September 18, 2019- updated 09/17/2026
In the 1930s, a remarkable object was discovered near London, Texas. Max Hahn and his family found a rocklike nodule with a piece of wood protruding from it. When the nodule was later broken open, an iron hammerhead was revealed inside. The object has since become known as the London Hammer or London Artifact. The hammer itself appears to be relatively recent and man-made, probably no more than a few hundred years old. Yet part of the hammer and its wooden handle had become encased within a hard, stone-like mineral concretion. At first glance, the object appears astonishing. How could a relatively modern hammer become enclosed in solid rock?
An Important Qualification
The London Hammer is sometimes described as having been discovered inside Ordovician rock supposedly hundreds of millions of years old. However, the historical evidence does not clearly establish this. According to accounts of the discovery, the hammer-bearing nodule was found loose on a rock ledge beside a creek, rather than being excavated from intact bedrock. Therefore, we cannot legitimately claim that the hammer itself was originally deposited within Ordovician, or even Cretaceous, strata. However, the hammer still raises an interesting question about something we can actually observe:
How long does it take mineral material to harden around an object and become rocklike?
Rocklike Concretions Can Form Rapidly
The conventional explanation for the London Hammer is that mineral-rich water deposited dissolved minerals around a relatively recent hammer. Over time, those minerals hardened into a concretion surrounding portions of the hammer and its wooden handle.
If that explanation is correct, something important follows:
The hardened mineral material surrounding the hammer did not require millions or even thousands of years to form.
The age assigned to the surrounding geological formations therefore cannot simply be transferred to the concretion surrounding the hammer. Ancient minerals can be dissolved, transported, redeposited, and cemented around a much younger object. This is precisely why the London Hammer should not be presented as proof that humans were manufacturing iron tools hundreds of millions of years ago. But neither should it be dismissed as uninteresting.
The artifact provides a striking visual demonstration that mineral deposition, cementation, and the formation of rocklike concretions can occur around historically recent objects.
Observation Versus Interpretation
This distinction is especially important when discussing fossils and geological formations.
We can observe:
(1) The hammer.
(2) The mineral material surrounding it.
(3) That the hammer was manufactured by humans.
(4) That rock hard mineral material formed around recently human made object.
What the London Hammer does not tell us by itself is the age of the entire geological column or the age of the Earth. Those are much larger questions requiring additional evidence. For creationists, however, the London Hammer provides a useful reminder not to automatically equate “hardened into rock” with “required millions of years.”
The observable evidence demonstrates something considerably simpler and important:
Under suitable conditions, mineral-rich water can surround a recent object with material that hardens into a rocklike concretion. But what does this say about all the fossils that formed by similar or identical means?
Whatever conclusions one ultimately reaches about the age of the Earth, the London Hammer is a fascinating example of why the rate of a geological process should be demonstrated rather than merely assumed.
What Does the London Hammer Actually Demonstrate?
Of course, the London Hammer does not prove that humans were making iron tools 400 million years ago. The hammer-bearing concretion was not documented in place within rock of that age. What it does demonstrate is far simpler and directly observable: a historically recent human artifact became encased within hard, rocklike mineral material. Whatever one’s view of the age of the Earth, the London Hammer provides a fascinating example that mineral cementation around an object does not necessarily require thousands or millions of years. This is obvious with a miners hammer but what about all those fossils found under similar circumstances?
Fossils Can Form Surprisingly Quickly
The London Hammer is not the only example demonstrating that hard mineral material can form rapidly around buried objects. Fossils are frequently discovered inside concretions, hardened masses produced when dissolved minerals precipitate and cement sediment around an object or organism. Some fossil-bearing concretions preserve organisms in remarkable detail, including delicate soft tissues.
Some of the strongest examples:
- Shrimp, experimentally fossilized — Briggs and Kear placed modern shrimp under controlled decay conditions. Calcium-phosphate mineralization of muscle tissue began within two weeks and increased over the next 4–8 weeks. Microscopic cellular detail was preserved. This is particularly useful because the timescale was directly observed rather than inferred.
- Tusk-shell fossils in carbonate concretions — Researchers studied fossil Fissidentalium tusk shells surrounded by carbonate concretions and concluded that the concretions began forming within weeks to months after the animals died, driven by products released as their soft tissues decayed.
- Mazon Creek fossils, Illinois — This is probably the most spectacular natural example for your article. These iron-carbonate concretions contain fish, jellyfish-like animals, worms, crustaceans, insects, plants, ferns and the famous Tully monster (Tullimonstrum). Researchers conclude that the organisms were rapidly encapsulated during early decay, before the surrounding sediment had compacted.
- Mazon Creek plants — Ferns and other plant material were enclosed so early that their three-dimensional surface features were preserved before sediment compression could flatten them. Researchers specifically describe the cementation as occurring while the sediment was still soft.
- Modern shrimp mineralized on clay — A more recent experimental study found newly formed aluminosilicate minerals coating shrimp shortly after death. The mineral coating stabilized anatomical features sufficiently that the carcasses could retain external morphology for weeks, even without being buried.
Source: Briggs DE, Kear AJ. Fossilization of soft tissue in the laboratory. Science. 1993 Mar 5;259(5100):1439-42. doi: 10.1126/science.259.5100.1439. PMID: 17801278
Experimental and field research has demonstrated that important fossilization processes can begin remarkably quickly. Modern shrimp have undergone tissue mineralization within two weeks, while carbonate concretions surrounding fossil organisms have been estimated to form within weeks or months.
Interestingly, modern research has demonstrated that this process does not necessarily require millions of years. Studies of carbonate concretions indicate that some can form within months or years, while even very large concretions may develop within decades under suitable conditions.
Laboratory experiments have demonstrated an even more striking phenomenon. Researchers studying the fossilization of modern shrimp observed mineralization preserving cellular details beginning within only two weeks.
This does not establish the age of the geological formations in which ancient fossils are found. It does, however, establish an important distinction:
The process that turns buried remains into a mineralized fossil, or surrounds them with hardened mineral cement, does not necessarily require millions of years.
Rapid burial, particular chemical conditions, mineral-rich water, and restricted decay can initiate remarkable preservation surprisingly quickly.
Thus, when examining the fossil record, we should distinguish between two very different questions:
How long did fossilization take? and How long ago did fossilization occur? They are not the same question.
Sources
- Creation Evidence Museum, “The London Artifact.”
https://www.creationevidence.org/displays/london_artifact.php - J. R. Cole, “If I Had a Hammer,” Creation/Evolution, Vol. 5, No. 1, 1985. National Center for Science Education.
https://ncse.ngo/if-i-had-hammer - Glen J. Kuban, “The London Hammer: An Alleged Out-of-Place Artifact.”
https://www.paleo.cc/paluxy/hammer.htm
