The discovery, published in the journal Science Advances, documents an exceptionally well-preserved fossil deposit dating back almost 63 million years. This estimate places the deposit only a few million years after the mass extinction event that wiped out nearly three-quarters of life on Earth at the end of the Cretaceous period.
Researchers say the site, described as a rare “Lagerstätte,” contains hundreds of well-preserved marine fish fossils, including more than 20 previously unknown species, making it one of the richest early Paleocene fossil assemblages identified globally.
Unlike earlier fossil sites that typically reflect shallow marine environments, the Egyptian site represents an open ocean ecosystem. Scientists say this provides a rare snapshot of how marine life recovered and reorganized in the aftermath of a global ecological collapse.
Professor Hisham Sallam, who led the Mansoura University Vertebrate Paleontology Centre team behind the discovery, said the findings challenge long-standing assumptions about the pace of marine evolution following the extinction event.
“The fossil record here suggests that modern groups of fish diversified far earlier and more rapidly than previously thought,” Sallam said, noting that many of the species belong to Percomorpha, a major group that today includes tuna, mackerel, and seahorses.
The study also found a notable absence of several dominant predatory fish species that had previously ruled prehistoric seas, supporting the theory that the extinction event triggered a complete restructuring of marine food chains.
Researchers say this ecological reset likely opened the door for modern fish lineages to expand and occupy new ecological roles, reshaping ocean biodiversity in a relatively short geological time span.
The project took more than six years and involved collaboration between Mansoura University, the University of Michigan, and the University of Leuven, with additional support from Egypt’s Science, Technology, and Innovation Funding Authority and the National Geographic Society.
Dr. Sanaa El-Sayed, the study’s lead author, said the site provides a rare window into how marine ecosystems recover after catastrophic events, particularly under the conditions of global warming that marked the early Paleocene period.
Experts involved in the research say the discovery strengthens Egypt’s position as an emerging hub for vertebrate paleontology, with the Eastern Desert increasingly recognized as a key region for understanding ancient marine evolution.
The findings not only revise scientific understanding of early modern fish evolution but also highlight how rapidly ecosystems can reorganize after mass extinction events — a question with growing relevance in the context of today’s climate change concerns.
Short link: