GeochemistryPublished 8 March 2023Geochemical factors associated with deposition of lower Aptian organic-rich sediments during OAE1a in the Basque-Cantabrian Basin, northern SpainCarlos Herdocia · Florentin J-M. R. MaurrasseFrontiers in Geochemistrydoi 10.3389/fgeoc.2023.1080169