Ancient fossils from Hoste Island reveal unexplored paleontological frontier in Chilean Patagonia

Hoste Island sprawls across more than four thousand square kilometers of fractured terrain in Chilean Patagonia, nearly twice the size of Luxembourg and positioned like a sentinel between Navarino Island and Cape Horn National Park. For decades, it remained paleontologically silent—a blank space on the scientific map. That changed when Judith Pardo, a paleontologist at the University of Magallanes, organized the first systematic fossil survey the island had ever seen.

Pardo's expedition, funded through a Fondecyt Initiation grant and conducted in partnership with the International Cape Horn Center, was modest in scale but ambitious in scope. She traveled with Francisca Scappini, a graduate student in paleontology from the Austral University, and Carlos Rebolledo, a mountain guide. After days of navigation and barely into their fieldwork, the team made their first discovery: an ammonite, an extinct cephalopod mollusk that would anchor their findings in deep time. The creature had died between 120 and 130 million years ago, during the Aptian and Barremian periods, when the region's marine ecosystems were fundamentally different from anything that exists there now.

But the ammonite was only the beginning. The team pushed toward an unnamed peak—unnamed, at least, in the official records of Chile's Geographic Military Institute—and at its summit found something far rarer: a fragment of rock containing fossilized regurgitate, the preserved stomach contents of an ancient predator. These discoveries are uncommon enough to merit serious attention. Regurgitalites, as paleontologists call them, are windows into ancient food chains. They reveal what creatures ate, how they hunted, and how energy moved through ecosystems millions of years dead. On Hoste Island, Pardo explained, the evidence suggested the presence of smaller predators than those documented elsewhere in Magallanes, opening new questions about how marine life evolved in this remote corner of the world.

Yet Pardo believes the true discovery may not be the fossils themselves, but rather what their presence confirms: Hoste Island remains almost entirely unexplored. The island's difficult access, dense vegetation, towering sea cliffs, and scarcity of exposed rock formations have historically kept paleontologists away. The logistics are punishing. To reach places like Hoste requires days of ocean travel, passage through dense forests, and acceptance of a simple fact—any accident becomes a major emergency. Few researchers work in Magallanes at all, and fewer still venture to its most remote territories. This scarcity of scientific attention means that vast stretches of the region's geological and biological history remain unknown.

Paleontology in Magallanes operates under constraints that researchers in the developed north rarely face. The distance is real. The weather is unforgiving. The infrastructure is minimal. Yet each discovery from this corner of the planet carries weight beyond its immediate findings. The fossil record tells stories about how marine ecosystems responded to environmental change millions of years ago—information that becomes increasingly relevant as modern oceans face their own transformations. Understanding how life adapted to past climate shifts offers perspective on what current and future shifts might bring.

For Pardo and her colleagues, these discoveries also fill a gap in the region's own self-knowledge. Extensive research has documented the species that inhabit Cape Horn today, but the deep history of the place—the life that thrived there in the Cretaceous, the predators and prey, the structure of those vanished worlds—remains largely untold. That history is part of the region's identity. It shapes how people understand where they come from, what they inherit, and what they have a responsibility to protect. The fossils of Hoste Island are not just scientific data. They are pieces of a story about the natural world that has been waiting, in the rocks, to be read.