Emsian (Lower Devonian) conodont stratigraphy and correlation of the Anti-Atlas (Southern Morocco)

An early Emsian (Zlichovian) ammonoid assemblage from Sangibaland Mountain (Shakhimardan River Basin) (South Tien Shan, Kyrgyzstan)

“…It is also comparable with faunas from the Dzhaus Beds of the Zeravshan Range (Bogoslovsky 1980;Becker et al 2010;Aboussalam et al 2015) and the Northern Caucasus (Nikolaeva 2007). (1) No Gyroceratites or Anetoceras have been found so far, but this might be due to regional bias or paucity of the material.…”

“…This is particularly pertinent for the PragianEmsian boundary beds, which are currently a focus of attention due to calls for a new definition of the Pragian-Emsian boundary (e.g. Walliser 1997;Chlupáč and Lukes 1999;Jansen et al 2007;Jansen 2012;Carls and Valenzuela-Ríos 2007;Carls et al 2008Carls et al , 2009De Baets et al 2009, 2013aBecker et al 2010;Baranov et al 2014;Aboussalam et al 2015). A new basal Emsian biostratigraphic index is sought in the Kitab area, at a higher level than the current Global Boundary Stratotype Section and Point (GSSP) defined by the FAD of the conodont Eocostapolygnathus kitabicus (Yolkin et al, 1998) and is likely to be at the level of the FAD of Eocostapolygnathus excavatus (Izokh et al, 2011) or of its Bsubspecies/morphotype 114^(sensu Carls and Valenzuela-Ríos 2002).…”

“…He redefined the predominant rhenotypic (BRhenish^) facies as a neritic-siliciclastic facies type. De and Aboussalam et al (2015) correlated limonitized fauna from the pelagic facies of the Tafilalt and also from the more pelagic lower part of the Mdaour-El-Kbir Formation and the top of the Merza-Akhsaï Formation at Mdaour-El-Kbir (Dra Valley, western Anti-Atlas), which were useful in correlating the Zlichovian beds of the AntiAtlas from the eastern Tafilalt (Klug 2001(Klug , 2002Klug et al 2008Klug et al , 2013 with those in the Dra Valley (Becker et al 2008). De Baets et al (2013a recorded the first occurrences of lower Emsian ammonoids in the dark-grey siltstones associated with bivalves and chonetid brachiopods, which supported the correlation with the strata of the Singhofen-Vallendar age of the middle Kaub Formation (containing the famous Hunsrück ammonoid fauna) (De Baets et al 2013b) and the Lower Emsian of Belgium (De Baets et al 2013a).…”

Devonian climate, sea level and evolutionary events: an introduction

“…black shales), plotted against the chronostratigraphic scale, old and new conodont zonations (e.g. Klapper 1989;Yolkin et al 1994;Klapper & Becker 1999;Aboussalam 2003;Slavík & Hladil 2004;Girard et al 2005;Murphy 2005;Aboussalam & Becker 2007;Slavík et al 2007Slavík et al , 2012Kaiser et al 2009;Hartenfels 2011;Corradini & Corriga 2012;Aboussalam et al 2015;Spalletta et al 2015;Valenzuela-Ríos et al 2015), and the zonal key for global ammonoid zones (Becker & House 2000). The substage levels shown here follow proposals to SDS but have only partly been ratified (Givetian, Frasnian) and not yet formally approved by the International Stratigraphic Commission.…”

The phacopine trilobite genera Morocops Basse, 2006 and Adrisiops gen. nov. from the Devonian of Morocco

“…Putative chronostratigraphic borders after Aboussalam et al (2015) and trilobites, in part, after Brett et al (2012). Authorship of trilobite species not mentioned elsewhere in the present note is as follows: Paralejurus rehamnanus Alberti, 1970, Erbenochile issoumourensis Chatterton & Gibb, 2010 and Hollardops boudibensis Morzadec, 2001.…”