Which geological stage defines the time period when Xenotarsosaurus lived?
Answer
Maastrichtian stage
The geological context pinning down the existence of Xenotarsosaurus places it squarely within the Maastrichtian stage of the Late Cretaceous period. This placement signifies that this dinosaur lived roughly between 72 and 66 million years ago, positioning it right before the catastrophic K-Pg mass extinction event that concluded the Mesozoic Era. Analyzing fossils found in Maastrichtian rock formations in Argentina, like those of Xenotarsosaurus bonapartei, provides essential data points for mapping out the diversity and predator-prey relationships among Gondwanan dinosaurs during the final moments of their dominance on Earth.

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