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A rich geobiological record of Cretaceous biotic and abiotic interactions around the protoGulf of Mexico has been preserved in the massive Cupido carbonate platform, i.e., in a sedimentary sequence that represents a depositional period of approximately 15 Myr. This work documents lateral facies variation on a dip slope reef from a new outcrop in the upper part of the Cupido Formation in the state of Nuevo Leon, Mexico. The measured transect is correlated with a stratigraphic column logged in a nearby section. The preserved fossil biota represents marginal reef facies dominated by abundant rudist shells such as Douvillelia skeltoni, Toucasia sp., Offneria sp., and Amphitrocoelus sp. associated with relatively large colonial corals (with diameters up to 25 cm) like Stelidioseris sp. and to a lesser extent, with stromatoporoids. Benthic foraminifers (miliolids and textularids) with associated dasycladalean algae such as Salpingorella sp. and Terquemella spp. dominate the microfossiliferous content in wackestones to packstones. This facies is overlain by a thin (15-30 cm) stromatolite horizon at the upper end of the measured section. This locality represents a new paleobiological and taphonomic window into one of the most extensive carbonate platform system developed along the margin of the Gulf of Mexico during the Cretaceous.  Resume : Une fenetre paleobiologique dans la Formation Cupido du Cretace inferieur : la coupe de Puerto Mexico, Nuevo Leon, Mexique.- Un enregistrement geobiologique diversifie des interactions biotiques et abiotiques cretacees sur le pourtour du proto-Golfe du Mexique a ete preserve au sein de l'imposante plate-forme carbonatee de Cupido, c'est-a-dire dans une sequence sedimentaire qui correspond a une periode de depot d'une duree approximative de 15 Ma. Ce travail met en exergue la variation laterale des facies recifaux sur le flanc long (faiblement pentu) d'un nouvel affleurement monoclinal correspondant a la partie superieure de la Formation Cupido dans l'etat de Nuevo Leon, Mexique. Le transect etudie est correle avec la colonne stratigraphique etablie dans une coupe proche. Le biote fossile preserve correspond aux facies de bordure du recif ou abondent les coquilles de rudistes, tels que Douvillelia skeltoni, Toucasia sp., Offneria sp. et Amphitrocoelus sp., ces derniers y etant associes a des colonies relativement grosses (avec des diametres atteignant jusqu'a 25 cm) de coraux tels que Stelidioseris sp. et, dans une moindre mesure, avec des stromatoporoides. Les foraminiferes benthiques (miliolides et textularides), en association avec des algues dasycladales telles que Salpingorella sp. and Terquemella spp., dominent le contenu microfossilifere des wackestones a packstones. Ce facies est surmonte a la partie sommitale de la coupe etudiee par un mince horizon stromatolithique (15-30 cm). Cette localite offre une nouvelle fenetre paleobiologique et taphonomique au sein de l'un des plus vastes systemes de plates-formes carbonatees developpees sur le pourtour du Golfe du Mexique au cours du Cretace.

A palaeobiological window into the Lower Cretaceous Cupido Formation: Puerto México section, Nuevo Leon, Mexico