Why the world's most important Coal Age fossils are hiding in plain sight

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: The Joggins Fossil Cliffs in Nova Scotia offer a rare window into a 310-million-year-old tropical rainforest. Thanks to the world's highest tides, these cliffs are constantly eroding, revealing a treasure trove of ancient life—including the earliest known reptiles—that helped shape our modern understanding of evolutionary history.

Located on the Cumberland Basin in Nova Scotia, the Joggins Fossil Cliffs are a UNESCO World Heritage site that serves as a premier record of the Pennsylvanian 'Coal Age.' During this period, approximately 310 million years ago, the region was covered by lush tropical rainforests. The site is uniquely significant because the daily high tides of the Bay of Fundy continuously erode the coastal cliffs, freshly exposing fossils that fall onto the shore, making it one of the most accessible locations globally for studying early terrestrial life.

The site's scientific importance was cemented in the mid-19th century by Charles Lyell, who famously declared the Joggins exposure the 'finest example in the world' of Coal Age rocks. The fossil record here was instrumental in early evolutionary debates, appearing in Charles Darwin's 'On the Origin of Species' and featuring in the 1860 Great Oxford Debate. Notable discoveries include 'Hylonomus lyelli,' the earliest known sauropsid, and 'Protoclepsydrops,' the earliest known synapsid. These finds provide critical evidence of the transition of vertebrates to land, as they represent animals capable of reproducing outside of water.

Beyond its paleontological value, Joggins has a rich industrial history. The exposed coal seams were exploited as early as 1686, eventually fueling large-scale mining operations that defined the community for centuries. Today, the Joggins Fossil Institute manages the site, coordinating research and operating the Joggins Fossil Centre. In 2022, the International Union of Geological Sciences recognized the cliffs as one of 100 premier geological heritage sites, cementing their status as a 'Coal Age Galápagos' that continues to yield insights into ancient ecosystems and mass extinction events like the Carboniferous Rainforest Collapse.

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