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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA GEOLOGIA - Ediţia nr.1 din 2016 | |||||||
Articol: |
CALCAREOUS NANNOFOSSILS- AND AMMONITES-BASED BIOSTRATIGRAPHY OF THE BAGHAMSHAH FORMATION (CENTRAL IRAN BASIN, IRAN). Autori: . |
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Rezumat: Middle Jurassic calcareous nannofossils and ammonite assemblages from the Baghamshah Formation are described here, cropping out east of Semnan locality (Central Iran Basin, Iran). Low diversity and abundance characterize the nannofossil assemblages, which are dominated by genera belonging to the Family Watznaueriaceae. The calcareous nannofossil assemblages lack the usual markers for the Callovian interval, making difficult the age attribution. Ammonite assemblages display low diversity and poor preservation. From a biostratigraphical point of view, nannofossil assemblages would suggest that the material studied belongs to the NJT12 Zone from the Tethyan / sub-Mediterranean province and to the NJ12b subzone - lower NJ13 Zone from the Boreal province, correlating to the ammonite Tethyan / sub-Mediterranean Gracilis Zone and to the Boreal / sub-Boreal Koenigi - Calloviense Zones, yielding a Lower Callovian biostratigraphical distribution. Keywords: Middle Jurassic, Lower Callovian, Central Iran Basin, calcareous nannofossils, ammonites, biostratigraphy. Received: January 2016; accepted March 2016 Available online 29 March 2016 DOI: http://dx.doi.org/10.5038/1937-8602.60.1.1288 |
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