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Geotimes
February 2004
Sara Pratt |
Fire cooks rock clocks A new field study has confirmed what models had previously predicted: The intense heat of wildfires can reset the helium "clock" in rocks, making them appear younger than they are.   |
Geotimes
February 2006
Megan Sever |
Carving on Glacial Time A new technique for calculating the rate in which glaciers and rivers erode the landscape is shedding light on the timing of these glacial processes. |
Geotimes
April 2005
Peter A. Scholle |
Geologic Etiquette in a Mechanized Era Geologists should exercise more considerate choices regarding the rocks they destroy for science. |
Geotimes
March 2005
Sara Pratt |
Rocky Debate Over Early Life Scientists fail to replicate a 1996 study on 3.85-billion-year-old rocks that pushed back the date of the earliest evidence for life on Earth by several hundred million years. |
Geotimes
November 2005
Megan Sever |
New Appalachian Tale New research indicates that conventional thinking about the timing of the building of the Appalachian Mountains may be incorrect. |
Geotimes
September 2003
Sara Pratt |
Zircons reveal mantle evolution A team of Finnish geologists has discovered 3.1 billion-year-old zircons in the Jormua ophiolite of eastern Finland. Although not the oldest zircons on Earth, the Jormua zircons are the oldest yet found in mantle rocks. Their discovery has given scientists a brief glimpse into the history of early plate tectonics. |
Geotimes
November 2005
Kathryn Hansen |
Earthly Origin for Desert Formation The Richat Structure in the Maur Adrar Desert is frequently photographed from space. The formation resembles an impact crater, but researchers now say that the famous feature may be the result of magma fluids dissolving sedimentary rocks about 100 million years ago. |
Geotimes
January 2005
Naomi Lubick |
Grand Canyon Floods On Nov. 21, the Department of the Interior approved a release of water from the Glen Canyon Dam in an attempt to rebuild the beaches and other sedimentary environments. |
Geotimes
December 2003
Megan Sever |
La Nina controls Amazon floodplain A team of geologists linked the floodplain depositional layers to rapidly rising floods that occur during La Nina events in Bolivia. Rather than corresponding to annual flooding events in the rainforests, each large sediment influx corresponded to a La Nina event in the historic record. |
Geotimes
July 2003
Josh Chamot |
Jumbled Missouri geology linked to impact Combining a good bit of geologic sleuthing with a fortunate twist, Kevin Evans and colleagues at Southwest Missouri State University have uncovered what may be the fifth-largest impact structure in the United States. |
Geotimes
September 2004
Sarah Todd Davidson |
The Center of it All: Visiting Central Park New York's Central Park presents a treasure trove of important geologic information. |
High on Adventure
October 2000
Larry Turner |
Spires, Hoodoos, Breaks, and Dunes Though my heart was racing, I marveled at the extraordinary views of the Zion Narrows. The spectacular gorge runs for l6 miles within southwest Utah's Zion National Park. Exploring within the shadows and light of its lofty walls, sandstone grottos, hanging gardens, and natural springs is an unforgettable wilderness adventure experience... |
Geotimes
May 2004
Swarzenski & Campbell |
Tracking Contaminants Down the Mississippi The U.S. Geological Survey is working with scientists from various universities and state agencies to investigate the historic downstream delivery of sediment-associated contaminants into the Gulf of Mexico. |
