Cenozoic Life

Cenozoic Life - Cenozoic Life Cenozoic EVIDENCE FOR...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
4/22/11 1 Cenozoic Life Cenozoic EVIDENCE FOR CENOZOIC CLIMATE CHANGE… • Remember in the Cretaceous, climates were much warmer than today. • Although the oceans and atmosphere are affected by the K/T boundary the climate soon returned to its greenhouse state in the Paleocene. • Eocene rocks show fossils of palms and cycads at 60°N, alligators lived at 77°N. • Beginning of the Eocene was marked by a major warming event. • Why? Change in oceanic circulation. • The Late Eocene and Oligocene the earth climate had dropped >10°C. • Earth went from hothouse ocean to icebox ocean. Close to home! Calvert Cliffs
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 • 35-40myr the earth began to experience a steady temperature decline until a critical threshold has reached and ice caps began to form and grow. • Glaciation began on both poles in the middle Cenozoic. • Oligocene and Miocene fossils suggests cooling temperatures. • IRD was first found in the Cenozoic from Miocene aged sediments. • The Arctic ocean has been mainly ice covered for the past 15myr. Plankton O-18 evidence for cooling Benthic foraminifera Nummulitid foraminifera
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/23/2012 for the course GEOL 102 taught by Professor Kysar during the Spring '06 term at George Mason.

Page1 / 11

Cenozoic Life - Cenozoic Life Cenozoic EVIDENCE FOR...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online