Abstract Borings of Apectoichnus longissimus and Teredolites clavatus are described from wood fragments preserved in sandstone deposits of the Maastrichtian (Upper Cretaceous) Monos Formation in central Cuba. In addition, palaeobiological, palaeoecological and taphonomic implications of these are inferred. The borings are interpreted as mainly produced by Teredinid marine bivalves, which inhabited driftwood substrates. The taphonomic features such as mode of occurrence, density and position of the borings within the relict log-grounds suggest: (i) post-burial compaction of the xylic substrates by the surrounding sediments during burial, (ii) different ontogenetic stages and colonization episodes of teredinids on the studied wood fragments and (iii) different residence time of the wood fragments floating or near the sediment–water interface. Furthermore, the accumulation of wood fragments with A . longissimus and T . clavatus in the shallow marine deposits of the Monos Formation was probably the result of a marine transgression event in these deposits, thus leaving them exposed to attack by teredinid larvae. This study explores the life histories and taphonomic histories of teredinid bivalves and wood fragments in the Monos Formation, adding to the literature on ichnofossils in this lithostratigraphic unit.

Abstract The Glossifungites ichnofacies can be a signature of allogenic processes that demark omission, exhumation and ravinement, or indicate autogenic processes impacting several depositional scenarios such as incised valleys, submarine gullies and canyons, erosive shorefaces, tidal channels and dewatered muddy substrates. Comparatively, autogenic surfaces demarked by the Glossifungites ichnofacies have been less studied than allogenic surfaces. In this study case, we interpret the examples from the transitional offshore to offshore deposits of the Devonian Ponta Grossa Formation (Paraná Basin, southern Brazil) as tubular tempestites. They are commonly associated with the initial phase of the transgressive systems tract when the shallow-marine environment becomes starved of sediment supply. Those occurrences are mostly characterized by Thalassinoides and less frequently by Palaeophycus , Skolithos and Rhizocorallium , with sharp to irregular walls, passive filling and descending from an erosive surface. In offshore deposits, the erosive surface can be obliterated, making the Glossifungites suite the unique evidence of storm processes (e.g. tubular tempestites). The results also highlight some differences between autogenic and allogenic Glossifungites from the Ponta Grossa Formation and demonstrate that the few levels with allogenic Glossifungites suites represent coplanar surfaces coupling sequence boundaries and transgressive surfaces developed in the early stages of transgressive systems tracts.