The Dawn Lantern
Charnwood Forest in the English countryside contains evidence of a violent past. Preserved in ancient volcanic dust, Auroralumina attenboroughii is a fossil that pushes back the origin of animal predators by at least 20 million years. Discovered in 2007 but first described in 2022, this organism lived 557-562 million years ago during the Ediacaran Period. Its name translates to "dawn lantern," a reference to its torch-like shape and its appearance near the beginning of animal life.
The single known specimen is about 20 centimeters (7.9 inches) tall. It consists of two goblet-shaped polyps that bifurcate from a central stalk. Unlike most other life forms of its time, Auroralumina had a rigid skeleton. This structure, preserved in three dimensions within slabs of siltstone, provided support. From the top of each "goblet," a crown of densely packed tentacles would have captured passing food particles. This anatomy makes Auroralumina the earliest known animal with a skeleton and identifies it as a cnidarian, the phylum that today includes jellyfish, sea anemones, and corals. Its predatory lifestyle is a step in the complexity of early ecosystems.
A Forest of Hidden Fossils
For centuries, the Precambrian rocks of Charnwood Forest were thought to be devoid of fossils. The scientific consensus was that complex life only appeared later, during the "Cambrian Explosion" 540 million years ago. This view changed in the 1950s. In 1956, a local schoolgirl, Tina Negus, found a clear impression of a frond-like organism, but her geography teacher dismissed the find. A year later, another student, Roger Mason, found an identical fossil. This time, the discovery reached geologists and was formally named Charnia masoni. The find proved that large complex organisms existed millions of years before the Cambrian.
The fossils of Charnwood Forest, including Auroralumina and Charnia, owe their preservation to ancient volcanoes. These deep-sea organisms were periodically buried by layers of fine volcanic ash, which settled on the seafloor. This process created detailed impressions, capturing the structure of their soft and semi-rigid bodies. The Auroralumina fossil was uncovered after a team from the British Geological Survey spent a week cleaning a 100-square-meter rock face with pressure jets and toothbrushes to reveal over 1,000 fossil impressions.