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:2/25/2015)... 25, 2015  ABC Financial Services (ABC), the ... Health and Fitness Industry, today announced enhancements to ... The latest upgrade includes advances to the agreement ... check-in via Identity One fingerprint biometrics. The features ... interactive displays at the International Health, Racquet & ...
(Date:2/24/2015)... This report analyzes the worldwide markets for Iris ... for the US, Canada , ... Asia-Pacific , Middle East , and ... are provided for the period 2013 through 2020. Also, a ... and analytics are derived from primary and secondary research. Company ...
(Date:2/24/2015)... report analyzes the worldwide markets for Face and Voice Biometrics in ... The report provides separate comprehensive analytics for the US, ... , Asia-Pacific , Middle East ... Latin America . Annual estimates and forecasts are provided for ... provided for these markets. Market data and analytics are derived from ...
Breaking Biology News(10 mins):ABC Financial Unveils New Software Enhancements 2ABC Financial Unveils New Software Enhancements 3World Iris Biometrics Industry 2World Iris Biometrics Industry 3World Iris Biometrics Industry 4World Iris Biometrics Industry 5World Iris Biometrics Industry 6World Iris Biometrics Industry 7World Iris Biometrics Industry 8World Iris Biometrics Industry 9World Iris Biometrics Industry 10World Iris Biometrics Industry 11World Face and Voice Biometrics Industry 2World Face and Voice Biometrics Industry 3World Face and Voice Biometrics Industry 4World Face and Voice Biometrics Industry 5World Face and Voice Biometrics Industry 6World Face and Voice Biometrics Industry 7World Face and Voice Biometrics Industry 8World Face and Voice Biometrics Industry 9World Face and Voice Biometrics Industry 10World Face and Voice Biometrics Industry 11World Face and Voice Biometrics Industry 12World Face and Voice Biometrics Industry 13World Face and Voice Biometrics Industry 14World Face and Voice Biometrics Industry 15World Face and Voice Biometrics Industry 16
(Date:2/28/2015)... 2015 Increasing its efforts to resolve the ... first three episodes of The GMO TRUTH podcast on both ... as it continues its mission to discover the truth and ... phase, to “uncover the truth about the GMOs in our ... GMO Truth Podcast is an expansion of the documentary/investigative film-making ...
(Date:2/27/2015)... February 27, 2015 Immunovaccine Inc. (“Immunovaccine” ... of a fraudulent press release disseminated this morning by ... from Immunovaccine. This press release states that Immunovaccine has ... The press release did not originate from Immunovaccine ... within the press release. Please note that all ...
(Date:2/27/2015)... and SUMMERLAND, British Columbia ... (NYSE: XON ), a leader in synthetic ... to acquire  Okanagan Specialty Fruits (OSF), the pioneering ... , the world,s first non-browning apple. Through the acquisition, ... fruit that is more appetizing and convenient for consumers ...
(Date:2/27/2015)... SUNNYVALE, Calif. , Feb. 27, 2015 /PRNewswire/ ... announced that longer-term toxicology studies for its newly ... arthritis, or RA, have been completed. The results ... the U.S. Food and Drug Administration. The feedback ... completion of the ongoing first-in-human study. Additional preclinical ...
Breaking Biology Technology:The Walk a Mile Project Launches “GMO Truth” Podcast 2Immunovaccine Disclaims Hoax Press Release 2Intrexon to Acquire Okanagan Specialty Fruits 2Intrexon to Acquire Okanagan Specialty Fruits 3Intrexon to Acquire Okanagan Specialty Fruits 4Pharmacyclics Provides Clinical Update on BTK Inhibitor for Autoimmune Diseases 2Pharmacyclics Provides Clinical Update on BTK Inhibitor for Autoimmune Diseases 3
Cached News: