Parahoplitid ammonites and narrowing down the Aptian/Albian boundary interval in northern Iran

Ammonite stratigraphy and the belemnite genus Hibolithes in the higher Serdj Formation (Aptian-Albian boundary interval) in north central Tunisia

“…nutfieldiensis by Lehmann et al (2009) to "M." chihaouiae. After one of us (JL) was studying the type specimens of P. nutfieldiensis at the Natural History Museum (Lehmann et al 2019: Supplementary Data Appendix B) we agree that the Tunisian specimen are not conspecific with P. nutfieldiensis. Based on the fairly open coiling and according to the ornament, it appears likely that they represent "Mellegueiceras".…”

“…2). The results of the most recent paper on this topic also did not find evidence for a co-occurrence of Acanthohoplites, Hypacanthoplites and Parahoplites (Lehmann et al 2019). At least it is clear that acanthohoplitids overlap with Hypacanthoplites and Parahoplites based on the record in Iran (Lehmann et al 2019).…”

First discovery of nautilids from the Albian–Cenomanian succession of the Koppeh Dagh Basin, NE Iran

“…Previous studies documented several ammonite-rich beds and proposed the basic age framework for the Taherabad section of the Aitamir Formation and for adjacent areas (Lehmann et al, 2019;Mosavinia, 2008;Mosavinia et al, 2014). We used the ammonite occurrences and zones to provide the age information for the stratigraphic levels in which we collected our specimens.…”

“…Swiss Journal of Palaeontology Editorial handling: Christian Klug. *Correspondence: sharifi.javad@mail.um.ac.ir 1 Department of Geology, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, Iran Full list of author information is available at the end of the article focused on the ammonites (Seyed-Emami & Aryai, 1981;Seyed-Emami et al, 1984;Immel et al 1997;Mosavinia et al, 2007Mosavinia et al, , 2014Mosavinia, 2008;Lehmann et al, 2019), and a few studies on planktonic foraminifera (Abdoshahi et al, 2010;Kalanat et al, 2016). We here describe and illustrate the first record of nautilids from the Albian-Cenomanian Aitamir Formation in the Koppeh Dagh Basin.…”

“…2 Stratigraphic distribution of the nautilids in the Taherabad section. Ammonite zonation and substages boundaries are adopted from Mosavinia (2008); Mosavinia and; Mosavinia et al (2014) and Lehmann et al (2019) Formation, which is characterized by chalky limestones and marls. The Taherabad section is one of the wellstudied outcrops of the Aitamir Formation in the Koppeh Dagh Basin, and many previous authors have presented detailed lithostratigraphic description of the section (e.g., Kalanat et al, 2016;Mosavinia & Wilmsen, 2017;Mosavinia et al, 2014).…”