On the edge of the Sahara, in southeastern Morocco, a long line of eroding cliffs hides one of the most remarkable fossil records on Earth. The Kem Kem beds preserve a lost river world from the middle of the Cretaceous, packed with giant predators, huge fish and flying reptiles. For collectors, Kem Kem dinosaur fossils offer a direct connection to this extraordinary ecosystem.
Here is what makes the Kem Kem so special, what lived there and what it means for anyone collecting its fossils.
Where are the Kem Kem beds?
The Kem Kem beds run for roughly 250 kilometres along Morocco’s border with Algeria, forming an escarpment that rises above the desert plain. The fossil-producing areas lie near towns such as Erfoud, Taouz and Begaa, which have become centres for fossil digging and preparation.
Geologists now call this sequence the Kem Kem Group. It is made of two main units: the lower Gara Sbaa Formation and the upper Douira Formation. Most dinosaur fossils come from river sandstones in these layers.
How old is the Kem Kem?
The Kem Kem rocks date to the Cenomanian stage of the Late Cretaceous, roughly 100 to 95 million years ago. That makes them about 30 million years older than the famous Hell Creek Formation of North America, where Tyrannosaurus rex lived.
At the time, North Africa looked nothing like today’s desert. A vast network of rivers flowed north across a lush lowland toward the sea.
A world ruled by predators
The Kem Kem is famous for something unusual: its fossil record is dominated by meat-eaters. In most ancient ecosystems, plant-eaters far outnumber predators. In the Kem Kem, teeth and bones of large carnivores are found far more often than those of herbivores.
Scientists have nicknamed this puzzle “Stromer’s riddle”, after the German paleontologist Ernst Stromer, who first described similar predator-rich faunas from Egypt. Part of the answer is probably the river setting. Abundant fish could support several large predators at once, and the river sands may have favoured the preservation of tough, shed teeth.
The giants of the Kem Kem
The best-known Kem Kem dinosaurs are its predators.
- Spinosaurus, a long-snouted, sail-backed hunter adapted for life around water, with cone-shaped teeth for catching fish. Explore Spinosaurus fossils.
- Carcharodontosaurus, one of the largest meat-eating dinosaurs ever found, with blade-like, serrated teeth. See Carcharodontosaurus teeth.
- Deltadromeus, a slender, long-legged theropod.
- Abelisaurids and dromaeosaurids, smaller predators with sharp serrated teeth, found in the Moroccan raptor and abelisaur category.
Plant-eaters are rarer but present. The sauropod Rebbachisaurus is known from the Kem Kem, and its teeth and bones occasionally reach collectors.
More than dinosaurs
The Kem Kem rivers supported a whole community of animals.
Giant fish. The coelacanth Mawsonia grew to several metres long, and Onchopristis, a sawfish-like fish, carried a long snout lined with barbed teeth. Lungfish were also common.
Crocodile relatives. Several types lived along the rivers, from long-snouted fish-eaters to smaller land-dwelling forms.
Pterosaurs. Flying reptiles such as Alanqa and Siroccopteryx hunted over the water. Their teeth and jaw fragments are among the most sought-after Kem Kem fossils.
Turtles. Shell fragments and bones round out the ecosystem.
Many of these animals appear alongside dinosaurs in the pterosaurs, sauropods and crocodiles category.
How Kem Kem fossils are found
Most Kem Kem fossils are found by local diggers who work the escarpment by hand. They often follow fossil-bearing layers by digging tunnels into the hillside, sometimes many metres deep. Teeth and bones are sorted, cleaned and prepared before being sold to dealers.
This system has made Kem Kem teeth widely available, but it also means locality data is usually general. A specimen is typically labelled “Kem Kem beds, Morocco” rather than with an exact site.
Collecting Kem Kem fossils wisely
Kem Kem fossils are genuine treasures, but the trade has its challenges.
Check carefully for restoration, especially rebuilt tips and filled cracks. Watch for composites, where teeth or bones are assembled from more than one specimen. Make sure identifications are sensible: crocodilian teeth are sometimes sold as Spinosaurus, and generic theropod teeth as Carcharodontosaurus.
A good dealer identifies specimens carefully, discloses repairs and stands behind every piece. Buried Treasure Fossils has been selling fossils online since 2000 and guarantees the authenticity of its specimens. Learn more on the About Us page.
Frequently asked questions
1. What are the Kem Kem beds?
They are a sequence of mid-Cretaceous river rocks in southeastern Morocco, famous for fossils of large predatory dinosaurs, fish, crocodilians and pterosaurs.
2. How old are Kem Kem fossils?
About 100 to 95 million years old, from the Cenomanian stage of the Late Cretaceous.
3. What dinosaurs lived in the Kem Kem?
Spinosaurus, Carcharodontosaurus, Deltadromeus, abelisaurids, dromaeosaurids and the sauropod Rebbachisaurus, among others.
4. Why does the Kem Kem have so many predator fossils?
Scientists think the rich river ecosystem supported several large predators, and the river setting may have favoured the preservation of their teeth.
Own a piece of Africa’s lost river world
The Kem Kem beds offer a rare window into a time when giant predators ruled North Africa’s rivers. A single tooth can tell that story on your shelf. Explore authentic Kem Kem dinosaur fossils at Buried Treasure Fossils.