Aachenosaurus Facts
Note: Although historically classified as a dinosaur, Aachenosaurus is no longer considered one based on current scientific understanding. It remains a fascinating prehistoric creature.
Pronunciation: AH-ken-oh-SORE-us
Name meaning: Aachen Lizard
| Diet | Herbivore |
| Environment | Land |
| Era | Cretaceous |
| Period | Late Cretaceous |
| Type | Other |
| Location | Germany |
Although once classified as a dinosaur, Aachenosaurus is now known to be fossilised wood rather than an animal at all. This remarkable case of mistaken identity represents one of palaeontology's most famous blunders, highlighting how fragmentary fossils can sometimes fool even experienced scientists.
In 1888, Belgian geologist Gerard Smets discovered what he believed to be dinosaur bones in Late Cretaceous rock formations near Aachen, Germany. The fossil fragments appeared to show the structure of vertebrae and other skeletal elements, leading Smets to describe them as belonging to a new dinosaur species. He named it Aachenosaurus multidens, meaning 'Aachen lizard with many teeth', based on what he interpreted as dental features.
However, further examination by other scientists revealed that these 'bones' were actually pieces of petrified wood from an ancient conifer tree. The regular, segmented structure that Smets had mistaken for vertebrae was simply the natural grain and growth rings of fossilised timber. What had appeared to be tooth-like projections were merely the preserved texture of bark or wood fibres.
This discovery became a cautionary tale in palaeontology, demonstrating the importance of thorough analysis and peer review when describing new species. Today, Aachenosaurus serves as a reminder that even the most experienced fossil hunters can be deceived by the tricks that time and fossilisation can play on organic remains.
What made Aachenosaurus distinctive?
The fossils showed regular, segmented structures that resembled vertebrae, along with what appeared to be tooth-like projections. These features were later identified as the natural grain patterns and bark textures of fossilised conifer wood.
Behaviour
As fossilised wood rather than an animal, Aachenosaurus had no behaviour. The original conifer tree would have grown in Late Cretaceous forests, likely reaching considerable height in the warm, humid climate of the period.
Aachenosaurus FAQ
What did Aachenosaurus eat?
Aachenosaurus didn't eat anything because it wasn't actually an animal - it was fossilised wood from an ancient conifer tree. The original tree would have photosynthesised like modern conifers.
How big was Aachenosaurus?
Since Aachenosaurus was fossilised wood rather than a dinosaur, there are no meaningful size measurements. The wood fragments found were relatively small pieces of what was once a much larger tree.
When did Aachenosaurus live?
The fossilised wood that became known as Aachenosaurus came from a conifer tree that lived during the
Late Cretaceous period, roughly 100 to 66 million years ago.
Where was Aachenosaurus found?
The Aachenosaurus fossils were discovered near Aachen in western Germany, close to the borders with Belgium and the Netherlands, in
Late Cretaceous rock formations.
How do you pronounce Aachenosaurus?
Aachenosaurus is pronounced 'AH-ken-oh-SORE-us', with emphasis on the first and third syllables. The name comes from Aachen, the German city near where it was found.
What does Aachenosaurus mean?
Aachenosaurus means 'Aachen lizard', named after the German city of Aachen where the fossils were discovered. The species name 'multidens' means 'many teeth', referring to what were mistakenly thought to be dental features.
How fast could Aachenosaurus run?
Aachenosaurus couldn't run at all because it wasn't an animal - it was fossilised wood from an ancient tree. Trees, of course, are rooted in place and don't move.
What type of dinosaur was Aachenosaurus?
Aachenosaurus wasn't actually a dinosaur at all. Although originally described as a dinosaur in 1888, it was later discovered to be fossilised wood from a conifer tree, making it one of palaeontology's most famous cases of mistaken identity.
Was Aachenosaurus related to birds?
Since Aachenosaurus was fossilised plant material rather than an animal, it has no relationship to birds or any other animals. As a conifer tree, it would be more closely related to modern pine, fir, and spruce trees.
How many Aachenosaurus fossils have been found?
Only the original fragments discovered by Gerard Smets in 1888 are known. Once these were identified as fossilised wood rather than dinosaur bones, no further specimens were actively sought or described under this name.
