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Geotimes June 2003 Greg Peterson |
Cannibal dinosaurs During the Late Cretaceous, a predatory dinosaur named Majungatholus atopus roamed the plains of what is now northwestern Madagascar. A study in the April 3 Nature now suggests that when times got tough, and food sources became scarce, the dinosaur turned to its own kind for a meal. |
Geotimes June 2003 Sara Pratt |
Amazon's ancient rain forest Paleoclimatologists have often suggested that the Amazon Basin was an arid savanna during the Pleistocene about 2 million years ago. Now, researchers have found that lowland tropical rainforest likely dominated the region at that time, just as it does today. |
Geotimes May 2003 Greg Peterson |
Mayan drought Geological studies of sediment show that from 750 to 950 A.D., a time when the Classic Maya civilization collapsed, the Cariaco Basin region suffered a century-long dry period, punctuated by four major droughts, adding strain to the disintegrating empire. |
Geotimes April 2003 Dave Lawrence |
Microfossil lineages support sloshy snowball Earth Whether Earth's surface was completely frozen over during the glaciations about 900 to 540 million years ago (a hardball) or experienced open water near the equator (a slushball) is up for debate. Recent research now suggests that slushball conditions were more likely. |
Geotimes April 2003 Lisa M. Pinsker |
Seeing Chicxulub A new map of the Yucatan from NASA shows for the first time the 180-kilometer wide crater left behind after a giant impact that researchers believe killed the dinosaurs 65 million years ago. |
Geotimes April 2003 |
Devonian dentistry According to standard theory, placoderms lacked true teeth. Instead, bony plates, sometimes razor-edged and self-sharpening, lined their jaws and captured dinner. A study in the Feb. 21 Science turns this view on its head, indicating that an advanced group of placoderms, called Arthrodira, did have teeth. |
Reason February 2003 Charles Paul Freund |
Artifact: Loot Box This plain-looking limestone box carries the Aramaic inscription, "James, son of Joseph, brother of Jesus." The 20-inch-long box, which once held bones, appears to date from the first century A.D., and may well refer to Jesus of Nazareth. |
Reason December 2002 Brian Doherty |
Bones of Contention Free Kennewick Man!: An August decision by a federal magistrate in Oregon means a victory for scientific research over tribal identity politics. |
Science News November 23, 2002 Ivars Peterson |
Ancient Infinities An ancient manuscript long hidden from public view has provided significant, new insights into the way Archimedes did his mathematical work more than 2,000 years ago. |
Outside October 2002 Bill Vaughn |
The Snow on the Sweetgrass For newcomers -- meaning most of us -- they are merely picturesque. But for Native Americans, the sacred places of the Great Plains and Northern Rockies are alive with centuries of memory and meaning -- and something much, much bigger. |
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