Question 1

How do you say Santonian?

Accepted Answer

Santonian is pronounced san-TOH-nee-an. You stress the second syllable, TOH, and the rest flows smoothly after it. Break it down like this: san, then TOH, then nee, then an. Say it a few times fast and it starts to sound very natural.

Question 2

What does Santonian mean?

Accepted Answer

Santonian is named after Saintes, a city in southwestern France. Saintes got its own name from the Santones, an ancient Celtic tribe who lived in that region thousands of years ago. So when geologists say Santonian, they are ultimately referencing a prehistoric human tribe through a French city to describe a prehistoric geological time period.

Question 3

When was the Santonian age?

Accepted Answer

The Santonian lasted from approximately 85.7 million years ago to 83.6 million years ago. That means it spanned about 2.1 million years in total. It falls within the Late Cretaceous period, which is the final chapter of the age of dinosaurs before the mass extinction 66 million years ago.

Question 4

What dinosaurs lived during the Santonian?

Accepted Answer

Several important dinosaur groups were thriving during the Santonian. Early tyrannosaurs were present in North America and Asia, though they were smaller than the later T. rex. Hadrosaurs, the duck-billed plant-eaters, were becoming very common. Ceratopsians with their horns and frills were rapidly diversifying. It was a rich and varied dinosaur world spread across multiple continents.

Question 5

What was Earth like during the Santonian?

Accepted Answer

Earth during the Santonian was extremely warm, with no polar ice caps at all. Sea levels were much higher than today, flooding large parts of the continents with shallow tropical seas. North America was actually split into two separate landmasses by a vast inland sea called the Western Interior Seaway. Flowering plants were spreading rapidly while dinosaurs dominated the land.

Question 6

Is the Santonian part of the Cretaceous?

Accepted Answer

Yes, the Santonian is a stage within the Late Cretaceous epoch. The Cretaceous itself lasted from about 145 million years ago to 66 million years ago. The Santonian sits near the middle of the Late Cretaceous, coming after the Coniacian and before the Campanian, which eventually leads into the final Maastrichtian stage that ended with the great extinction event.

Question 7

What sea animals lived during the Santonian?

Accepted Answer

The Santonian seas were incredibly dangerous and full of giant predators. Mosasaurs like Tylosaurus were the top predators, reaching lengths of over 12 meters. Long-necked plesiosaurs also cruised the warm waters. Giant sharks patrolled the depths alongside enormous bony fish. The Western Interior Seaway in North America was essentially a prehistoric ocean highway teeming with enormous marine reptiles.

Question 8

Why was sea level so high during the Santonian?

Accepted Answer

Sea levels were high during the Santonian mainly because there were no polar ice caps to lock water away on land. All that water stayed liquid in the oceans. Additionally, the ocean floor was being pushed up by intense volcanic activity at mid-ocean ridges, which displaced water outward and further raised sea levels. The combined effect was continental flooding on a massive scale.

Question 9

How long did the Santonian last?

Accepted Answer

The Santonian lasted approximately 2.1 million years, from about 85.7 to 83.6 million years ago. In geological terms that is actually quite short. For comparison, our own human genus Homo has existed for about 2.8 million years. The Santonian was a brief but eventful snapshot in the much longer story of the Cretaceous period.

Question 10

Who named the Santonian age?

Accepted Answer

French geologist Henri Coquand named the Santonian in 1857. He was studying distinctive fossil-bearing rock layers near the city of Saintes in France when he recognized that they represented a unique and definable slice of geological time. Coquand followed the long-established geological tradition of naming stages after the location where the defining rock layers are found.

Question 11

What came before and after the Santonian?

Accepted Answer

The Santonian was preceded by the Coniacian age, which ended around 85.7 million years ago. After the Santonian came the Campanian age, beginning around 83.6 million years ago. The Campanian was a longer and very important stage during which some of the most famous dinosaurs, including Triceratops ancestors and large tyrannosaurs, continued to evolve and diversify.

Question 12

Did humans exist during the Santonian?

Accepted Answer

Not at all. The Santonian ended about 83.6 million years ago, and the earliest members of the human genus did not appear until roughly 2.8 million years ago. That means the Santonian was over 80 million years before any human-like creature walked the Earth. Our earliest mammal relatives during the Santonian were small, likely nocturnal creatures that mostly stayed out of the way of dinosaurs.

Question 13

What plants grew during the Santonian?

Accepted Answer

The Santonian world had a rich mix of plant life. Conifer forests still covered vast areas, similar to some of the forests we see today but in a much warmer climate. Flowering plants, called angiosperms, had evolved relatively recently in geological terms and were spreading and diversifying rapidly during this time. Ferns, cycads, and horsetails also thrived, especially in wet and swampy areas near the great inland seas.

Santonian Pronunciation

What does Santonian mean?

Name Roots

Fun Facts

Learn More About Santonian

Related Time Periods