In the Ain region, the Dinoplagne site boasts the longest sauropod dinosaur track ever found worldwide. These footprints stretch an impressive 155 meters and date back nearly 150 million years to the Jurassic period. This incredible site allows visitors to glimpse a world long gone.
Dinoplagne stands out in the Jura mountains, differing from conventional museums filled with skeletons. Here, tangible dinosaur footprints remain embedded in rock, allowing people to connect directly with ancient history.
What makes Dinoplagne unique is its challenge to how we visualize dinosaurs. Instead of being merely illustrations in books, the footprints become almost alive. Their size, depth, and alignment reveal the movements of massive creatures once wandering these lands.
The Jura mountains are not just significant for their beauty; they played a vital role in geology, marking the Jurassic period when dinosaurs dominated Earth. According to a study in ScienceDaily, the clarity of the Dinoplagne footprints sets it apart from other fossil sites.
“They have been precisely dated to the early Tithonian (Late Jurassic), when the trackway site was located in a protected littoral mudflat,” researchers explain.
Visitors can witness remarkably preserved tracks that tell the story of a massive dinosaur. The sharp edges and clear details of the footprints make it feel like the dinosaur just passed by moments before.
In 2009, Dinoplagne gained even more fame when researchers identified it as home to the longest sauropod trackway ever recorded, according to findings in Geobios.
The dinosaur that left this trail was at least 35 meters long and weighed between 35 and 40 tons. It walked at a speed of about 4 km/h, showcasing the massive scale of these ancient creatures. The tracks extend over 155 meters, reshaping our understanding of dinosaur footprints.
Experts describe this site as a significant part of Europe’s largest dinosaur megatracksite. And for perspective, a titanosaur—often reaching 30 meters in length and 8 meters tall—left these footprints behind.
The clarity in the footprints, particularly the front foot tracks, provides details on how the creatures walked and interacted with their environment. This insight allows scientists to understand their movements better.
“The footprints are preserved to various degrees along the trackways, depending on initial sediment conditions. The best-preserved sections lead to the attribution of this specimen to Brontopodus plagnensis,” researchers noted.
Ongoing studies at Dinoplagne aim to uncover even more about these ancient giants. The site remains open to the public, offering an unforgettable look at a fascinating past.

