Researchers in the Jura region, near the village of Plagne, have uncovered a remarkable fossil track measuring 155 meters with 110 distinct imprints. This discovery is attributed to a previously unknown sauropod species, named Brontopodus plagnensis. The track was found approximately 200 kilometers east of Lyon and is described as a world record for a sauropod, a group of large, long-necked dinosaurs. The name Brontopodus plagnensis reflects both the thunderous sound of its footsteps and the location of its discovery. The dinosaur, estimated to weigh around 35 tonnes and measure 35 meters in length, is believed to have moved at a speed of 4 kilometers per hour, with each stride covering about 2.8 meters. These estimates were derived from the analysis of the imprints, which were preserved in soft mud. Over time, layers of sediment protected the track, and tectonic uplifts eventually exposed it to researchers. The area where the track was found was once a tropical island 150 million years ago, covered by a warm, shallow sea. The discovery of Brontopodus plagnensis provides valuable insights into the movement, size, weight, and speed of this ancient creature. It also highlights the significance of the Jura region in the study of sauropod history. This region, often seen as a peaceful and quiet part of France, is emerging as a key location for uncovering the secrets of prehistoric life. The identification of Brontopodus plagnensis marks the first time this species has been recorded, offering scientists a rare glimpse into the behavior and characteristics of a previously unknown dinosaur. The discovery underscores how even seemingly unremarkable areas can hold ancient treasures, waiting to be uncovered by modern research.