The Fossils That Had Been Carved

On 31 May 1725, three boys brought Johann Beringer three stones from a hill outside Würzburg. They were not ordinary stones. One carried the shape of an insect. Others, as the summer progressed, would show spiders on webs, birds with eggs, plants with roots, suns, moons, comets and tablets covered in Hebrew, Arabic and Latin characters. The hill seemed to be producing a catalogue of creation in limestone.

Beringer was perfectly placed to appreciate the miracle. He was a physician, professor and dean of the medical faculty at the University of Würzburg, as well as physician to the local prince-bishop. He collected what early modern Europe called fossils: anything dug from the earth, including minerals, curious rocks and what we would now call fossils. The ordinary ammonites and shells near Würzburg bored him. These new objects did not.

He called them iconoliths, image-stones. Within months, he had acquired roughly 2,000. In 1726 he published engravings of 204 of the most astonishing examples in Lithographiae Wirceburgensis. The book made a claim that was stranger than its stones: nature itself, properly understood, could make pictures.

The hill started talking

The fraud depended on a useful gap in knowledge. In the early eighteenth century, a fossil was not yet securely defined as the preserved remains of an organism. “Petrefactions” resembled shells, bones or plants, but the resemblance raised more questions than it answered. Were they remnants of Noah’s Flood? Products of mineral vapours? Shapes stamped into rock by some formative force? Extinction was not an easy idea in a world whose perfect creation was assumed to have no mistakes.

Beringer’s collection arrived in that unsettled space. The stones were carved from the local limestone, but the carvings were not necessarily intended to imitate known fossils. Some were tiny animals; others were impossible scenes. A spider appeared with its web. A bird sat beside eggs. A plant had a complete root, stem and leaves. Celestial objects appeared alongside writing. The impossibility was the point: these were not merely dead organisms turned to stone. They looked like nature had acquired an artist and a sense of humour.

Beringer did not simply accept them without thought. He assembled explanations from the natural philosophy available to him. His favoured account proposed that light was a material substance capable of impressing images on stone, much as a camera obscura formed an image. Sunlight, moonlight and the reflections from a Jewish cemetery could account, in his view, for the celestial bodies and Hebrew letters. It was an ingenious theory because it made the strangest specimens evidence for itself. The more unlike ordinary fossils a stone was, the more it seemed to require a new mechanism.

The diggers helped the illusion along. Christian Zänger, aged seventeen, and the brothers Niklaus and Valentin Hehn, aged eighteen and fourteen, brought the pieces from the slopes of Mount Eibelstadt. One boy knew more about the deception than the others. The stones appeared in a place where Beringer had searched before, but he now examined the familiar hillside with the expectation that it contained wonders. A landscape can change when a collector learns what he hopes to find.

When stone became an argument

The practical joke became an academic problem when Beringer began writing his book. His colleagues J. Ignatz Roderique and Georg von Eckhart tried to tell him that the stones were manufactured. They reportedly carved examples to demonstrate the method. Beringer treated the warning as an attempt to discredit him. If a few specimens were false, that did not explain the hundreds he had handled, the witnesses who had found them or the stones that had been dug out in front of visitors.

This was the trap’s most effective feature. A single fake can be dismissed. A whole social world of fakes is harder to see. The boys had supplied specimens. Visitors had examined them. Beringer had paid for them, catalogued them and compared them. His confidence was no longer attached to one piece of limestone; it was attached to the accumulated behaviour of everyone around it.

He also had a manuscript to defend. The evidence had become an argument, and the argument had become a book. In its pages, the stones were not just curiosities but an answer to competing theories about how the earth made visible forms. The images gave him a new natural philosophy. Doubt would not mean rejecting an object. It would mean dismantling a system he had built around it.

Lithographiae Wirceburgensis appeared in 1726. Its engraved plates preserved the creatures more successfully than the stones preserved the deception. A later count identified 204 illustrated specimens, probably only a fraction of the original collection; estimates suggest that more than 1,100 may have existed. The book turned a temporary trick into a durable archive.

The warning arrived too late

The standard version of the story supplies a neat ending. Beringer discovers that one of the stones bears his own name, understands that he has been mocked, recalls the book and takes his colleagues to court. It is a satisfying scene, but the famous name-bearing stone belongs to later lore, not to secure evidence.

What is better documented is less theatrical. Beringer changed his mind soon after publication, and judicial proceedings began on 13 April 1726. The boys were interrogated in several hearings. One, Zänger, admitted participating in the fraud; surviving accounts implicate Roderique and Eckhart, who had accused Beringer of making the stones himself and tried to shift blame onto the younger brothers.

Even that conclusion is not as solid as the legend suggests. The complete findings of the court have not survived. Roderique only took up his Würzburg post in December 1725, after the first stones appeared, and may have been elsewhere when the earliest specimens were planted. A modern re-examination has therefore proposed that he may have been trying, clumsily and too late, to stop Beringer from publishing rather than masterminding the entire hoax. The University of Würzburg still describes the central question as open: prank, intrigue or something more complicated?

The uncertainty matters because it changes the story from a fable about one gullible man into a study of how evidence is made. Beringer was wrong about the stones, but the people around him were not neutral observers. Some deceived him. Some tried to warn him. Some may have had reasons to let the spectacle continue. The object was false, yet the testimony surrounding it was mixed rather than uniformly fraudulent.

A mistake with a long afterlife

The stones did not vanish when the hoax was exposed. Some survive in collections. The book survived too, including a 1767 issue assembled from sheets of the original publication. Beringer’s error became a specimen in the history of palaeontology: not a fossil of an animal, but a fossil of a science learning what fossils were.

That is why the episode is more useful than the usual moral about gullibility. Beringer lived at a moment when geology had not yet acquired the rules that later seem obvious: that a claim should fit the material, that extraordinary forms need independent confirmation, that a specimen’s chain of custody matters. He was not foolish to ask what the stones meant. He was working before the discipline had agreed on what counted as an answer.

But the hoax also shows the danger of a theory that can absorb every objection. The knife marks became evidence of an unusual natural process. The warnings became jealousy. The impossible images became proof that ordinary explanations were inadequate. Once a stone had been given a role in the argument, looking at it plainly was no longer enough.

A carved stone can outlive the person who believed in it. Beringer’s book still lets us see the creatures that never lived, but it also records the moment when a false object became true history: not because the stone was natural, but because the mistake exposed the machinery by which nature is supposed to be known.