A Sea Turtle Stampede Possibly Triggered by an Ancient Earthquake

Around 80 million years ago, a seismic event appears to have caused a large group of sea turtles to frantically move across the seafloor. Evidence of this ancient disturbance was discovered in 2019 by free climbers on a steep cliff overlooking the Adriatic Sea, a location generally off-limits due to rockfall hazards. They spotted a rock slab marked with unusual imprints and photographed it.

One climber later shared the images with Paolo Sandroni, a geologist and fellow climber at Italys Marche region Multi-Risk Functional Center. Sandroni and his team examined the site both on foot and using drones, uncovering more than 1,000 paddle-shaped fossilized footprints embedded in limestone, some of which had broken away and fallen to the beach below. This limestone originated from sediment once lying on a shallow seabed.

The footprints were dated to the Cretaceous period, roughly 83 to 80 million years ago, a time when sudden climatic changes, possibly linked to an asteroid impact, may have intensified seismic activity. Sandroni and colleagues suggest that the prints reflect a mass movement of sea turtles startled by an earthquake, as reported in Cretaceous Research.

Fossilized footprints from ancient seabeds are rare, as they are seldom preserved. The team believes these prints survived because sediment displaced by the quake quickly covered them. Considering the prehistoric marine fauna, potential candidates for these flipper marks included large extinct reptiles such as mosasaurs or plesiosaurs, along with sea turtles. Given the social and migratory behavior of sea turtles, they were deemed the most plausible trackmakers.

However, some experts remain skeptical. Anthony Romilio, a paleontologist at the University of Queensland, noted that the patterns do not resemble the spacing or anatomy typical of sea turtle flippers, suggesting the impressions could have non-biological origins. Despite this, the research team plans to collaborate with trace fossil specialists to further investigate these intriguing formations.

Analysis: Fossilized Footprints of Ancient Sea Turtles – A Seismic Discovery

The discovery of over 1,000 fossilized footprints in limestone, dating back around 80 million years, raises important questions about ancient marine life and seismic activity. Found by free climbers on a cliffside overlooking the Adriatic Sea, these imprints appear to capture the frantic movement of sea turtles reacting to a seismic event, possibly an earthquake. This theory is supported by the site's geological context and the date range, which coincides with a period of intensified seismic activity, potentially triggered by an asteroid impact.

While the research team, led by geologist Paolo Sandroni, firmly attributes these footprints to sea turtles, there is some debate in the scientific community. Paleontologist Anthony Romilio suggests that the pattern of the imprints does not match the typical anatomy of sea turtle flippers, casting doubt on the identification of the trackmakers. However, the team intends to collaborate with trace fossil specialists to delve deeper into the origins of these intriguing formations.

The rarity of fossilized footprints from ancient seabeds adds to the significance of this find. It underscores the importance of both environmental conditions and rapid burial by sediment in preserving such delicate traces. As further research unfolds, this discovery may offer more insights into the behaviors of marine reptiles during the Cretaceous period, as well as the environmental forces that shaped their world.

Sources:

• An Ancient Earthquake Might Have Unleashed a Sea Turtle Stampede

Author: Olivia Parker
Olivia Parker is a journalist and editor with over 8 years in media. She focuses on culture, arts, and social issues, skilled in feature writing and critical reviews.