Geologic Time Scale: Cretaceous Period

The Cretaceous Period

Maastrichtian Age/Stage

Late Cretaceous: 72.1 to 66.0 million years ago

The Maastrichtian was the last stage, age, or epoch of the late or upper Cretaceous period. The Maastrichtian was first identified in 1849 by Belgian geologist Andre Hubert Dumont. The name derived from studying rock strata (layers) from the Chalk Group near the Dutch town of Maastricht. was formally named the Maastricht Formation by Dumont. The Masstrichtian ends with the Cretaceous-Paleogene extinction event.

Campanian Age/Stage

Late Cretaceous: 83.6 to 72.1 million years ago

The Campanian Epoch is the second to last age in the Late Cretaceous Period. The time is known for high dinosaur diversity and rising sea levels all around the world. The most well know of these seas was the North American western interior seaway. In 1857 Henri Coquand named the Campainian after the western French village of Champagne.

Santonian Age/Stage

Late Cretaceous: 86.3 to 83.6 million years ago

The Santonian Epoch was named in 1857 by French geologist Henri Copuand after the city of Saintes.

Coniacian Age/Stage

Late Cretaceous: 89.8 to 83.6 million years ago

The Coniacian Epoch was named in 1857 by French geologist Henri Coquand after the city of Cognac in the French region of Saintonge.

Turonian Age/Stage

Late Cretaceous: 93.9 to 89.8 million years ago

The Turonian Epoch was named in 1842 by French paleontologist Alcide d’Orbigny, after the French city of Tours in a region of Touraine.

Cenomanian Age/Stage

Late Cretaceous: 100.5 to 93.9 million years ago

The Cenomanian Epoch is the first stage of the late or upper Cretaceous Period.¬† The Cenomanian was named in 1847 by French paleontologist Alcide d’Orbigny after the French city of Le Mans Cenomanum.

Albian Age/Stage

Early Cretaceous: 113.0 to 100.5 million years ago

The Albian Epoch is the final stage of the early or lower Cretaceous Period. The name was first purposed in 1842 by Alcide d’Orbigny after Alba, the Latin name for the River Aube in France.

Aptian Age/Stage

Early Cretaceous: 121.4 to 113.0 million years ago

The Aptian Epoch was named in 1840 by Alcide d’Orbigny after a small city Apt in the Provence region of southeatern France.

Barremian Age/Stage

Early Cretaceous: 129.4 to 121.4 million years ago

The Berrmian Epoch was named in 1873 by Henri Coquand after the village of Berreme, Alpes-de-Haute-Provence in France.

Hauterivian Age/Stage

Early Cretaceous: 132.6 to 129.4 million years ago

The Hauterivian Epoch was named by Swiss geologist Eugene Renevier in 1873 after the lake (Neuchatel) side Swiss town of Hauterive.

Valanginian Age/Stage

Early Cretaceous: 139.8 to 132.2 million years ago

The Valanginian Epoch was first named in 1853 by Edouard Desor after the Valangin, a small town north of Neuchatel in the Jura Mountains of Switzerland. THe oldest angiospermae (flowering plants) cant be dated back to the late Valanginian.

Berriasian Age/Stage

Early Cretaceous: 145.0 to 139.8 million years ago

The Berriasian Epoch was the first stage of the Cretaceous Period and marks the end of the Jurassic. It was named in 1869 by Henri Coquand after the village of Berrias in the Ardeche department in France.

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