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Volcanoes are more than just jagged peaks expelling molten rock. They stand as some of Earth's mightiest geological forces, capable of dramatically altering landscapes. Yet, even dormant volcanoes can hold priceless archaeological and geological treasures.
Frequently, the discoveries found within or around volcanoes shed light on ancient beliefs and secrets from a time when these natural giants were considered sacred. Even in their wake, hidden within layers of ash and volcanic glass, researchers are unearthing entire forests, ancient oceans, and pieces of human history.
10. A Fossil That Foretold the Future
Around 90 million years ago, a large aquatic bird met its end in what is now the Canadian Arctic. Known as Tingmiatornis arctica, this bird resembled a hybrid of a cormorant and a seagull.
When discovered in 2016, this ancient bird not only became one of the oldest known species in the northern hemisphere, but it also overturned a long-standing belief. Scientists had previously thought that intense global warming occurred between 93.9 and 89.8 million years ago. Despite this heat wave, it was assumed that the Canadian Arctic still experienced seasonal ice.
However, the presence of Tingmiatornis in the region makes that theory impossible. Its physical traits suggest it was capable of diving for food, a feat that would have been obstructed by ice, preventing the species from surviving or lingering in the area.
Other fossils and soil samples revealed that the bird inhabited a vastly different Arctic—a hot, volcanic landscape teeming with dinosaurs and reptiles. These volcanoes released massive amounts of carbon dioxide, triggering a greenhouse effect. Through Tingmiatornis, we gain insight into an ancient ecosystem and a glimpse into a future where the Arctic might be too warm for ice.
9. A Miniature Universe
Nestled near Mexico’s Iztaccihuatl volcano lies an extraordinary pond. While the lake itself is already a stunning sight, a recent draining of the water revealed a stone shrine hidden beneath. The Aztec architects showcased their ingenuity by arranging the stones to reflect the pond's surface, making the shrine appear as though it were floating underwater.
At the base of the Iztaccihuatl volcano, this tetzacualco (“shrine”) is part of a collection of discoveries at the Nahualac archaeological site (AD 750–1150). Many of these artifacts, including pottery, rock fragments, and organic remains, have been connected to Tlaloc, the Aztec god of rain.
Since the shrine is clearly a sacred space, archaeologists speculate that its design reflects the Aztecs' view of the universe. It not only represents the stars visible to them at night but also serves as a symbolic model of their mythical world. The entire site, which includes a valley with springs that feed the pond, may have been designed to evoke the primeval waters from which the Aztecs believed all life originated.
8. An Outlaw’s Cave
In 2014, a group of cave explorers decided to venture into Snaefellsnes National Park in Iceland. While exploring the Neshraun lava field, they discovered a cave that contained ancient artifacts. Inside, they found signs of a small fireplace, horse bones, and what seemed to be remnants of a bed. The artifacts were estimated to be around 900 years old.
Experts speculate that someone might have sought refuge there during the 11th or 12th centuries. However, the reason behind their decision to take shelter in the cave remains a mystery.
What was clear, however, was the individual’s disregard for the law. The horse bones found inside appeared to belong to an animal that had been butchered for a meal. Following Iceland’s adoption of Christianity in AD 1000, eating horse meat was prohibited. Even before this decree, consuming horse meat was rare.
This made the cave dweller’s choice of meal not only illegal but also highly unconventional. The mystery remains a thrilling discovery for explorers, who believe this find points to even more archaeological surprises hidden within Iceland’s lava fields.
7. Enormous Rings
Within South Africa’s Pilanesberg National Park lie circles so vast they resemble massive mountains and deep valleys. In reality, these formations are the remnants of an ancient volcano that erupted repeatedly throughout history.
A NASA satellite captured enough detail to uncover the entire life cycle of the billion-year-old volcano. It started as a small “hot spot,” accumulating lava that eventually erupted with overwhelming force and magnitude.
However, not all of the magma was expelled. Some cooled and solidified beneath the Earth’s surface, filling circular cracks and taking their shape. These formations, known as ring dikes, are incredibly rare, with only a few existing worldwide.
Over the course of the volcano’s million-year existence, this cycle repeated multiple times. Each eruption left behind a new underground ring. Eventually, the Pilanesberg volcano became dormant after the shifting of continental plates moved it away from the hot spot.
The ensuing millennia eroded the site, causing the nearly perfect circular dikes to rise to the surface. The highest point is Matlhorwe Peak, standing at 1,560 meters (5,118 feet) above sea level.
6. A Fossilized Forest
Around 300 million years ago, a volcanic eruption sealed a tropical forest in an eternal moment of time. The forest, once flourishing in what is now Inner Mongolia, was buried under a thick layer of volcanic ash, nearly 100 centimeters (39 inches) deep, during the catastrophic event.
At that time, Earth had no continents apart from the supercontinent Pangaea. Yet, even after being buried for so long, the newly discovered plants remained in remarkable condition. For researchers, it was like a child entering a candy store, offering a glimpse into trees and foliage that had once unified the Permian-era ecosystem.
The layer of ash wasn't thick enough to preserve standing trees, but some trees had fallen during the eruption and were subsequently covered by the ash. This rare find provided an exceptional view of the forest’s various layers.
The upper canopy was formed by tree species 25 meters (82 feet) tall, such as those from the genera Sigillaria and Cordaites. Beneath the first canopy, a secondary layer was composed of tree ferns. At the forest floor, there were communities of cycads and Noeggerathiales (extinct spore-producing trees).
