June 28, 2011 navbarDiscovery ChannelTLCAnimal PlanetMilitary ChannelDiscovery Health ChannelDiscovery Store
Discovery Channel rule
discovery storediscovery adventures
Discovery Channel
free newsletter
site search

send to a friend
printer friendly version

260-Million-Year-Old Leaf
260-Million-Year-Old Leaf

Antarctic Forests Reveal Ancient Trees
small text
large text

Nov. 5, 2004 — A quarter-billion years ago, forested islands flashed with autumnal hues near the South Pole — a polar scene unlike any today, researchers say.

Geologists have discovered in Antarctica the remains of three ancient deciduous forests complete with fossils of fallen leafs scattered around the tree trunks. The clusters of petrified tree stumps were found upright in the original living positions they held during the Permian period.


Prehistoric Tree Bark
Prehistoric Tree Bark

Tree Rings
Tree Rings

Fossil Stump
Fossil Stump

“ These were not scrubby little things. ”

Some stumps were even poking up through the snowfield in the Beardmore Glacier area, said geologist Molly Miller of Vanderbilt University.

"These were not scrubby little things," Miller said. "These were big trees."

Some are estimated to have attained heights of 80 feet (24.6 meters), based on their trunk diameter.

Miller, Tim Cully and graduate student Nichole Knepprath came upon the three stands of the lost forests in December 2003. Knepprath will be presenting their discovery on Sunday at the meeting of the Geological Society of America in Denver.

Unlike any trees today, the long-extinct Glossopteris trees lived in stands as thick as almost a thousand per acre just 20 or 25 degrees from the South Pole, a latitude at which they received no sunlight for half the year.

As for what they looked like, Glossopteris tapered upwards like a Christmas tree. Instead of needles, they had large, broad lance-shaped leaves that fell to the ground at the end of summer. It's unknown if the leaves turned colors, said Miller, but it seems likely.

"These are early, early deciduous trees," said Miller.

They lived at a time when the Antarctic climate was much warmer — although the trees still had to survive an extreme light regime of low sunlight half the year and darkness the other half.

"We don't have any modern analogues to these polar forests," said paleobotanist David Cantrill, curator at the Swedish Museum of Natural History in Stockholm.

The fossilized tree rings in the Glossopteris trees reveal that they grew steadily each summer and abruptly stopped for winter, as if a switch had been thrown.

"They probably reacted to light (rather than temperature) to switch off," said Cantrill.

Modern deciduous trees slow down and then stop growing when cold weather moves in.

Although fossil trees from the Permian have been found before in Antarctica, this is the first time whole stands of trees have been discovered, said Cantrill. With stands, researchers can now measure the spacing and calculate sizes of the trees to glean information about how much sunlight and energy was available — valuable and rare clues to the Permian climate.

Get More Current News:
Mozart's Family Exhumed
Hubble Sees Rare Triple Jupiter Eclipse
Eco-Friendly Disc Stores Data on Corn
Surfboard Zaps Sharks with Electricity
Ancient Roman Cream Used for Beauty


Pictures: Courtesy of Molly Miller |
Contributors: Larry O'Hanlon |


Discovery Channel | TLC | Animal Planet | Discovery Health | Science Channel | Planet Green
Discovery Kids | Military Channel | Discovery News | Investigation Discovery | HD Theater | Turbo | FitTV

HowStuffWorks | TreeHugger | Petfinder | PetVideo | Discovery Education

Visit the Discovery Store: Toys & Games | Telescopes | DVD Sets | Planet Earth DVD | Gift Ideas

By visiting this site, you agree to the terms and conditions
of our Visitor Agreement. Please read. Privacy Policy.
ATTENTION! We recently updated our privacy policy. The changes are effective as of September 10, 2008.
To see the new policy, click here. Questions? See the policy for the contact information.

Copyright © 2011 Discovery Communications, LLC.

The leading global real-world media and entertainment company.

May We Suggest

Sponsored Links