The ammonite genera Gravesia Salfeld and Pseudogravesia Hantzpergue in the Tithonian of S Germany and their correlation value with Western Europe Armin Scherzinger a, *, Gu ¨ nter Schweigert b a La ¨mmerhalde 3, Eberdingen D-71735, Germany b Staatliches Museum fu ¨r Naturkunde Stuttgart, Rosenstein 1, Stuttgart D-70194, Germany 1. Introduction Since the first description of its type species (Ammonites gigas Zieten, 1830) several studies have dealt with the systematics and stratigraphic distribution of the ammonite genus Gravesia in the Hangende–Bankkalke Formation (Lower Tithonian, Hybonotum Zone) of SW Germany (e.g. Berckhemer and Ho ¨ lder, 1959; Hahn, 1963; Ohmert and Zeiss, 1980; Schweigert, 1993a; Schweigert and Scherzinger, 1995; Schweigert, 1996a; Zeiss et al., 1996; Dimke and Zeiss, 1997; Scherzinger et al., 2006). Hantzpergue (1987, 1989) demonstrated for the first time the succession of different chronospecies of this genus in some parts of France during the Kimmeridgian/Tithonian transition. The Gigas Zone (including the Gigas and Gravesiana subzones) permits the potential for a correlation with the Hybonotum/Lithographicum Zone of the Submediterranean and Mediterranean provinces (Hantzpergue, 1989; Geyssant, 1996). The Hybonotum Zone was divided by Zeiss (1968, 2003) into three subzones in Franconia (Riedense, Rueppellianus and Moernsheimensis subzones). Other authors (e.g. Schweigert and Zeiss, 1998, 1999; Schweigert, 1996b, 1999, 2000, 2007, 2015; Zeiss and Schwei- gert, 1999; Scherzinger et al., 2015, paper herein) followed this proposal and completed the zonal scheme with numerous ammonite faunal horizons. Because of the occurrence of Gravesia in S Germany, some authors used the Gigas and Gravesiana subzones for the division of the Hybonotum Zone in Swabia as well (e.g. Schweigert, 1996a; Schweigert and Scherzinger, 1995; Dimke and Zeiss, 1997). Schweigert and Scherzinger (1995) used the Submediterranean subdivision of the Hybonotum Zone (sensu Zeiss, 1968) for Franconia and the Gigas and Gravesiana subzones (sensu Hantz- pergue, 1989) for Swabia due to the virtual lack of significant Proceedings of the Geologists’ Association xxx (2016) xxx–xxx A R T I C L E I N F O Article history: Received 29 August 2015 Received in revised form 29 December 2015 Accepted 30 December 2015 Available online xxx Keywords: Gravesia Pseudogravesia Hangende–Bankkalke Formation Tithonian Hybonotum Zone SW Germany A B S T R A C T The Subboreal ammonite genus Pseudogravesia and new finds of the genus Gravesia are reported from the Tithonian of Swabia. In S Germany Gravesia is widespread in the middle part of the Hybonotum Zone (riedlingensis to laisackerensis horizons), but does not occur in the end of the zone. The older level with Gravesia gigas (riedlingensis Horizon) can be identified in Franconia and SE France as well. This horizon corresponds to the lower part of the gigas Horizon (Gigas Zone) in W France. There, a higher level yielding both G. gigas and G. gigas intermedia corresponds with the beds between the riedlingensis and laisackerensis horizons in Swabia. In the still younger Gravesiana Subzone of Quercy (W France) there exist two levels with Gravesia. The lower one contains Gravesia gigas intermedia and Gravesia gravesiana. The upper one yields exclusively G. gravesiana and very rare Pseudogravesia gravesiformis. The lower level corresponds to the laisackerensis Horizon of S Germany (numerous G. gigas intermedia, few G. gravesiana). All records of Pseudogravesia from Swabia come from the laisackerensis Horizon and belong to a single taxon. In the lower parts of the Hangende–Bankkalke Formation of Swabia, both Gravesia and Pseudogravesia are apparently missing. Younger faunal horizons of the Hybonotum Zone occur in Franconia but not in Swabia due to post-Jurassic erosion. In the ammonite faunas of the latest Hybonotum Zone of Franconia, above the laisackerensis Horizon, Submediterranean taxa predominate. This explains the lack of Gravesia and Pseudogravesia both in the rueppellianum and moernsheimensis horizons. ß 2016 The Geologists’ Association. Published by Elsevier Ltd. All rights reserved. * Corresponding author. Tel.: +49 70421020835. E-mail address: Armin.Scherzinger@t-online.de (A. Scherzinger). G Model PGEOLA-484; No. of Pages 9 Please cite this article in press as: Scherzinger, A., Schweigert, G., The ammonite genera Gravesia Salfeld and Pseudogravesia Hantzpergue in the Tithonian of S Germany and their correlation value with Western Europe. Proc. Geol. Assoc. (2016), http://dx.doi.org/10.1016/ j.pgeola.2015.12.010 Contents lists available at ScienceDirect Proceedings of the Geologists’ Association jo ur n al ho m ep ag e: www .els evier .c om /lo cat e/p g eo la http://dx.doi.org/10.1016/j.pgeola.2015.12.010 0016-7878/ß 2016 The Geologists’ Association. Published by Elsevier Ltd. All rights reserved.