Featured Research

from universities, journals, and other organizations

Earth Under Global Cooling

Date:
April 9, 2009
Source:
The Geological Society of America
Summary:
Thirty-four-million years ago, Earth changed profoundly. What happened, and how were Earth's animals, plants, oceans, and climate affected? Focusing on the end of the Eocene epoch and the Eocene-Oligocene transition was a critical but very brief interval in Earth's history.

Thirty-four-million years ago, Earth changed profoundly. What happened, and how were Earth's animals, plants, oceans, and climate affected? Focusing on the end of the Eocene epoch and the Eocene-Oligocene transition, a critical but very brief interval in Earth's history, GSA's latest Special Paper provides new answers to these questions.

According to the book's editors, Christian Koeberl of the University of Vienna and Alessandro Montanari of the Observatorio Geologico di Coldigioco in Italy, the end of the Eocene and the Eocene-Oligocene (E-O) transition mark the most profound oceanographic and climatic changes of the past 50 million years of Earth's history.

Earth experienced global cooling beginning in the middle Eocene, with a sharp temperature drop of about two degrees Celsius in the Late Eocene. This drop was characterized by an increase in marine oxygen isotope values and significant floral and faunal turnovers. The global climate changes are commonly attributed to the expansion of the Antarctic ice cap following its gradual isolation from other continental masses. However, as examined in this volume, multiple extraterrestrial bolide impacts, possibly related to a comet shower that lasted more than two million years, may have played an important role in deteriorating the global climate.

The volume provides an excellent overview of conditions on Earth during the last few million years of the Eocene and around the time of the Eocene-Oligocene boundary. Chapters include an expanded look at Earth across time by Walter Alvarez and colleagues; an updated and enhanced understanding of the Eocene-Oligocene boundary transition using different climate proxies, improved time control, and climate models; integrated stratigraphy of the late Eocene-early Oligocene transition and reevaluation of the Global Stratotype Section and Point (GSSP); paleoecology and paleoclimate through the critical period of transition from hothouse to icehouse; and Late Eocene impact processes and impact stratigraphy.


Story Source:

The above story is based on materials provided by The Geological Society of America. Note: Materials may be edited for content and length.


Cite This Page:

The Geological Society of America. "Earth Under Global Cooling." ScienceDaily. ScienceDaily, 9 April 2009. <www.sciencedaily.com/releases/2009/04/090409104134.htm>.
The Geological Society of America. (2009, April 9). Earth Under Global Cooling. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2009/04/090409104134.htm
The Geological Society of America. "Earth Under Global Cooling." ScienceDaily. www.sciencedaily.com/releases/2009/04/090409104134.htm (accessed September 22, 2014).

Share This



More Earth & Climate News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Will Climate Rallies Spur Change?

Will Climate Rallies Spur Change?

Newsy (Sep. 21, 2014) Organizers of the People's Climate March and other rallies taking place in 166 countries hope to move U.N. officials to action ahead of their summit. Video provided by Newsy
Powered by NewsLook.com
Thousands March in NYC Over Climate Change

Thousands March in NYC Over Climate Change

AP (Sep. 21, 2014) Accompanied by drumbeats, wearing costumes and carrying signs, thousands of demonstrators filled the streets of Manhattan and other cities around the world on Sunday to urge policy makers to take action on climate change. (Sept. 21) Video provided by AP
Powered by NewsLook.com
Climate Change Rally Held in India Ahead of UN Summit

Climate Change Rally Held in India Ahead of UN Summit

AFP (Sep. 20, 2014) Some 125 world leaders are expected to commit to action on climate change at a UN summit Tuesday called to inject momentum in struggling efforts to tackle global warming. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
New Music With Recycled Instruments at Colombia Fest

New Music With Recycled Instruments at Colombia Fest

AFP (Sep. 19, 2014) Jars, bottles, caps and even a pizza box, recovered from the trash, were the elements used by four musical groups at the "RSFEST2014 Sonorities Recycling Festival", in Colombian city of Cali. Duration: 00:49 Video provided by AFP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins