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Detailed stable carbon isotope, and biostratigraphic data based on ammonites allow us to reinterpret the timing of the different units of Madotz section (62 m-thick; Navarra, N Spain), relative to OAE-1a. We also made inference on bulk sedimentary rates and duration of the intervals that include facies indicative of oxygen depletion. The lowermost part of the sequence includes the predominately siliciclastic Unit 1 (3m) overlain in ascending order by subunits 2a (20 m), 2b (24.4 m) and 2c (basal 15 m studied) of the “Madotz Limestone”. Subunits 2a and 2c consist of Urgonian type pure carbonate rocks. In contrast, subunit 2b consists of carbonate-siliciclastic-mix facies (24.4 m-thick) including beds of claystone and clay-shale with dispersive pyrite, with scarce or absence of benthic foraminifera suggestive of oxygen-depleted conditions, and intermittent orbitolinid-rich intervals. δCorg data within subunit 2b, between 26.6m and 49.2m, shows two excursions of 4.21‰ and 3.34‰, separated by a central segment with more uniform values around -22.56%. Compared to the high-resolution δC stratigraphy of the early Aptian of the Alpine Tethys (Menegatti et al., 1998), these two positive excursions correlate with segments C4 and C6 of OAE-1a, whereas the central segment is correlative with segment C5, respectively. New ammonite findings include Deshayesites cf. forbesi Casey, and Pseudohaploceras? sp. in the uppermost part of Unit 1, as well as Deshayesites cf. forbesi Casey, Pseudosaynella bicurvata (Michelin), and Pseudosaynella raresulcata (d’Orbigny) in the middle part of subunit 2b. The presence of Deshayesites cf. forbesi in unit 1 (0–37.7 m) and subunit 2b (lower 14.7 m ), the first appearance datum of Pseudosaynella in subunit 2b, and the high relative abundance of

Lower Aptian Comparative Stratigraphy of the Basco-Cantabrian Region (Spain) and Eastern Cordillera (Colombia): implications for local factors in the depositional record of Oceanic Anoxic Event 1a (OAE-1a)