Chrono-, litho- and conodont bio-stratigraphy of the Rauchkofel Boden Section (Upper Ordovician – Lower Devonian), Carnic Alps, Austria

Abstract

An updated stratigraphy of the Rauchkofel Boden Section, a classical reference section for the Carnic Alps that exposes rocks from the Katian (Upper Ordovician) to the Pragian (Lower Devonian) is here presented, following latest developments in conodont taxonomy and biostratigraphy, as well as in chronostratigraphy, and the recent introduction of a new lithostratigraphic outline of the Carnic Alps. The original conodont collection of the '70s and ʼ80s was restudied and complemented by a detailed resampling in order to achieve a more precise conodont biostratigraphic assignment. Twenty-five conodont Zones are now documented. The lithostratigraphy is precisely fixed to the new lithostratigraphic scheme of the Pre-Variscan sequence by definition of seven distinct formations. Finally, the position of chronostratigraphic boundaries is discussed. eschweizerbart_xxx eschweizerbart_xxx Chrono-, litho-and conodont bio-stratigraphy of the Rauchkofel Boden Section 447 Fig. 2.Chronostratigraphy and lithostratigraphy of the Rauchkofel Boden Section. Stratigraphic log modified after Schönlaub (1980). Lines on the right side of the log indicate the parts of the section illustrated in Figs. 3-6.eschweizerbart_xxx Chrono-, litho-and conodont bio-stratigraphy of the Rauchkofel Boden Section 451 eschweizerbart_xxx

First documentation of the Polygnathoides siluricus conodont Zone (Ludfordian) in South America (Argentina) and the stratigraphic significance of the younger species of Kockelella (Conodonta)

“…However, in the Cellon section at the top of the P. siluricus Zone, a hardground is present, suggesting a short hiatus between the Cardiola and the Alticola formations. This is confirmed by the occurrence of P. latialata (Walliser) in the lowermost bed of the Alticola Formation at Cellon, whereas in other sections in the area (e.g., Rauchkofel Boden: Schönlaub et al, ; Cuestalta: Corradini, unpublished data) the basal beds of this unit still belong to the P. siluricus Zone.…”

“…Boden: Schönlaub et al, 2017;Cuestalta: Corradini, unpublished data) the basal beds of this unit still belong to the P. siluricus Zone.…”

“…Thus the K. o. absidata Zone now includes the upper Homerian strata. At Gotland, K. o. absidata ranges only in the upper Homerian (Calner & Jeppsson, ), whereas elsewhere, occurs up to the P. siluricus Zone (e.g., Corradini et al, ; Schönlaub, Corradini, Corriga, & Ferretti, ; Serpagli & Corradini, ; Slavík, ). The occurrence of K. o. absidata in Argentina together with K. maenniki confirms the long ranging of the species up to the P. siluricus Zone.…”

Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China

“…Conodont‐based Silurian biostratigraphy is well established, and a high‐resolution biozonation has been worked out (Corradini & Corriga, ; Corradini, Corriga, Männik, & Schönlaub, ; Cramer et al, ; Jeppsson, Eriksson, & Calner, ; Männik, ; Schönlaub, Corradini, Corriga, & Ferretti, ; and references in these papers). Due to the sporadic and rare occurrences of biostratigraphically determinative taxa, identification of conodont biozonal units in the Laojianshan section is complicated, and only a few intervals can be dated reliably (Figure ).…”

“…sagitta sagitta Biozone, is represented (Figures and ), since Ps. linguicornis is known to occur only in this biozone (e.g., Corradini, ; Corradini et al, , ; Männik, ; Schönlaub et al, ). Hence, the Oz.…”