The Devonian Period closes with another decline and mass extinction. Again, 50 percent of species vanish world-wide, the major losses taken this time by ocean life. Basic biota body blueprints remain conservative.
Note the "bottom-heavy" trend in evolution: new lineages generate remarkable diversity when they first appear, but settle to a limited number of body plans in what paleontologist Stephen Gould calls, "early experimentation and later standardization."
It takes 30 million years for biodiversity to recover fully from this mass extinction.
University of Montana--Missoula. Environmental Studies Program
© 1997 Stiftung Drittes Millennium
Digital File Format
Digital Image Number
Liebes, Sid; Mittelstadt, Laurie; Waugh, Barbara; and Brynes, Lois, "Panel 64: Rhythms Of Life And Loss" (1997). A Walk Through Time - From Stardust To Us. 64.