Who defined the Cretaceous period and when was it named?
Belgian geologist Jean d'Omalius d'Halloy first defined the Cretaceous period in 1822. He named it the Terrain Crétacé based on the extensive white chalk deposits found in the Paris Basin.
Common questions about Cretaceous
Short answers, pulled from the story.
When did the Cretaceous period last and how long was it?
The Cretaceous period lasted from approximately 143.1 million years ago until 66 million years ago. It was the longest period of the Mesozoic Era and the ninth longest geological period in the entire Phanerozoic Eon.
What caused the extreme warmth during the Mid-Cretaceous Hothouse?
Extreme warmth during the Mid-Cretaceous Hothouse was driven by rapid seafloor spreading and massive releases of carbon dioxide from volcanic activity. These volcanic events included the Paraná-Etendeka Large Igneous Province and the Deccan Traps.
When did flowering plants first appear and when did they become dominant?
The first evidence of flowering plants appears in the late Valanginian, around 134 million years ago. By the middle Cretaceous, these plants underwent a rapid radiation and became the dominant group of land plants by the end of the period.
What caused the Cretaceous, Paleogene extinction event?
The Cretaceous, Paleogene extinction event was caused by the impact of a large asteroid that formed the Chicxulub crater in the Gulf of Mexico. This impact created the K, Pg boundary, an iridium-rich layer found worldwide that marks the end of the Mesozoic Era.
Which animals survived the Cretaceous, Paleogene extinction event and why?
Omnivores, insectivores, and carrion-eaters survived the Cretaceous, Paleogene extinction event because they fed on detritus and dead matter. Crocodilians and champsosaurs were the largest air-breathing survivors due to their ability to live as scavengers and feed on invertebrates and dead organisms.