Featured Research

from universities, journals, and other organizations

Study Of Fossils Found In Arctic Shows Plants More Developed At Earlier Time

Date:
June 7, 2002
Source:
University Of North Carolina At Chapel Hill
Summary:
Along with Canadian colleagues, a University of North Carolina at Chapel Hill scientist has discovered fossils of plants dating back some 420 million years. The discovery, made on Bathurst Island in the Northwest Territories about 800 miles from the North Pole, shows vascular plants were more complex at that time than paleontologists previously believed and is significant for that reason, the UNC researcher said.

CHAPEL HILL – Along with Canadian colleagues, a University of North Carolina at Chapel Hill scientist has discovered fossils of plants dating back some 420 million years.

Related Articles


The discovery, made on Bathurst Island in the Northwest Territories about 800 miles from the North Pole, shows vascular plants were more complex at that time than paleontologists previously believed and is significant for that reason, the UNC researcher said.

“These are not the earliest vascular plants ever found, but they are the earliest ever found of this size, complexity and degree of diversification,” said Dr. Patricia G. Gensel, professor of biology at UNC. “They look something like medium-sized grasses, except that they branch.”

The discovery adds to the sparse record of early land plants known from North America, Gensel said. Previously, most information on ancient plants has been based on fossils from Wales, Venezuela and China.

A report about the findings appears in the June issue of the American Journal of Botany. Besides Gensel, authors are UNC graduate student Michele E. Kotyk, Dr. James F. Basinger, professor of geology at the University of Saskatchewan, and Dr. Tim A. de Freitas, a Calgary, Canada geologist working for Nexen Inc.

Bits and pieces of the earliest known land plants date back almost 500 million years to the Ordovician Period, and their fragmentary remains indicate the plants were related to liverworts that exist today, Gensel said. The earliest vascular plants -- ones with water-conducting tissues -- so far are known to date back about 425 million years. Sparsely branched, they were about an eighth of an inch tall and grew a few reproductive bodies known as sporangia on their branches.

By contrast, the new plants, which lived only a few million years later, would have stood four or more inches tall, bore many branches with dense rows of sporangia and probably grew in clusters, she said. They more closely resembled much younger early Devonian plants from about 390 million years ago than any other Silurian forms.

“We found these previously unknown plants in rocky sediments we collected and brought back first by helicopter and then airplane from Bathurst in 1994,” the biologist said. “Because of permafrost, digging is impossible, and we picked them up and chipped them out from exposed slopes on the almost completely barren island. Although we worked in July, some days it stayed near freezing all day long. When these plants were alive this land lay near the equator.”

The team dated specimens by finding them in the same layers as several tiny invertebrate fossilized animals such as graptolites, which under the microscope resemble band saw blades, and conodonts, which resemble miniature jaws and teeth and represent the mouthparts of primitive vertebrates. Such animal remains are excellent index fossils – fossils that indicate time.

“We conclude that the Bathurst Island flora presents the best evidence to date of substantial diversity of form, complexity and stature of vascular plants in this period,” Gensel said.

In 1996, she and colleagues in Virginia and Northern Ireland reported finding fossils of scorpions, millipedes and related arthropods dating back almost 400 million years. Those creatures, which predated dinosaurs and other reptiles by some 50 million to 100 million years, were the largest animals ever found on land up to that time in North America.

“Much of science is devoted to understanding and curing diseases, and that’s as it should be,” Gensel said. “However, we also need to understand where living things have come from, which we can do by studying fossils. That gives us a better perspective on why the Earth and life are as they are today.”


Story Source:

The above story is based on materials provided by University Of North Carolina At Chapel Hill. Note: Materials may be edited for content and length.


Cite This Page:

University Of North Carolina At Chapel Hill. "Study Of Fossils Found In Arctic Shows Plants More Developed At Earlier Time." ScienceDaily. ScienceDaily, 7 June 2002. <www.sciencedaily.com/releases/2002/06/020607072227.htm>.
University Of North Carolina At Chapel Hill. (2002, June 7). Study Of Fossils Found In Arctic Shows Plants More Developed At Earlier Time. ScienceDaily. Retrieved January 26, 2015 from www.sciencedaily.com/releases/2002/06/020607072227.htm
University Of North Carolina At Chapel Hill. "Study Of Fossils Found In Arctic Shows Plants More Developed At Earlier Time." ScienceDaily. www.sciencedaily.com/releases/2002/06/020607072227.htm (accessed January 26, 2015).

Share This


More From ScienceDaily



More Fossils & Ruins News

Monday, January 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

India Clears Cows, Dogs, Dust for Obama Taj Mahal Trip

India Clears Cows, Dogs, Dust for Obama Taj Mahal Trip

AFP (Jan. 23, 2015) Preparations are under way at the Taj Mahal ahead of a visit by Barack and Michelle Obama. Duration: 01:11 Video provided by AFP
Powered by NewsLook.com
Lincoln Collection to Be Auctioned in Dallas

Lincoln Collection to Be Auctioned in Dallas

AP (Jan. 23, 2015) Hundreds of pieces of Lincoln memorabilia collected by a Fort Worth, Texas businessman are set to be auctioned this weekend. (Jan. 23) Video provided by AP
Powered by NewsLook.com
Phones Used 100 Years Ago on Display

Phones Used 100 Years Ago on Display

AP (Jan. 22, 2015) The phones used to make the world&apos;s first coast-to-coast conference call 100 years ago have been put on display at the California Historical Society&apos;s 1915 World&apos;s Fair exhibit space in San Francisco. (Jan. 22) Video provided by AP
Powered by NewsLook.com
King Tutankhamun Burial Mask Sloppily Glued Back Together After Cleaning Mishap

King Tutankhamun Burial Mask Sloppily Glued Back Together After Cleaning Mishap

Buzz60 (Jan. 22, 2015) King Tutankhamun Burial Mask is now being called &apos;irreversibly damaged&apos; after its famous beard broke off in a botched cleaning job and then was hastily glued back together. Jen Markham (@jenmarkham) has the story. Video provided by Buzz60
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:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

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