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:4/2/2015)... At its 2015 ACMG Annual Clinical Genetics ... the American College of Medical Genetics and Genomics (ACMG) ... Board.  Members of the ACMG Board of Directors serve ... advancing its policies and programs. ACMG is the national ... an eventful time in medical genetics and genomics.  We ...
(Date:3/31/2015)...  Elephant Talk Communications Corp. (NYSE MKT: ETAK) ("Elephant ... Defined Network Architecture (ET Software DNA® 2.0) platforms and ... $20.4 million for the year ended December 31, 2014 ... year ended December 31, 2013. At ... its multi-year transition away from its legacy landline business ...
(Date:3/24/2015)... Markets ( http://www.researchandmarkets.com/research/kvdtcw/face_and_voice ) has announced the addition of ... report to their offering. This report analyzes the ... the following Segments: Face Biometrics, and Voice Biometrics. The report provides ... Japan , Europe , ... Africa , and Latin America ...
Breaking Biology News(10 mins):American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 2American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 3American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 4American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 5American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 6American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 7American College of Medical Genetics and Genomics Announces New Board Members: Dr. Louanne Hudgins is ACMG President-Elect 8Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 2Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 3Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 4Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 5Elephant Talk Reports 2014 Fourth Quarter and Year End Financial Results 6Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 3Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 4Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 5Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 6
(Date:4/24/2015)... California (PRWEB) April 24, 2015 ... key milestones in its allogeneic stem-cell product development ... to properly reflect the corporate strategic direction. , ... allogeneic (donor) adipose stem cell development program has ... of our cGMP manufacturing facility and hiring of ...
(Date:4/24/2015)... MINNEAPOLIS, MN , April 24, 2015 /PRNewswire/ ... chosen by Bayer MaterialScience as the supplier of ... of innovative, bio-based polyurethanes for textile applications that ... Bayer MaterialScience has launched IMPRANIL ® eco, ... renewable content that reaches as high as 65%.  ...
(Date:4/24/2015)... MONTREAL , April 24, 2015 /CNW Telbec/ - Mirego, ... part of the making of three mobile app extensions for ... for its clients, Familiprix, OMSignal and MediaMiser, these ... information thanks to functions designed specifically for wrist use.  ... the Apple Watch is a highly customizable tactile smartwatch that ...
(Date:4/24/2015)... 2015 PAREXEL International Corporation (NASDAQ: ... announced that Partnerships in Clinical Trials named PAREXEL,s ... Clinical Innovator of the Year.  The honor recognizes Mr. ... Company,s Perceptive MyTrials ® Data-Driven Monitoring solution. ... the 2015 Partnership Awards in Boston ...
Breaking Biology Technology:Vet-Stem, Inc. Meets New Milestones and Changes Name to VetStem Biopharma 2Bayer MaterialScience Names BioAmber As Its Supplier For New Product Line - Bio-succinic acid forms backbone of innovative new bio-based polyurethanes for textiles 2Bayer MaterialScience Names BioAmber As Its Supplier For New Product Line - Bio-succinic acid forms backbone of innovative new bio-based polyurethanes for textiles 3Bayer MaterialScience Names BioAmber As Its Supplier For New Product Line - Bio-succinic acid forms backbone of innovative new bio-based polyurethanes for textiles 4Familiprix, OMSignal and MediaMiser apps available today for Apple Watch 2PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 2PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 3PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 4PAREXEL Honored With 2015 Clinical Innovator Of The Year Award From Partnerships In Clinical Trials 5
Cached News: