The uppermost Sinemurian and Sinemurian–Pliensbachian transition in Western and Northern Iberia: A chronostratigraphic review and correlation framework

Abstract

The uppermost Sinemurian and the Sinemurian–Pliensbachian transition represent a critical interval for Lower Jurassic chronostratigraphic correlation. This study presents a comprehensive review of published ammonite-based chronostratigraphic data for this interval, using the Polvoeira-Água de Madeiros (Lusitanian Basin, western Portugal) and Rodiles East (Asturian Basin, northern Spain) sections as key references. These sections are expanded and display a continuous and complete ammonite succession, allowing high-resolution correlation with the Pliensbachian GSSP at Robin Hood's Bay (UK).