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:7/31/2014)... A hidden hazard lurks beneath many of the ... , The hazard is corrosion in parts of ... failures, leaks and contamination of groundwater, a source ... in nine states have reported many rapidly corroding ... These incidents are generally associated with use of ...
(Date:7/31/2014)... German . , ... a sponge that soaks up liquids. Hence, these highly ... gases. However, loading of many MOFs is inhibited by ... report in Nature Communications that the barriers ... can be prevented by water-free synthesis and storing strategies. ...
(Date:7/31/2014)... Prolonged exposure to loud noise alters how the ... distinguishing speech sounds, according to neuroscientists at The ... paper published this week in Ear and ... how noise-induced hearing loss affects the brain,s recognition ... reaches all corners of the population, affecting an ...
Breaking Biology News(10 mins):NIST corrosion lab tests suggest need for underground gas tank retrofits 2Free pores for molecule transport 2UT Dallas study reveals effect of loud noises on brain 2
(Date:8/1/2014)... As one of the 10 largest medical ... & Clinical Lab Expo is the place where breakthrough ... to the healthcare world. This year, many of the ... include the latest diagnostic technology in the field of ... biosensors have enabled the development of "labs-on-a-chip" that can ...
(Date:8/1/2014)... , Aug. 1, 2014 Research ... "Global Single Nucleotide Polymorphism (SNP) Genotyping and Analysis ... http://photos.prnewswire.com/prnh/20130307/600769 Single Nucleotide ... genetic variations of SNPs in the genome of various ... humans. SNP genotyping and analysis technology can analyze thousands ...
(Date:8/1/2014)... ON (PRWEB) August 01, 2014 ... has led to a better understanding embryonic development. ... and reorganize into structurally and functionally distinct tissues ... physical defects. Prof. Todd McDevitt, Melissa Kinney, ... biophysical signals interact with biochemical cues to control ...
(Date:7/31/2014)... not donor candidates for bone marrow transplantation. The immune ... prone to life-threatening infection and other maladies, and a ... reason why. , "We have found the cellular mechanism ... blood production over time in an old organism, and ... rejuvenation therapies," said Emmanuelle Passegu, PhD, a professor of ...
Breaking Biology Technology:Lab-on-a-Chip Technology to Be Featured at 2014 AACC Annual Meeting & Clinical Lab Expo 2Lab-on-a-Chip Technology to Be Featured at 2014 AACC Annual Meeting & Clinical Lab Expo 3Global Single Nucleotide Polymorphism (SNP) Genotyping and Analysis Market 2014-2018 2Study Links Biomechanics and Gene Expression in Stem Cells 2Key to aging immune system is discovered 2
Cached News: