“In the Uhaa Tolgod area, located in the Gobi desert, paleontologists stumbled upon a fossilized skeleton that has been preserved in incredibly good condition and measures only 1 centimeter in length,” notes MiddleAsianNews.
This fossil is believed to represent one of the earliest examples of “micromammals” from the late Cretaceous period.
According to a statement from the American Museum of Natural History (AMNH), which participated in the Mongolian-American Museum Expedition (MAME), the finding of a fully preserved skeleton of such size (comparable to a fingernail) is an extremely rare occurrence. Fossils are rarely found due to their fragility, unlike teeth, which are found much more frequently.
This discovery of a miniature skull and limbs offers scientists a unique insight into the biodiversity of the Mesozoic era, providing new data on how these tiny ancestors coexisted with giant creatures. This finding sheds light on the evolution of early mammals, demonstrating how their specialized skeletal adaptations allowed them to occupy ecological niches that were previously considered vacant.
The 1-centimeter fossil discovered in Mongolia represents a unique artifact preserved since the time of the dinosaurs.
The American Museum of Natural History reports that finding a fully preserved skeleton with intact soft tissues of such small size is an extremely rare event for the late Cretaceous period.
The Gobi desert is known for its large dinosaur finds, and now this late Cretaceous “micromammal” fossil is “one of very few” such specimens, as fossils of such fragile creatures typically disintegrate under the forces of nature over millions of years.
This unusual creature resembles a shrew and belongs to a group of advanced Mesozoic insectivorous ancestors of mammals that existed alongside the velociraptor.
How this fossil was preserved
The only reason such a fragile creature could survive to this day is due to a process known as “long-term desertification.”
Research shows that around 75–100 million years ago, intercontinental desertification occurred in the Gobi river basin, caused by the uplift of neighboring mountain ranges.
Remains of small animals caught in massive sandstorms were quickly buried under fine dry sand, which helped preserve them from decay and washing away, turning them into natural “time capsules” for nearly 100 million years.
Life in harsh climatic conditions
The fossil measuring only 1 centimeter indicates how organisms adapted to the extreme conditions of the Gobi desert with its sharp climate changes. As ecosystems dried up, insectivorous animals adapted and were able to survive in this region without access to fresh water.
The eastern part of the Gobi basin has been identified as one of the “intercontinental” regions experiencing significant changes due to climate change, which helps to understand how previous generations of mammals survived under conditions of extreme global warming, thanks to the found tiny fossil.
How is a 1-centimeter fossil studied?
Due to its tiny size, scientists cannot use traditional hammers, and chisels are unsuitable because of the fragility of the skeleton.
High-resolution micro-computed tomography is used to study these specimens, allowing researchers to see through the rock and create a digital 3D model of the 1-centimeter skeleton, preserving all details, including teeth and the inner ear. This enables thorough examination without damaging the original specimen.
