The mysteries of an ancient civilization that survived for more than a millennium on the island of Malta—and then collapsed within two generations—have been unravelled by archaeologists who analyzed pollen buried deep within the earth and ancient DNA from skulls and bones. It’s part of a field of work that is expanding the use of archaeological techniques into environments where they were previously thought to be unusable.
The Temple Culture of the Maltese archipelago in the Mediterranean began nearly 6,000 years ago and at its height probably numbered several thousand people—far denser than the people of mainland Europe could manage at the time. The island people constructed elaborate sacred sites, such as the famous Ġgantija temple complex, and their buildings are among the earliest free-standing buildings known. But, after 1,500 years, they were gone.
Caroline Malone, prehistory specialist at Queen’s University Belfast, Northern Ireland, wanted to understand how the fragile island ecology sustained the people for so long despite drought, violent storms, and soil erosion—and why it ultimately failed. She ran an ambitious project, Fragsus, drew on multiple tools to find some answers. Scientists drilled earth cores ranging from eight to 30 meters deep, dating the sediment using carbon dating to understand which time period it referred to. They counted the pollen at two-centimeter intervals and analyzed individual pollen grains using chemical signatures imprinted by the surrounding environment to understand what nutrients the parent plants were absorbing from the ground. Molluscs embedded in the soil revealed glimpses of the landscape since “snails,” Malone said, “are very particular about where they live and don’t move far.”
Meanwhile, other specialists assessed the wear and tear on tens of thousands of human bones from a burial site to understand the islanders lifestyles. The team broke new ground by analyzing bone with a technique called ancient DNA (aDNA) analysis, says Malone. It had previously been thought that the warmth of any climate south of the Alps would destroy such old DNA. But it turned out that skulls buried at a relatively cool five meters’ depth still harbored aDNA within thick bone behind the ear.
From what they’ve uncovered, the team thinks that these people understood the importance of soil management to fend off starvation. Within a hundred years of their arrival on the tiny, 316 square-kilometer archipelago they had felled most of the trees, exposing the ground to drastic erosion.
To survive, they reared dairy animals rather than prioritizing meat—killing off newborn livestock before they had a chance to graze. They mixed livestock manure back into the soil and may even have made back-breaking journeys carting soil washed into the valleys back uphill to refresh the upland fields. The evidence for this lies in strange, parallel ruts in the ground that may be cart tracks, as well as signs from the skeletons that soft tissue had sometimes been worn completely away by hard, repetitive activity. Oddly, says Malone, they ate almost no fish.
To achieve such complex collaborative effort something powerful must have held the community together: the temples. Until now, the Temple Culture was thought to have centered on the worship of a mother goddess, but Malone thinks it was more of a clubhouse culture, focused on ritual and feasting but where food—rather than a deity—was revered. In the complexes it is now clear that the people displayed their livestock and harvests on special benches and altars, feasted, and also stored food. There is no skeletal evidence of violent death and no fortifications, said Malone. Instead the society appears to have survived through cooperation and sharing.
Despite the society’s strength and success, as centuries passed the soil erosion and climate conditions worsened, as evidenced by the different types of pollen in the soil, the diminishing number of tree remains and the human bones wracked with evidence of dietary deficiencies. In the final centuries of the Temple Culture, between 2600 BC and 2400 BC, half of those dying were children. Other factors likely contributed, said Malone. Adult skulls from this time are greatly varied, their DNA indicating the arrival of immigrants from as far as the Eurasian Steppes and sub-Saharan Africa, possibly causing population pressure and new diseases.
The decisive blow may have been an unknown catastrophe that occurred around 2350 BC, a period during which, according to tree ring analysis, the whole region suffered a catastrophic climate event—possibly a dust cloud caused by a volcanic eruption.