Magnetostratigraphy of the Punta Grohmann section (Dolomites, Italy): improving the chronology of the Ladinian/Carnian boundary

• Published in: Palaeogeography, palaeoclimatology, palaeoecology palaeoclimatology, palaeoecology, 2024-04, Vol.639, p.112077, Article 112077
• Main Authors: Maron, Matteo, Muttoni, Giovanni, Mietto, Paolo, Gianolla, Piero
• Format: Article
• Language: English
• Subjects: GPTS; Paleomagnetism; Triassic
• ISSN: 0031-0182; 1872-616X
• DOI: 10.1016/j.palaeo.2024.112077

We provide the magnetostratigraphy of the Ladinian/Carnian Punta Grohmann stratigraphic section (Dolomites, Italy), calibrated with UPb ages from the literature (237.58 ± 0.04 Ma; 237.68 ± 0.05 Ma). The FO of ammonoid Zestoceras lorigae, the base of the vigens-densus palynomorphs Zone, and sequence stratigraphy suggest a Carnian age for the upper part of the section, which has been confirmed by the magnetostratigraphic correlation between Punta Grohmann and Prati di Stuores (Carnian GSSP). Additional magnetostratigraphic correlation between Punta Grohmann and key time-calibrated Ladinian–Carnian sections from the literature (e.g., Mayerling, Seceda, Rio Nigra) lead to a more precise age of the Carnian base (∼236.5 Ma) and to a better definition of the Middle–Late Triassic Geomagnetic Polarity Time Scale. •New magnetostratigraphic data of a UPb constrained Ladinian section improves Triassic chronology.•The Punta Grohmann time-calibrated magnetostratigraphy allowed the update of the Ladinian Geomagnetic Polarity Timescale.•Updated Geomagnetic Polarity Timescale led to a revised age of the Ladinian/Carnian boundary (∼236.5 Ma).