Footprints of tail-clubbed armored #dinosaurs found for the first time https://phys.org/news/2025-04-footprints-tail-clubbed-armored-dinosaurs.html paper by Victoria Arbour et al.: https://www.tandfonline.com/doi/full/10.1080/02724634.2025.2451319

"The tracks date back to the middle of the #Cretaceous period, about 100 to 94 million years ago. No bones from #ankylosaurids have been found in North America from about 100 to 84 million years ago... These footprints show that tail-clubbed ankylosaurs were alive and well in North America during this gap in the skeletal fossil record."