Geological Time Period
| Detail | Information |
|---|---|
| Era | Mesozoic Era |
| Period | Early Cretaceous |
| Age | Aptian to Albian stages |
| Time | ~115–105 million years ago |
| Formation | Elrhaz Formation, Gadoufaoua, Niger |
What Was West Africa Like 110 Million Years Ago?
The region now known as the Sahara Desert was a dramatically different environment during the Early Cretaceous. Instead of sand and rock, it was a lush, tropical floodplain environment — an ancient river delta system with dense vegetation, rivers, lakes, and a warm, humid climate similar to parts of modern-day South America or Southeast Asia.
The landscape was dominated by low-growing ferns, horsetails, cycads, and early flowering plants. Rivers and floodplains created ideal grazing conditions for large herbivores like Nigersaurus.
Prehistoric Neighbors
Nigersaurus did not live alone. The Elrhaz Formation where it was found contains evidence of a rich and diverse prehistoric ecosystem. Its contemporaries included:
- Sarcosuchus imperator — a massive prehistoric crocodilian over 30 feet long, nicknamed "SuperCroc," discovered by the same team
- Suchomimus — a large fish-eating spinosaurid dinosaur found in the same region
- Ouranosaurus — a large duck-billed iguanodontid herbivore with a distinctive sail on its back
- Lurdusaurus — another large herbivorous dinosaur from the same formation
- Various pterosaurs, fish, turtles, and other prehistoric creatures
When Did It Go Extinct?
The exact extinction timeline for Nigersaurus is not precisely known. The species appears in the fossil record from approximately 115 million years ago and the known specimens date to around 105 million years ago. Like many dinosaur species, it likely disappeared due to gradual environmental or ecological changes rather than a single event. The mass extinction that ended the dinosaurs occurred much later — approximately 66 million years ago.
How Was It Discovered?
Nigersaurus fossils were first collected in the 1960s and 1970s by French paleontologists working in Niger. The species was formally named in 1976 based on fragmentary material. However, the landmark discovery came in 1997 when paleontologist Paul Sereno led an expedition to the Gadoufaoua region and recovered a far more complete specimen — including the distinctive skull that revealed the extraordinary tooth arrangement. The species was formally redescribed and its 500+ teeth became widely known following Sereno's 1999 publication.