Skip to main content
CNN.com
Search
Home World U.S. Weather Business Sports Analysis Politics Law Tech Science Health Entertainment Offbeat Travel Education Specials Autos I-Reports
Science and Space News

Scientist: Oldest tree had fronds, not leaves

Adjust font size:
Decrease fontDecrease font
Enlarge fontEnlarge font

CHICAGO, Illinois (Reuters) -- The branches of Earth's oldest tree probably waved in the breeze like a modern palm, scientists said on Wednesday, based on two intact tree fossils that help explain the evolution of forests and their influence on climate.

The 385-million-year-old fossils, which scientists believe are evidence of Earth's earliest forest trees, put to rest speculation about fossilized tree stumps discovered more than a century ago in Gilboa, New York.

Scientists believe these early forests absorbed carbon dioxide, cooling the Earth's surface.

The forests were flourishing at an important juncture in the history of life of Earth, coming shortly before the appearance of the first vertebrates -- four-legged amphibians -- that could live on dry land.

"We've solved this long-standing puzzle," said Linda VanAller Hernick, a paleontologist at the New York State Museum, who wrote about her discovery in the journal Nature.

The stumps in Gilboa were unearthed in 1870 when workers were blasting a quarry. Until now, scientists had never seen the tops of those trees.

Hernick and museum colleague Frank Mannolini discovered an intact crown and part of a tree trunk in 2004 and a year later found a 28-foot trunk portion of the same species.

Pieced together, they represent Wattieza, a tree that looked like modern-day palm with a crown of fronds that grew up to 30 feet high and reproduced through spores.

"Previously, paleobotanists thought that a tree called Archaeopteris was the oldest tree. Now we know there were tree-like plants in abundance much earlier," Hernick said in a telephone interview.

The fern-like trees are about 23 million years older than Archaeopteris, which Hernick said resembled a modern tree, with conventional branches.

Instead of leaves, the Wattieza had frond-like branches with branchlets that resembled a bottlebrush, said William Stein, a paleobiologist at Binghamton University in Binghamton, New York, and co-author of the study.

The tree branches fell to the forest floor, providing a potential food source and shelter for living creatures, the researchers said.

"This is a spectacular find which has allowed us to recreate these early forest ecosystems," said British researcher Christopher Berry of Cardiff University, who worked on the study.

Berry said the branches would have decayed, providing a new food chain for the bugs living below.

"The rise of the forests removed a lot of carbon dioxide from the atmosphere. This caused temperatures to drop and the planet became very similar to its present day condition," he said in a statement.

For Hernick, who was inspired to become a paleontologist after viewing the Gilboa stumps as a child, the discovery offers a fair bit of personal satisfaction.

"It's kind of nice to bring this story to a close," she said.

Copyright 2007 Reuters. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed.

Follow Related Topics

Search TopicE-mail Alerts

Advertisement

Advertisement

Career Builder.com
Quick Job Search
  More Options
International Edition
CNN TV CNN International Headline News Transcripts Advertise with Us About Us Contact Us
Search
© 2007 Cable News Network.
A Time Warner Company. All Rights Reserved.
Terms under which this service is provided to you.
Read our privacy guidelines. Contact us. Site Map.
SERVICES » E-mails RSSRSS Feed PodcastsRadio News Icon CNNtoGo CNN Pipeline
Offsite Icon External sites open in new window; not endorsed by CNN.com
Pipeline Icon Pay service with live and archived video. Learn more