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The Kimmeridgian-Tithonian boundary in the Sierra Norte of Mallorca is revisited on the basis of preciseammonite biostratigraphy. According to eight ammonite assemblages identified, depositional conditions suddenly changed from ammonitico rosso to ammonite-poor brownish mudstones during a short time interval close to the Kimmeridgian-Tithonian boundary. The uppermost Alfabia Formation yields species...
A diversified and previously unknown record of microconchiate Hybonoticeras is analysed on the basisof the material collected in sections sampled bed-by-bed in the Mexican Altiplano. Five new species are described and compared to species traditionally recorded from the uppermost Kimmeridgian and the lowermost Tithonian in Europe. A general trend to smoothing in Mexican and European species during...
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