus Zone) at the lower part, and alternation of dolomite and sandstone (falsiovalis to crepida Zone?) at the upper part. Sibzar Formation consists of Middle Devonian dolomite and limy dolomite containing intercalation of sandstone and limestone layers.
La sección Yazdanshahr No.2, que consiste en su mayor parte de las formaciones Bahram y Sibzar, se localiza en la ciudad de Zarand, provincial del norte de Kerman (Irán central). Cinco biozonas han sido identificadas con base en comunidades de conodontos. La primera biozona, que incluye a las formaciones Padehat (15 metros) y Sibzar (75 metros), se distingue con base en la presencia de los géneros Bipennatus and Icriodus, y la edad probable fue considerada en el rango del Emsiano al Eifeliano. La segunda biozona es reconocida por la primera aparición del la especie índice Polygnathus varcus (Zona varcus: Givetiano temprano a medio). La tercer biozona comienza con la primera aparición de la especie índice Icriodus expansus (Zona expansus: Givetiano medio). La base de la cuarta biozona es reconocida por la primera aparición de la especie Icriodus subterminus (Zona subterminus: Givetiano medio a tardío), y la última biozona fue reconocida con la primera aparición de los taxa Ancyrodella y Polygnathus incompletes, en el límite Givetaino-Frasniano (Zona? falsiovalis a crepida: Frasniano a Fameniano?). La Formación Bahram (94 metros) consiste en una caliza fosilífera (Zona varcus a subterminus) en su porción inferior, y de una alternancia de dolomita y arenisca (Zona? falsiovalis a crepida), en su porción superior. La Formación Sibzar consiste de una dolomita de edad Devónico Medio y una dolomita limosa, que contiene una intercalación de capas de arenisca y caliza.
Publisher
Sociedad Geológica Mexicana & Instituto de Geología UNAM
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