A new approach to the correlation of the Upper Kimmeridgian Beckeri Zone across the Tethyan Sea

Abstract

Based on a preliminary attempt of high resolution subdivision of the Upper Kimmeridgian Beckeri Zone of Southern Germany into ammonite faunal horizons, and on recently collected ammonites from the Kachchh area (India), the lineage of the ammonite genus Hybonoticeras is outlined. In consequence it is now possible to make much more precise correlations around the Kimmeridgian/Tithonian boundary (Beckeri/Hybonotum Zones) all across the Tethyan realm and its adjacent areas (e. g. Submediterranean of Europe, Indo-East-African province, Mexico).