Ejinhoro Formation, Geological formation in Inner Mongolia, China.
The Ejinhoro Formation is a geological sequence in the Ordos Basin made up of alternating layers of sandstone, mudstone, and siltstone. These deposits formed during the Early Cretaceous period and shape the landscape of this region in Inner Mongolia today.
The formation was laid down during the Early Cretaceous period roughly 140 to 100 million years ago and preserves fossils of several dinosaur species including Wuerhosaurus and Psittacosaurus. Paleontologists recognized these layers as a key record for understanding that time.
Research teams from international institutions conduct regular expeditions to study the geological composition and extract fossil specimens for scientific analysis.
Access to the site requires preparation since it is located in a remote area. Visitors should check on seasonal conditions as weather can affect how easy it is to reach the location.
An unusual find among the many dinosaur fossils is a single preserved jawbone from the mammal Hangjinia. This rare evidence shows that small mammals lived alongside the large reptiles during dinosaur times.
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