Answer:
252 million to 65 million years ago.
Step-by-step explanation:
Ceratites and ammonites are both types of extinct marine mollusks that belong to the same group called ammonoids. They are characterized by their spiral-shaped shells.
During the Triassic period, which lasted from about 252 million to 201 million years ago, ceratites were particularly diverse and widespread. They continued to thrive during the Jurassic period, which lasted from about 201 million to 145 million years ago.
Ammonites, on the other hand, have a longer fossil record, with their existence dating back to the Devonian period, around 416 million years ago. They were most abundant during the Mesozoic era, which includes the Triassic, Jurassic, and Cretaceous periods.
The Cretaceous period, which lasted from about 145 million to 65 million years ago, saw the peak diversity and abundance of ammonites. However, towards the end of the Cretaceous, around 65 million years ago, a mass extinction event occurred, leading to the extinction of most ammonites and many other species.
In summary, the estimated age range for both ceratites and ammonites covers a span of geological periods, providing valuable information about the ancient marine environments and the evolution of ammonoids.