Tag: "geological" at biology news

Antarctic mud reveals ancient evidence of global climate change

...ast 7,000 years," says Robert Dunbar, professor of geological and environmental sciences at Stanford. "The cause...n international project dedicated to exploring the geological history and evolution of the Earth. ODP is principally funded by the National Science Foundation wit...

Inherent speed limit governs how quickly life bounces back after extinction, UC Berkeley research shows

...ates are about equally variable over long spans of geological time. Over shorter periods, however, diversification rates vary much less than extinction rates do. That means that evolution doesn't accelerate quickly in response to rapid bursts of extinction. One possible explanation for why diversification takes...

Evolutionary 'speed limit' governs how quickly life bounces back after extinction

...rates are aboutequally variable over long spans of geological time. Overshorter periods, however, diversification rates vary much lessthan extinction rates do. That means that evolution doesn'taccelerate quickly in response to rapid bursts of extinction. One possible explanation for why diversification t...

January media highlights: GEOLOGY and GSA TODAY

...on brings to the fore mapping data for a 2000-mile geological structure--the Tongareva triple junction--in the s...ragansett, Rhode Island 02882, USA. Pages 67-70. A geological structure called the "Tongareva triple junction" has been mapped for the first time across more than...

January media highlights-GSA Bulletin

...area, has implications on the understanding of the geological evolution of western North America....

Ancient supernova may have triggered eco-catastrophe

...ed searches for supernova-produced isotopes in the geological record would show whether there was a tight temporal correspondence between the supernova explosion and the extinction event. Isotope searches could also offer crucial information about the physical processes involved in supernova explosions. People ...

UMass researchers find environment on Earth that mimics Mars geochemically and supports ancient life form

...ose as we have come to finding life on Earth under geological conditions most like those expected below the surf...e the Idaho site for the study because it provided geological conditions most like those expected on Mars. The water deep within these volcanic rocks has been iso...

The K-T impact extinctions: Dust didn't do it

...or mass extinction of species that happened at the geological (K-T) boundary marked by the impact. But what me...dust particles were dispersed. Incorporating these geological observations with new theoretical work, Pope asserts that very few of the particles are of the size ...

Chemical evidence proves the old adage, Birds of a feather flock together

... said C. Page Chamberlain, a Stanford professor of geological and environmental sciences and co-author of the Science paper. It is unclear, however, whether these loses are due to problems in their breeding grounds in the north or their wintering habitat in the Caribbean. According to the National Audubon Soc...

UCLA scientists, colleagues substantiate biological origin of earliest fossils

..., including the oldest specimens reported from the geological record. There is no question at all that we have s...no non-biological organic matter is known from the geological record. In science, facts always prevail, and the facts here are quite clear. In addition to being a...

UCLA to host free symposium April 5 on extinctions in Earths history

...t was the most severe mass extinction known in the geological record. David Jablonski, Department of Geophysica...of evolution. Among other subjects, he has studied geological issues related to climate and sea level change, fossils, and patterns of evolution in marine animals...

April GEOLOGY and GSA TODAY media highlights

...his marine transgression has profound societal and geological implications and thus calls for new studies and th... of volcanism directly determined by examining the geological record. Despite decades of work on volcanism and other areas, there are still many unanswered questi...

Iron-rich soil can help remove lead; manganese also important

... animals. S. Erin O'Reilly, a doctoral student in geological sciences at Virginia Tech is examining the lead sorption efficiency of several manganese (Mn) and iron (Fe) oxides. The aim is to clarify the understanding of which phases of Mn and Fe and which mineral properties of those phases are most influential...

Changes in agricultural practices help clean up Lake Erie

...rivers, Peter Whiting, CWRU associate professor of geological sciences, and Doug Moog, CWRU senior research associate, found that cropland remains the biggest contributor to sediment and pollution that flow into Lake Erie. They reported their findings in the Journal of Environmental Quality. The geologists ex...

May media highlights: GEOLOGY and GSA TODAY

...eories in earth sciences and it has explained many geological features by the interactions of tectonic plates. No theory, however, predicts the number, size or shapes of the plates and how they influence mantle convection. If the plate tectonic system is a self-organized system, receiving heat and matter from t...

Expedition to explore remarkable deep-sea mountain

...ute (MBARI), scientists expect both biological and geological surprises. They will use a remotely operated vehic...creatures found on and around the seamount, taking geological samples and mapping the 40-kilometer (25-mile) long seamount. What they discover will be available t...

Ocean ecosystems only altered following two great mass extinctions

... Realm," by Richard Bambach, professor emeritus of geological sciences from Virginia Tech; Andrew H. Knoll of Harvard, and the late J. John Sepkoski Jr. of the University of Chicago, reports and analyzes evidence that only two of these mass extinctions led to major change in global ecosystem structure. These we...

Cosmic impacts implicated in both the rise and fall of dinosaurs

... of "space dust" in the earth's crust are building geological evidence that comets or asteroids colliding with e...rker to help identify the boundary location in the geological record. "Our research adds to the speculation that there was a comet or asteroid impact about 200...

New research questions evidence for earliest life on earth

WASHINGTON - New geological and geochemical data call into question recent claims for fossil life on Earth greater than 3.8 billion years ago, say researchers from The George Washington University and the Swedish Museum of Natural History in the May 24 issue of the journal Scie...

Science editor explores the role of environmental change on global security

...are marginal at best, he explained. Kennedy cited geological analyses of ice cores from Greenland and various sediment records dating back thousands of years. The data revealed that, in the recent past, the Earth experienced periods of extreme climate change during which average temperatures rose and fell as m...

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