Article: Ancient animals got a rise out of oxygen. (Carboniferous period invertebrates)

Carboniferous period.
The Columbia Encyclopedia, 6th ed.;  January 1, 2000 ;     700+ words ...Carboniferous period , fifth period of the Paleozoic ... Historical Geology of the Period The Carboniferous period was marked by vast, coal ... independent period. The Lower Carboniferous Period In the Lower Carboniferous ...

Article: Carboniferous period
The Columbia Encyclopedia, Sixth Edition;      700+ words ...Carboniferous period , fifth period of the Paleozoic ... Historical Geology of the Period The Carboniferous period was marked by vast, coal ... independent period. The Lower Carboniferous Period In the Lower Carboniferous ...

Carboniferous period.(Reference Source)
The Columbia Encyclopedia, 6th ed.;  January 1, 1993 ;     700+ words ... ... gt; Carboniferous period k ä rb ... 350 to 290 million years ago. The Carboniferous period was marked by vast, coal-forming ...

Article: Finds undermine dating of early land life.(new research dates ...
Science News;  August 9, 1997 ;     700+ words ... ... during the Devonian, says Hartz. Instead, the findings match Greenland's position during the subsequent, Carboniferous period. Direct dating of the radioactive elements in the rocks confirmed this younger age. Using the argon-40 ...

Article: Traffic Planet: life in the second carboniferous ...
World Watch;  July 1, 2007 ;     402 words ...Right: Dacca dust-up--rush hour in the capital of Bangladesh. [ILLUSTRATION OMITTED] Below: Where the rubber meets the road--a motorway somewhere in the United Kingdom. [ILLUSTRATION OMITTED] The Dutch solution: bicycles parked in Amsterdam. [ILLUSTRATION OMITTED] Traffic to Asia, traffic to

Article: Changes in the air: variations in atmospheric oxygen have ...
Science News;  December 17, 2005 ;     700+ words ... ... world at the end of the Carboniferous period, about 300 million ... atmospheric concentration of oxygen then probably was about ... steadily as atmospheric oxygen gradually increased ... million-year-long Carboniferous period. In laboratory experiments ... insects raised in ...

Article: Portraits in carbon: forget oxygen--carbon may be the most ...
World Watch;  January 1, 2007 ;     700+ words ... ... this was formed during the aptly named Carboniferous Period, a part of the Paleozoic Era from 354 ... swamps intermittently and cutting off the oxygen that would otherwise fuel organic decay ... Atmospheric carbon likes to run with pairs of oxygen atoms like some celebrity with arms ...