In the silent landscapes of Alberta, a gray hill conceals the tangled remains of thousands of dinosaurs. Buried under layers of sediment since the end of the Cretaceous, these bones belong to a single species, the Pachyrhinosaurs, who died together in an episode as sudden as murderous. This cemetery of dinosaurs, of exceptional density, reveals a frozen moment of the past, a scene of natural disaster whose details are gradually emerging under the tools of paleontologists.
The most likely scenario? A sudden flood, caused by a violent storm or a torrential flood. The BBC reports that the sediments present on the spot testify to a quick and destructive water surge. Poorly equipped to face such a cataclysm, the pachyrhinosaurs – slow animals, in the high and unfinged center of gravity in the water – would have been quickly overwhelmed.
A dinosaurs cemetery frozen in the rock
What strikes researchers is not only the extent of the disaster, but the exceptional state of conservation of the site. The bone density is such that paleontologists must sometimes use hammers to clear the deepest layers. On each square meter, up to 300 bones piled up, according to Newsweek. There are ribs, femurs, skulls, often whole, sometimes exploded, but all belonging to a single species, the pachyrhinosaurus.
Such homogeneity makes this cemetery of dinosaurs particularly precious. Unlike traditional deposits, where the remains come from different periods and species, here, everything returns to a precise moment and a single community. For Interesting Engineering, this uniqueness offers a rare window on the social life of dinosaurs, far beyond the information usually available in isolated fossils.
A gold mine to understand life in herds
With specimens of all sizes – from juveniles to adults – researchers can now study the dynamics of an entire group. This abundance of data makes it possible to better understand growth, collective behavior and even individual variations within the same species. The documentary series Walking with Dinosaurs, produced by the BBC, stages this ancient drama with special effects based on fossil analyzes.
But the scope of the discovery does not stop at this herd. As The Telegraph points out, Pipepestone Creek could ultimately deliver clues to the global ecosystem of this late Cretaceous region. A few tens of kilometers, other sites have revealed the presence of Edmontosaurs, dinosaurs with duck beak which can reach ten meters long, also probably victims of similar disasters.
For the scientists of Philip J. Currie Dinosaur Museum, each new bone extracted from this compact mass is a piece of the puzzle. “It's a paleontological shot, but here, we don't just scratch the ground: we scratch the history of the living”, summarizes Emily Bamforth. And for good reason, these layers of rock tell an ordinary day that has become tragic, a turning point fossilized in the great story of evolution.
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