Featured Research

from universities, journals, and other organizations

Discovery Of Oldest Dinosaur Bones Reported In Science

Date:
October 22, 1999
Source:
University Of California, Santa Barbara
Summary:
A team of paleontologists has discovered jaws from two of the oldest dinosaurs ever discovered, and the remains of eight other prehistoric animals, in a rich bed of fossils in Madagascar, providing a 'time capsule' from the earliest days of dinosaurs and mammals and illuminating scientific understanding of the mid-late Triassic Period.

A team of paleontologists has discovered jaws from two of the oldest dinosaurs ever discovered, and the remains of eight other prehistoric animals, in a rich bed of fossils in Madagascar, providing a 'time capsule' from the earliest days of dinosaurs and mammals and illuminating scientific understanding of the mid-late Triassic Period. The findings are reported in the October 22 issue of Science.

Related Articles


"We have discovered a spectacular new fauna of this age in southwest Madagascar," said Andre Wyss, associate professor of geology at the University of California, Santa Barbara, and co-leader of the research team. "It includes the fragmentary remains of two plant eating dinosaurs, prosauropods, about the size of a new-born calf, which are not only the earliest dinosaurs known from the island, but probably the earliest dinosaurs known from anywhere in the world."

"This fauna also includes spectacular, close mammal relatives -- mammal-like reptiles," said Wyss. "These are the first fossils of their kind known from Madagascar. Their preservation is superb, rivaling that of anything in the world."

This discovery is just the tip of the iceberg, according to Wyss. "A wealth of bones is pouring out of our quarries," he said. "Once these get cleaned up, we have no doubt that we'll know a great deal more about all of these animals, plus many others. There should be meat-eating dinosaurs present, as well as a host of other novel animals."

To establish the relative ages, scientists must look to what other kinds of fossils are found in association with the dinosaurs. "The Malagasy finding is unique in containing various kinds of animals -- such as certain non-dinosaurian reptiles and mammal relatives -- found elsewhere only in more ancient deposits, and thus lacking dinosaurs," said Wyss.

"Also, the Malagasy fauna lacks other, presumably younger, forms usually found alongside the earliest dinosaurs," he said. "The co-occurrence of dinosaurs and these more ancient kinds of animals -- as well as the non-occurrence of younger groups -- argues for the antiquity of the dinosaurs in this deposit."

Wyss explained that of the various early dinosaur sites known worldwide, it has been possible to directly date, by radioisotopic means, only one of them, the one from Argentina, which is roughly 227 million years old. "Our Malagasy fauna and its dinosaurs are possibly as much as 5 million years older, but all that we can say at this point is that all indications point to its being distinctly older than 227," he said.

The fossils are from a period that has long been a puzzle for paleontologists, the Middle to Late Triassic (225 to 230 million years ago.) At the opening of this period, a variety of reptiles, amphibians, and other vertebrates populated the land. By its close, early dinosaurs and mammals had appeared, but a sparse fossil record has left scientists with few clues about what happened in between.

The prosauropods, herbivores with small heads and long necks, could walk on two or four legs. These primitive dinosaurs either shared a common ancestor with, or were themselves ancestors to, the mighty sauropod dinosaurs that evolved later, such as Apatosaurus.

The five pre-mammalian animals that the researchers discovered should also shed light on the currently murky picture of the origins of the first true mammals. For example, an essential question is how this line of large, cold-blooded 'mammal-like' reptiles evolved into small warm blooded mammals, many of which then evolved to much larger sizes once again, following the extinction of the dinosaurs.

The paleontologists also expect that their find will provide clues about how the breakup of the supercontinent Pangaea, which began in the Triassic, affected the course of evolution.

"There were critical evolutionary events occurring in the Triassic, in response to climate changes and the beginning of the break-up of the supercontinent Pangaea, but we haven't had a good record of them until now," said J. J. Flynn of the Field Museum in Chicago.

The fossils were discovered by John Flynn, of the Field Museum in Chicago, J. Michael Parrish, of the Northern Illinois University, Berthe Rakotosamimanana, of the Universite d'Antananarivo in Madagascar, William Simpson of the Field Museum, and Robin Whatley and Andre Wyss, of the University of California, Santa Barbara.


Story Source:

The above story is based on materials provided by University Of California, Santa Barbara. Note: Materials may be edited for content and length.


Cite This Page:

University Of California, Santa Barbara. "Discovery Of Oldest Dinosaur Bones Reported In Science." ScienceDaily. ScienceDaily, 22 October 1999. <www.sciencedaily.com/releases/1999/10/991022005700.htm>.
University Of California, Santa Barbara. (1999, October 22). Discovery Of Oldest Dinosaur Bones Reported In Science. ScienceDaily. Retrieved March 5, 2015 from www.sciencedaily.com/releases/1999/10/991022005700.htm
University Of California, Santa Barbara. "Discovery Of Oldest Dinosaur Bones Reported In Science." ScienceDaily. www.sciencedaily.com/releases/1999/10/991022005700.htm (accessed March 5, 2015).

Share This


More From ScienceDaily



More Fossils & Ruins News

Thursday, March 5, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

What An Ancient Jawbone Could Tell Us About Human Evolution

What An Ancient Jawbone Could Tell Us About Human Evolution

Newsy (Mar. 5, 2015) A 2.8 million-year-old jawbone could represent the most ancient member of our genus ever discovered. Video provided by Newsy
Powered by NewsLook.com
Ringling Bros. Eliminating Elephant Acts

Ringling Bros. Eliminating Elephant Acts

AP (Mar. 5, 2015) The Ringling Bros. and Barnum & Bailey Circus is ending its iconic elephant acts. The circus&apos; parent company, Feld Entertainment, told the AP exclusively that the acts will be phased out by 2018 over growing public concern about the animals. (March 5) Video provided by AP
Powered by NewsLook.com
Billionaire Paul Allen and Team Find Sunken Japanese Warship Off Philippines

Billionaire Paul Allen and Team Find Sunken Japanese Warship Off Philippines

Reuters - News Video Online (Mar. 4, 2015) A team led by Microsoft co-founder Paul Allen finds a sunken Japanese World War 2 warship off the coast of the Philippines. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Long-Lost Ship Found? Microsoft Co-Founder Uncovers Wreckage

Long-Lost Ship Found? Microsoft Co-Founder Uncovers Wreckage

Newsy (Mar. 4, 2015) Microsoft co-founder Paul Allen says he has discovered the wreckage of the battleship Musashi in the central Philippines. Video provided by Newsy
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