HOME >> BIOLOGY >> NEWS
Rise of dinosaurs in Late Triassic more gradual than once thought

Berkeley -- Fossils discovered in the oft-painted arroyos of northern New Mexico show for the first time that dinosaurs and their non-dinosaur ancestors lived side by side for tens of millions of years, disproving the notion that dinosaurs rapidly replaced their supposedly outmoded predecessors.

The fossils were excavated from the Hayden Quarry at Ghost Ranch, an area made famous through the paintings of Georgia O'Keefe, by a team of paleontologists from the University of California, Berkeley, the American Museum of Natural History and The Field Museum. The finds, including fossil bones of a new dinosaur predecessor the researchers have named Dromomeron romeri, are described in a cover story in the July 20 issue of Science.

"Up to now, paleontologists have thought that dinosaur precursors disappeared long before the dinosaurs appeared, that their ancestors probably were out-competed and replaced by dinosaurs and didn't survive," said co-author Kevin Padian, professor of integrative biology at UC Berkeley and a curator in the campus's Museum of Paleontology. "Now, the evidence shows that they may have coexisted for 15 or 20 million years or more."

According to primary authors Randall Irmis and Sterling Nesbitt, graduate students, respectively, at UC Berkeley and at New York's American Museum, the new bones provide anatomical information that tells paleontologists about the evolution of dinosaur precursors, their transition into true dinosaurs and how dinosaurs diversified.

"Finding dinosaur precursors, or basal dinosauromorphs, together with dinosaurs tells us something about the pace of changeover," Irmis said. "If there was any competition between the precursors and dinosaurs, then it was a very prolonged competition."

An alternative hypothesis held that the sudden extinction of many animals in the Late Triassic period allowed dinosaurs to diversify and eventually populate the globe. Based on the new findings, ho
'"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-642-3734
University of California - Berkeley
19-Jul-2007


Page: 1 2 3 4

Related biology news :

1. Despite their heft, many dinosaurs had surprisingly tiny genomes
2. Large dinosaurs were extremely hot in their day, UF study finds
3. Sensational find: The mini-dinosaurs from the Harz Mountains
4. Oceans may soon be more corrosive than when the dinosaurs died
5. Unexpected finding: Some dinosaurs grew slower in hard times
6. Latest study: Scientists say no evidence exists that therapod dinosaurs evolved into birds
7. Did feathered dinosaurs exist?
8. Study: Predatory dinosaurs had bird-like pulmonary system
9. Burnt coal from the age of dinosaurs sheds light on todays global warming
10. Killer dinosaurs turned vegetarian
11. Strains of laboratory mice more varied than previously thought

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Rise dinosaurs Late Triassic more gradual than once thought

(Date:8/28/2014)... million kilometres of new roads will be built worldwide ... Earth,s last wildernesses, where they bring an influx of ... an ambitious study has created a ,global roadmap, for ... balance the competing demands of development and environmental protection. ... that estimates that natural importance of ecosystems and a ...
(Date:8/28/2014)... to alert the world to Global Warming, has called ... stored underground. He says that Carbon Capture, combined with ... to avoid global warming getting out of control over ... York) made the call during his presentation to the ... are meeting to discuss Carbon Capture and Storage. ...
(Date:8/28/2014)... at Ludwig-Maximilians-Universitaet (LMU) in Munich have assigned a ... of predatory arthropods. These animals lived in shallow ... related forms found in Jurassic strata. , ... shallow marine habitat and were fossilized some 435 ... denizens of the Silurian seas although they ...
Breaking Biology News(10 mins):Study shows where on the planet new roads should and should not go 2Study shows where on the planet new roads should and should not go 3Global warming pioneer calls for CO2 to be taken from atmosphere and stored underground 2Paleontology: Oldest representative of a weird arthropod group 2
(Date:8/28/2014)... , Aug. 28, 2014  Next month, executives from clinical ... key industry events beginning with Patient-Centered Clinical Trials 2014 ... Boston , September 4-5. Patient recruitment experts ... Aaron Fleishman will share insights on the benefits ... variety of tactics – from media to mobile apps – ...
(Date:8/28/2014)... 28, 2014  Armetheon, Inc. ( www.armetheon.com ), ... to late-stage cardiovascular drug candidates, today announced that ... round of financing. The Series A round was ... with participation from investors that included Atheneos Capital ... Larry Hsu , the founder of Impax ...
(Date:8/28/2014)... 28, 2014 A new market ... world is available from Strategic Consulting, Inc., the ... Industrial Microbiology Market Review, Fourth Edition: Global Review ... (IMMR—4) tracks and compares microbiology test volumes, market ... Europe and Asia, and forecasts future volumes and ...
(Date:8/28/2014)... August 28, 2014 Supplementing their ... a promotion for Eppendorf Safe Lock Centrifuge ... purchase the highest quality tubes at an affordable ... for customers doing chemical, medical, pharmaceutical, and life ... are not regularly able to afford Eppendorf products. ...
Breaking Biology Technology:BBK Worldwide Leads Sessions at Key September Events 2Armetheon Completes $7.0 Million Series A Financing 2Armetheon Completes $7.0 Million Series A Financing 32 Billion Industrial Microbiology Tests Conducted for Product Quality and Safety Worldwide 22 Billion Industrial Microbiology Tests Conducted for Product Quality and Safety Worldwide 3Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 2Eppendorf Safe Lock Centrifuge Tube Promotion Now Available at Major Pipette Distributor Pipette.com 3
Cached News: