1 / 9

THE CRETACEOUS PERIOD

Occurrences. The breakup of super continent Pangaea continues, which led to increased regional variations among animals and plants. The climate was very warm. No ice existed in the poles, and sea levels were significantly higher. Surface temperatures were 9-12?C warmer than today. The temperature

mandar
Download Presentation

THE CRETACEOUS PERIOD

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. because of extensive beds of calcium carbonate from deposits of shells of marine invertebrates found in the Upper Cretaceous in Europe. The boundary that separates the Cretaceous from the Jurassic is the dating of the rock beds. The end of the Cretaceous period is marked by an iridium-rich layer found worldwide that is attributed to the Chicxulub impact crater in Mexico. because of extensive beds of calcium carbonate from deposits of shells of marine invertebrates found in the Upper Cretaceous in Europe. The boundary that separates the Cretaceous from the Jurassic is the dating of the rock beds. The end of the Cretaceous period is marked by an iridium-rich layer found worldwide that is attributed to the Chicxulub impact crater in Mexico.

    6. Separated into Pennsylvanian (upper) and Mississippian (lower) in the US to distinguish Pennsylvanian = coal, Miss = limestone Name comes from vast deposits of coal; period boundaries = defined by rock beds, but off by 5-10 millionSeparated into Pennsylvanian (upper) and Mississippian (lower) in the US to distinguish Pennsylvanian = coal, Miss = limestone Name comes from vast deposits of coal; period boundaries = defined by rock beds, but off by 5-10 million

More Related