17,000-year-old cave paintings in Wales confirmed as the oldest rock art in the British Isles

Scientists have confirmed that a series of red markings inside a cave in Wales represent the oldest known rock art in the British Isles, bringing an end to a debate that lasted for more than a century.

The artwork lies deep inside Bacon Hole, a cave in the limestone cliffs of the Gower Peninsula in South Wales. Archaeologists first identified the markings in 1912. At the time, researchers believed they had found the first example of Upper Paleolithic cave art in Britain. Their interpretation soon faced criticism, and by the late 1920s many scholars argued that the lines were natural features rather than human-made paintings.

The painted panel then faded from academic attention. Its exact location inside the cave was gradually forgotten, leaving the question unresolved for decades.

A new international research project returned to the site in 2022 and relocated the panel. The team carried out pigment studies, dating work, and detailed surveys of the cave wall. Their findings support the original conclusion reached by the first investigators more than 100 years ago.

The panel consists of at least ten horizontal red lines arranged in a regular pattern. Researchers found that the pigment contains high levels of hematite, an iron-rich mineral widely used as a red coloring material in prehistoric art. Laboratory analysis showed traces of clay mixed with the pigment, suggesting deliberate preparation before application.

The spacing of the lines provided another clue. Each line runs parallel to the others, creating a pattern unlikely to result from natural processes. Researchers found no similar formations elsewhere on the cave walls. Finger marks, dots, and small pigment splashes found in the chamber strengthen the case for human activity.

To determine the age of the artwork, scientists collected samples from calcite deposits that formed over the painted surface. Uranium-thorium dating placed the paintings between about 18,300 and 15,700 years old. The results suggest an age of roughly 17,000 years, making Bacon Hole the earliest known rock art site in the British Isles.

The paintings were created during a period when Wales was emerging from one of the coldest phases of the last Ice Age. Around 17,000 years ago, the landscape looked very different from today. Large areas remained treeless, and the region around the present-day Bristol Channel formed part of an open plain where grazing animals moved seasonally across the landscape.

Although archaeologists have found no evidence of permanent occupation inside Bacon Hole from this period, the cave would have offered shelter to groups of hunter-fisher-gatherers living in the area. The painted panel occupies a secluded chamber at the rear of the cave, far beyond natural daylight.

Researchers believe the location itself holds significance. Creating art in a dark and isolated part of the cave suggests the space served a purpose beyond daily activities. The meaning of the red lines remains unknown, and no evidence links them to a specific ritual or belief. Even so, the paintings point to symbolic behavior among people living in Britain near the end of the Ice Age.

Bacon Hole continued to attract visitors long after the paintings were created. Archaeologists have recovered artifacts from many different periods, including pre-Roman pottery, Roman objects, early medieval jewelry, Saxon beads, and medieval household items. The repeated visits suggest that generations of people returned to the cave over thousands of years.

Researchers stress that further sampling and analysis are needed. Additional studies of other painted surfaces inside the cave could provide a clearer picture of human activity at the site. Current evidence leaves little doubt about one point. The red lines at Bacon Hole represent genuine Paleolithic art, restoring the cave’s place among the earliest known centers of symbolic expression in the British Isles.