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:


(Date:12/7/2016)... 2016   Veridium , a leader in ... new CEO James Stickland . Stickland, a ... experience, has served in senior executive roles for ... in expanding a pipeline of venture capital and ... recently served as managing director of U.K.-based fintech ...
(Date:12/2/2016)... , December 1, 2016 ... (Fingerprint, Voice), Future Technology (Iris Recognition System), Vehicle ... - Global Forecast to 2021", published by MarketsandMarkets, ... Million in 2016, and is projected to grow ... CAGR of 14.06%.      (Logo: http://photos.prnewswire.com/prnh/20160303/792302) ...
(Date:11/29/2016)... Nov. 29, 2016   Neurotechnology , ... object recognition technologies, today released FingerCell 3.0, ... recognition solutions that run on low-power, low-memory ... using less than 128KB of memory, enabling ... that have limited on-board resources, such as: ...
Breaking Biology News(10 mins):
(Date:12/8/2016)... Eurofins announces the appointment of Sean Murray , ... Inc. (ESI). Mr. Murray will bring valuable expertise ... experience in leading international business teams. As the National Division Leader, ... uphold Eurofins, status as the global leader in bio-analytical testing services. ... , , ...
(Date:12/8/2016)... England , December 8, 2016 ... has expanded its customisable SureSeqâ„¢ NGS panel range with the ... allowing fast and cost-effective study of variants in familial hypercholesterolemia ... number variation (CNV) detection on a single small panel and ... hotspot content. This includes all exons for LDLR , ...
(Date:12/8/2016)... (PRWEB) , ... December 08, 2016 , ... ... finalists in the World Technology Awards. uBiome is one of just six company ... all categories. , In addition to uBiome, companies nominated as finalists in this ...
(Date:12/8/2016)... Fla. , Dec. 8, 2016  HedgePath ... company that discovers, develops and plans to commercialize ... its shares of common stock were approved for ... will begin trading on the OTCQX, effective today, ... qualify for the OTCQX market, companies must meet ...
Breaking Biology Technology:
Cached News: