The Geological Society of America

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The Geological Society of America provides access to elements that are essential to the professional growth of earth scientists at all levels of expertise and from all sectors: academic, government, business, and industry.
Cambrian origin of all skeletalized metazoan phyla--Discovery of Earth's oldest bryozoans (Upper Cambrian, southern Mexico)
E. Landing
Geology(2010), 38(6):547
http://dx.doi.org/10.1130/G30870.1

The Geological Society of America
The Geological Society of America
GeoScienceWorld
GeoScience World