5. The Campanian Ignimbrite
In 2012, researchers revisited an ancient super-eruption that took place in Italy. The Campi Flegrei volcano erupted violently around 39,000 years ago, becoming Europe’s largest eruption in the past 200,000 years.
To gain a deeper understanding, the team concentrated on the Campanian Ignimbrite, the vast ash deposits left by the eruption. After studying 115 locations for precise measurements, they reconstructed the event and concluded it was truly monumental.
The eruption expelled between 250 and 300 cubic kilometers (60–72 mi) of ash across an area of 3.7 million square kilometers (1.4 million mi). This new data surpassed earlier estimates, which had suggested the eruption's volume was up to three times smaller.
Additionally, 450 million kilograms (990 million lb) of sulfur dioxide were released. This toxic cloud helped cool an already freezing Ice Age and may have led to the extinction of Neanderthals and humans in the eastern Mediterranean, forcing survivors to flee.
The ash contained fluorine, which infiltrated the plants consumed by both groups, likely causing fluorosis in some. This condition damages internal organs, teeth, and eyes.
4. Toba Reduced the Human Gene Pool
Between 50,000 and 100,000 years ago, humans faced the threat of extinction. The limited genetic diversity of modern populations suggests that our ancestors were few in number, leading to a loss of genetic variation.
In 2009, a key piece of evidence was discovered regarding humanity’s fragile survival. Around 73,000 years ago, a volcano erupted on the Indonesian island of Sumatra, releasing an enormous amount of ash into the atmosphere. This eruption, known as the Toba eruption, dwarfed even the Neanderthal-destroying Campi Flegrei eruption, blocking sunlight for six years.
While the Campi Flegrei eruption caused temperatures to drop by 1–2 degrees Celsius (1.8–3.6 °F), the Toba eruption led to a drastic 16-degree Celsius (28 °F) plunge. This cooling event triggered an Ice Age that lasted for 1,800 years. The eruption may explain why humans came dangerously close to extinction, but further evidence was still needed.
In their study, researchers collected ash from the Toba eruption and discovered ancient plant remains. The findings highlighted extensive environmental devastation. For a millennium following Toba, vast swaths of India’s forests were lost, replaced by sparse vegetation adapted to arid climates.
The cooler temperatures led to reduced rainfall, showing that Toba’s eruption triggered both deforestation and colder weather. This shift in climate likely posed a serious threat to human survival, pushing humanity toward extinction.
3. The False Volcano
In Peru, a peculiar mound stands nearly 15 meters (50 feet) tall. In the 1960s, archaeologists in the Nepena Valley took note of the structure. Though they recognized it as man-made, it was merely documented and not further investigated. True to its name, El Volcan bears a striking resemblance to a volcano.
In 2017, a comprehensive investigation added to the mystery of the pyramid. The identity of its creators, who built it between 900–200 BC, and the reasoning behind its cinder cone shape remain unknown. Three main theories emerged—looters, erosion, and a deliberate attempt by the builders to create a fake volcano.
However, erosion alone cannot account for the missing material from the inner pit—about 2,135 cubic meters (75,400 ft) of material. If looters were responsible, they would have discarded it at the site, but they would not have stayed long enough to convert the area they were plundering into a cone.
The only logical conclusion is that the original builders intentionally designed it this way. A hearth found inside El Volcan, dating to around AD 1563, offers a clue about the pyramid’s function. A series of eclipses had occurred in the years before, and these events were widely celebrated by the local people. This suggests the volcano might have been part of those festivities.
2. Ancient Water In Glass
Deep-sea volcanoes revealed a previously unknown process. Scientists had already established that seawater carries hydrogen and boron isotopes to the ocean floor. But as tectonic plates sink deeper into the mantle, they become more devoid of seawater and its chemical elements.
For scientists studying the cycle of ancient water, it was like trying to examine a fingerprint with no lines. At some stage, the hydrogen and boron isotopes seemingly vanish, as if the seawater that reaches the mantle simply disappears.
Yet, the Manus Basin in Papua New Guinea revealed the truth. There, underwater volcanoes erupted 1.6 kilometers (1 mile) below the surface, and the pressure at this depth trapped water inside volcanic glass. When the glass was analyzed, scientists discovered a surprising result: the seawater came from deep within the mantle and had been preserved for a billion years.
This finding indicated that plates which had sunk long ago could eventually resurface. It also showed that surface water doesn't always vanish when it travels with plates into Earth's depths. The geology of the Manus Basin appears to be unique, with volcanoes releasing a blend of hydrogen and boron isotopes found nowhere else. This fusion of ancient seawater with today's ocean offers valuable insight into Earth's water and element recycling processes.
1. Where Africa Breaks In Two
Africa is in the midst of creating a new island, a process that will take around 10 million years to complete. However, in Ethiopia, things are accelerating. In 2005, scientists observed a rapid split. Within just 10 days, a crack opened up 8 meters (26 feet) wide and extended for 60 kilometers (37 miles). This is the result of underground eruptions and molten lava pushing toward the surface. Surprisingly, this crack marks the beginning of a new ocean.
As volcanic activity continues to widen the fracture, the Horn of Africa will eventually break away from the rest of the continent. The southern parts of Ethiopia and Somalia will become an island, as a new sea flows in between, separating them from the shrinking landmass.
The speed at which this transformation is occurring is extraordinary. Such changes typically take millions of years, but this unusual continental crack is defying expectations. For geologists, this is a rare opportunity to witness the formation of a completely new sea, a process usually hidden deep under the ocean.
