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in Fanti, Consorti, Muscioni, Baldassari, Dinelli, Polentarutti, ... et Chiarenza. 2026. Artwork by palaeoartist Davide Bonadonna |
Highlights:
• Monsoon-driven storms created a Cretaceous dinosaur Lagerstätte.
• Tidal microcouplets yield an unprecedented ∼40-year chronometry.
• Synchrotron micro-XRF/XRD maps refute seasonal varve interpretation.
• Microbial mats enabled rapid sealing and exceptional soft-tissue preservation.
• New genetic model and toolkit for climate event-driven preservation in carbonates.
Abstract
Konservat-Lagerstätten provide exceptional records of past ecosystems, yet the environmental and climatic processes governing their formation in extreme climatic regimes remain a significant, unresolved conundrum. Here we present a novel, process-based mechanism for the Villaggio del Pescatore Konservat-Lagerstätte (northeastern Italy; Late Cretaceous, 80 Ma), which preserves a diverse terrestrial and aquatic biota. Integrating high resolution synchrotron micro-analyses, bulk geochemistry, detailed taphonomy and palaeoclimate simulations we identify a dynamic, monsoon-paced tidal flat ecosystem within a carbonate coastal margin. Field and core records comprise metrescale packages of laterally persistent light–dark laminae; microstratigraphic, spectral and statistical analyses indicate a semidiurnal tidal regime with neap–spring modulation. MicroXRF/XRD mapping reveals that individual microlaminae within couplets share the same elemental inventory refuting a seasonal varve origin. Laminae chronometry, tied to the tidal interpretation, constrains net accumulation of the fossil bearing rhythmites to decadal (∼40 year) timescales. Geochemical proxies record alternating terrigenous rich, high TOC intervals and drier, better oxygenated intervals. Palaeoclimate model ensembles diagnose a vigorous, summer dominated monsoon domain at ∼29° N under greenhouse boundary conditions. We document that episodic monsoon enhanced flood and tropical cyclone pulses delivered sediment, nutrients, carcasses and plant debris to a microbially active, carbonate tidal flat; microbial mats rapidly stabilised and promoted early cementation, enabling exceptional soft tissue preservation. We propose a genetic model in which monsoon–cyclone forcing, tidal trapping and microbial sealing combine to produce decadal, daily resolved vertebrate Lagerstätten in greenhouse settings, offering predictive targets for similar deposits and deep time analogues for modern coastal change.
Keywords: Exceptional fossil preservation, Dinosauria, Crocodylomorpha, Arthropoda, Plants, Italy
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| “Stormbringer” — palaeoenvironmental reconstruction of Villaggio del Pescatore The artwork shows a Tethyshadros insularis carcass and an Acynodon crocodylian on a storm-swept tropical tidal flat, beneath the monsoon clouds and a distant cyclone that the study identifies as the engine of the site’s formation. by palaeoartist Davide Bonadonna. |
Federico Fanti, Lorenzo Consorti, Marco Muscioni, Lorenzo Baldassari, Enrico Dinelli, Maurizio Polentarutti, Giorgio Bais, Alexander Farnsworth, Evelyn Kustatscher, Amalia Spina and Alfio Alessandro Chiarenza. 2026. Climate-extreme-driven Genesis of A Cretaceous Dinosaur Lagerstätte. Global and Planetary Change. 265, October 2026, 105589. DOI: doi.org/10.1016/j.gloplacha.2026.105589
