The spectacular fossil fauna and flora preserved in the Upper Cretaceous terrestrial strata of
North America's Western Interior Basin record an exceptional peak in the diversification of …

Despite dominating biodiversity in the Mesozoic, dinosaurs were not speciose. Oviparity
constrained even gigantic dinosaurs to less than 15 kg at birth; growth through multiple …

The terrestrial Judith River Formation of northern Montana was deposited over an
approximately 4 Myr interval during the Campanian (Late Cretaceous). Despite having been …

This study reports on a new ceratopsid, Spiclypeus shipporum gen et sp. nov., from the
lower Coal Ridge Member of the Judith River Formation in Montana, USA, which dates to …

Despite long-standing significance in the annals of North American stratigraphy and
paleontology, key aspects of the Upper Cretaceous Judith River Formation remain poorly …

During the past decade, three taxa of ceratopsid ornithischians have been described from
Mexico. Apparently, this group experienced a regional diversification in this area. To date …

The end-Cretaceous (K/Pg) mass extinction event is the most recent and well-understood of
the “big five” and triggered establishment of modern terrestrial ecosystem structure. Despite …

The horned dinosaurs (Ceratopsidae) were a diverse family of herbivorous dinosaurs
originating in the Late Cretaceous in western North America (Laramidia). As one of the most …

A cranium belonging to a baenid turtle was recently recovered from the lower half of the
Judith River Formation, Montana. Badlands Dinosaur Museum (BDM) 004 is a well …

Although ceratopsian dinosaurs have been excavated from the Judith River Formation for
more than a century, their diversity within the formation remains poorly understood due to …