Fig. 6

Conceptual integration of the results from niche modelling and geological modelling of fossil occurrences. Eustatic (blue shaded bar on top) and tectonic (top green shaded bar) drive the distribution of depositional environment affecting fossil preservation. Campanian palaeogeography (left) fosters increased and more widespread preservation of fossil communities than the Maastrichtian (right) due to the higher accommodation space provided by the highstand of the Western Interior Seaway (left) than during the late Maastrichtian regressive phase (right). On the other hand, the latter time interval (right) may have provided equal if not greater habitable space in terrestrial areas, which are not captured by the geologic record. Diagram at the bottom shows how a high Maastrichtian habitat suitability (red line) is not in phase with the lower preservation potential of this stage, causing lower taphonomic suitability than in the Campanian. This combination of conditions provide a depauperate raw diversity record for non-avian dinosaurs towards the K/Pg. Chasmosaurinae silhouette by Mariana Ruiz (modified by T. Michael Keesey) under the Public Domain Mark 1.0. Saurolophinae silhouette by Pete Buchholz (under CC BY-SA 3.0 license: https://creativecommons.org/licenses/by-sa/3.0/); Tyrannosaurinae silhouette by Jack Mayer Wood (CC BY 3.0: https://creativecommons.org/licenses/by/3.0/ CC BY 3.0); Centrosaurinae silhouette by Andrew A. Farke (under CC BY 3.0: https://creativecommons.org/licenses/by/3.0/); Lambeosaurinae silhouette by Jack Mayer Wood (under CC0 1.0); and Albertosaurinae silhouette by Craig Dylke (under CC0 1.0)